LS-DYNA 971R6.1.0 Release notes
Contents
1. e Modify behaviour of version command line option so that it prints additional information about when where and how the LS DYNA executable was built e Fix user defined loading USER_LOADING which was very likely to be applying the wrong forces to nodes since 162822 Ove Arup and Partners Limited August 2012 Page 13 LS DYNA Software Release Notes Version 971 R6 1 0 e Fix the warning message that we print when a rigid body has a minimum moment of inertia less that 1 500 of the maximum moment of inertia so that the message will not contradict the numbers that we print The behaviour of rigid bodies is unchanged by this fix e Fix the part mass and total mass reported to the d3hsp file for plane strain shell ELFORMs 13 and 43 The sections are assumed to have a thickness of 1 0 but if the user gave thickness values on the SECTION_SHELL card they were used in the part mass calculation e Add new capability in small restart to allow repositioning of parts This is accomplished by including DEFINE_TRANSFORMATION and NODE_TRANSFORM in the small restart deck to move nodes of a specified node set prior to continuing the simulation Ove Arup and Partners Limited August 2012 Page 142. Fix MPP decomposition error for LOAD_BODY_GENERALIZED that could result in these forces being applied incorrectly in some cases Fix bug in LOAD_BODY_POROUS The check for wedge and tetra elements was incorrect MAT Fix incorrect plastic behaviour of discrete beam with MAT_NONLINEAR_PLASTIC_DISCRETE BEAM Improve the compression elimination algorithm for 2D seatbelts CSE 2 in MAT_SEATBELT Suppress the detailed material failure MAT_ADD_EROSION messages in messag and d3hsp when number of messages gt MSGMAX Ove Arup and Partners Limited August 2012 Page 9 LS DYNA Software Release Notes Version 971 R6 1 0 e Fix segmentation fault problem when MAT_SIMPLIFIED_RUBBER FOAM_WITH_FAILURE MAT_181 is used with PART_COMPOSITE as the first integration point e Fix incorrect stresses when using MAT_PSEUDO_TENSOR MAT_016 with fully integrated S R solid type 2 e Implement consistency ncpu lt 0 for SMP for MAT_COHESIVE_GENERAL MAT_186 solids and shells e Allow viscoelastic model in MAT_077_O to use up to twelve terms in Prony series instead of standard six e Correct energy calculation in MAT_PML_NULL MAT_246 to match that in MAT_NULL e Fix bug for MAT_OGDEN_RUBBER and MAT_HYPERELASTIC_RUBBER MAT_077 Initialization of number of history variables was not correct when G 0 or SIGF 0 and Prony terms were used for solid elements e Fix MAT MODIFIED PIECEWISE LINEAR PLASTICITY MAT_123 align
3. behaviour of tetrahedral formulation 13 with other solid elements e Fix for GISSMO damage in MAT_ADD_EROSION to allow large curve IDs and correct element id e Fix INITIAL_ FOAM REFERENCE GEOMETRY for shell materials MAT_027 and MAT_ 181 e Add error message for MAT_187 with more than 12 curves in table LCID T e Enable large curve ID s for friction table CONTACT_ with FS 2 e Speed up of GISSMO damage in MAT_ADD_EROSION damage growth is now only calculated for elements with plastic strain increment gt 0 others don t need it e Fix for shell materials MAT_123 and MAT_ 124 load curve bounds to avoid error termination in very rare cases e Fix for shell material MAT_224 Strain rate dependent failure input curve LCG was not working correctly rate was always zero Solids were OK e Fix for MAT_240 Set limits for yield stresses T and S to ensure validity of the material model and to avoid unwanted error termination e Fix for MAT_136 It was only working for first part in keyword input e Change the formability limit in MAT_036_NLP from 1 to 1 5 per customer request e MAT_ADD_PERMEABILITY_ORTHOTROPIC is now available for pore pressure analysis _ PORE FLUID e Fix bug in which MAT_ADD_EROSION did not work for the following materials for solid elements when VP 1 MAT_003 015 018 019 _024 064 065 Ove Arup and Partners Limited August 2012 Page 10 LS DYNA Software Release Notes Ve
4. includes CONTACT_AUTOMATIC_ _TIEBREAK e Fix for MPP improperly generating node numbers for display of geometric contact entities when running problems with adaptivity CONTACT_ENTITY CONTROL_ADAPTIVE e Fix for deep penetration past shell centerline problem in MPP single surface contacts in the case where IGNORE 1 is turned on Also fix rare case of migrating nodes that could get dropped from contact e Fix MPP so contact segments from TSHELL elements are deleted when the elements fail e Fix bug resulting in divergence between the location of CONTACT_ENTITY and the associated rigid body if the rigid body had prescribed motion e MPP tied contact if someone puts soft 2 on a tied contact definition silently switch it to soft 1 Soft 2 makes no sense for these contacts and was confusing the input processing e Add new option SPOTSTP 3 in CONTROL_CONTACT to retain spot welds even though the welds were not found in the CONTACT_SPOTWELD e Fix MPP implementation of CONTACT_ ORTHO_FRICTION e Fix MPP groupable CONTACT_TIED_ energy calculations The contact was working correctly but the energy calculation was incorrect since the changes of r71470 e Fix MPP problem of contact not properly honouring the I2D3D parameter on Optional Card B of CONTACT_ e Fix possible floating point exception affecting DEFINE_FRICTION_ORIENTATION e FTIED 1 in CONTROL_PORE_FLUID allows the pore fluid to flow through tie
5. is now applicable to thermal data If NPOPT 1 then suppress printing of the following input data to d3hsp e INITIAL_TEMPERATURE BOUNDARY_TEMPERATURE BOUNDARY_FLUX BOUNDARY_CONVECTION BOUNDARY_RADIATION BOUNDARY_ENCLOSURE_RADIATION Added beam energy balance information to TPRINT file MPP e Fix problem of temporary decomposition files occasionally being deleted prematurely e LS DYNA and Madymo are now properly coupled in MPP resulting in significant improvement in performance MAT_RIGID Forming e Fix bug in contact search for CONTACT_FORMING_SURFACE_TO_SURFACE to resolve reliability issues when performing implicit analysis for gravity loading e Improvements to shell adaptivity CONTROL_ADAPTIVITY to reduce the number of elements along curved areas in forming simulations e Improve one step unfolding CONTROL_FORMING_ONESTEP to accommodate blanks with small initial holes Ove Arup and Partners Limited August 2012 Page 12 LS DYNA Software Release Notes Version 971 R6 1 0 Isogeometric Elements e Fix B matrix bug for FORM 4 isogeometric shell ELEMENT_SHELL_NURBS_PATCH e Sped up the FORM 3 isogeometric shell and made storage consistent with other FORMs Miscellaneous e Correct a bug that occurs when DEFINE_VECTOR in an input file included via INCLUDE_TRANSFORM has a non zero coordinate system CID e Speed up the processing of SET_XXXX_GENERAL whenre XXXX could be any element type like s
6. SMP Control the number of messages for deleted and failed elements by MSGMAX in CONTROL_OUTPUT Fix bug in writing binary plot file d3ssd DATABASE_FREQUENCY_BINARY_D3SSD Implement ASCII database nodfor for nodal and resultant force for nodes defined in DATABASE_NODAL_FORCE_GROUP in FREQUENCY_DOMAIN_SSD analysis SMP only for now Fix bug in writing frequency binary plot files in MPP Don t reset d3dump interval in small deck restart if in fact the user did not input a new value DATABASE_BINARY_D3DUMP Fix bug in MPP where frictional contact energy was not computed and reported to intfor database FRCENG set to 1 in CONTROL_CONTACT DATABASE_BINARY_INTFOR Fix d3plot problem in MPP if user turns on thermal output when there is no thermal in the problem Add MPP support for output of guided cable CONTACT_GUIDED_CABLE data in ncforc file Improvement to jobid handling in 12a utility so that binout files from multiple jobs with or without a jobid prefix can be converted with the single command 12a j binout You get all the right output with the correct prefix according to the job id Add ALE_MULTI MATERIAL_GROUP AMMG info into matsum output both ASCII and binout Fix bug in writing out rcforc in MPP implicit ELEMENT Switch shell formulation 14 to 15 SECTION_SHELL in models that include axisymmetric SPH Correct a bug for shell type seatbelt that occurs when nodes in EDGSET of SECTION_SHELL a
7. This report takes into account the particular instructions and requirements of our client It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party Job number 21790500 Ove Arup amp Partners Ltd The Arup Campus Blythe Gate Blythe Valley Park Solihull B90 8AE United Kingdom www arup com LS DYNA Software Release Notes Version 971 R6 1 0 Ove Arup and Partners Limited August 2012 ARUP LS DYNA Software Release Notes Version 971 R6 1 0 Contents Page 1 Introduction 1 2 New Features 2 Airbag 3 BOUNDARY 4 CONTACT 4 CONSTRAINED 6 CONTROL 6 DATABASE 6 ELEMENT 7 FREQUENCY_DOMAIN 9 INITIAL 9 LOAD 9 MAT 9 ALE 11 SPH 11 EFG 11 IMPLICIT 11 Thermal 12 MPP 12 Forming 12 Isogeometric Elements 13 Miscellaneous 13 Ove Arup and Partners Limited August 2012 LS DYNA Software Release Notes Version 971 R6 1 0 1 Introduction Herein are summarized most of the new features enhancements and significant corrections made since the previous release 971 R6 0 0 New features are listed first in no particular order Enhancements and corrections are then listed by category Ove Arup and Partners Limited August 2012 Page 1 LS DYNA Software Release Notes Version 971 R6 1 0 2 New Features e Add new keyword MAT_THERMAL_DISCRETE_BEAM to define thermal properties for ELFORM 6 beam elements e Add option to CONTROL_THERMAL_SOL
8. VER invoked by TSF lt 0 which gives the thermal speed up factor via a curve This feature is useful when artificially scaling velocity in metal forming The tool closing occurs first followed by the punch motion This features allows a different time scaling to be applied to the binder followed by the punch e Implement a nonlinear form of Darcy s law in MAT_ADD_PORE_AIR which allows curves to define the relationship between pore air flow velocity and pore air pressure gradient e Extend Option PART in SET_SEGMENT_GENERAL to allow reference to a beam part This allows for creation of 2D segments for traction application e Add options SET_SHELL SET_SOLID SET_BEAM SET_TSHELL SET SPRING to SET_NODE_ GENERAL so user can define a node set using existing element sets e Add options SET_SHELL SET_SOLID SET _SLDIO SET_TSHELL SET_TSHIO in SET_SEGMENT_GENERAL so user can use existing element sets to define a segment set e Implement BOUNDARY_PRESCRIBED_MOTION_SET_BOX whereby constraints are applied only for nodes that fall inside a defined box e Added functionality of IPNINT in CONTROL_OUTPUT IPNINT gt 1 causes d3hsp to list the IPNINT smallest element timesteps in ascending order e Section and material titles are echoed to d3hsp section title ww section title material title 2 ccsece sseeeee material title e Add option MOARFL on Card 1 Column 6 of DEFINE_CONNECTION_PROPERTIES EQ 0 modeled
9. area goes down with shear default EQ 1 modeled area stays constant e Add option _ HALF SPACE to the keyword FREQUENCY_DOMAIN_ACOUSTIC_BEM update on the input card format e Create file kill_by_pid during MPP startup which is a shell script When executed this will run kill 9 on every MPP dyna process started as part of this job This is for use at the end of submission scripts as a fail safe cleanup in case the job aborts Ove Arup and Partners Limited August 2012 Page 2 LS DYNA Software Release Notes Version 971 R6 1 0 Add a new parameter in the second card of CONTROL_SPH to choose the type of artificial viscosity formulation for the SPH particles EQ 0 Monaghan type artificial viscosity formulation is used EQ 1 Standard type artificial viscosity formulation from solid element is used which may give better energy balance but is less stable in specific applications such as high velocity impact Add optional friction in CONTACT_2D_NODE_TO_SOLID for SPH Add new keyword ALE_COUPLING_NODAL_CONSTRAINT which provides a coupling mechanism between ALE solids and non ALE nodes The nodes can be from virtually any non ALE element type including DISCRETE_SPHERE EFG and SPH as well as the standard Lagrangian element types Develop ALE_ESSENTIAL_BOUNDARY to replace EBC in CONTROL_ALE The command can be repeated multiple times Implement DELETE_ALECPL for small restarts in order to delete coupling define
10. d contacts Because this doesn t work for MPP Groupable tied contacts an error trap has been added e Add consistency option to ORTHO_FRICTION contact options for SMP ncpu lt 0 e Added forces from CONTACT_GUIDED_CABLE to ncforc ASCII and binout Ove Arup and Partners Limited August 2012 Page 5 LS DYNA Software Release Notes Version 971 R6 1 0 e Fix initial penetration check of SOFT2 MPP contact The reporting of initial penetrations between segments on different processors was accessing memory incorrectly and caused a segmentation fault e Fix bug in CONTACT_AUTOMATIC_GENERAL in which forces from beams were not properly reported to rcforc and intfor in some cases DATABASE_RCFORC DATABASE_BINARY_INTFOR CONSTRAINED e Fix an issue with implicit storing the resultant forces for CONSTRAINED_SPOTWELD CONTROL e Fix an error in integrating psi for JNTF 1 in CONTROL_RIGID This bug has been present since revision 68515 e Fix for echoing of CONTROL_FORMING_PARAMETER_READ parameters and parameter_expressions that depend on them to the d3hsp file e Fix MPP bug that caused improper check of dynamic relaxation convergence when a part set was selected for convergence checking IDRFLG 3 in CONTROL_DYNAMIC_RELAXATION DATABASE e Correct a bug in gceout data DATABASE _GCEOUT for MPP e Correct an MPP bug in nodal stress strain output written according to NODOUT in DATABASE_ EXTENT_BINARY e Discret
11. d with ALE_COUPLING_NODAL_CONSTRAINT Can also be used to reinstate the coupling in a later restart Implement DEFINE_VECTOR_NODES to define a vector with two node points Add CONTACT_AUTOMATIC_SINGLE_SURFACE_TIED to allow for the calculation of eigenvalues and eigenvectors on geometries that are connected by a contact interface of the type CONTACT_AUTOMATIC_SINGLE_ SURFACE A new parameter RBSMS on CONTROL_RIGID affects rigid body treatment in Selective Mass Scaling CONTROL_TIMESTEP When rigid bodies are somehow connected to deformable elements RBSMS 0 default results in spurious inertia due to improper treatment of the nodes at the interface RBSMS 1 alleviates this effect but an additional cost is incurred Add input parameter TET1OJTOL for CONTROL_SOLID Sets tolerance for issuing warning when J_min J_max goes below this tolerance value i e quotient between minimum and maximum Jacobian value in the integration points for tetrahedron type 16 This is good as an indication of poor meshes in implicit that might cause convergence problems Add option MISMATCH to BOUNDARY_ACOUSTIC_COUPLING to handle coupling of structural element faces and acoustic volume elements ELFORMs 8 and 14 in the case where the coupling surfaces do not have coincident nodes Airbag Fix AIRBAG_PARTICLE keyword reader error when _ID and _MPP are used in the same command Add porosity leakage formulation in MAT_FABRIC MAT_034 FLC lt 0
12. e beam materials 70 71 74 94 121 are based on change in length from initial length to calculate the axial force Output the change in length instead of zero axial relative displacement to ASCII file disbout e Fix incorrect stress strain output in elout when CMPFLG 1 in DATABASE EXTENT_BINARY for MAT_002 solids e Fix incorrect stress output to d3plot for thick shells Now in agreement with stress from elout e Add support for DATABASE_RCFORC_MOMENT in implicit mechanics e Fix Lagrange Multiplier formulation of joints output to bndout database for MPP e Add after the first implicit time step the output of projected cpu and wall clock times This was already in place for explicit Also echo the termination time e Include upgrades to the output to the DATABASE MASSOUT file e optionally add mass for nodes belonging to rigid bodies e add summary table at end of file Ove Arup and Partners Limited August 2012 Page 6 LS DYNA Software Release Notes Version 971 R6 1 0 Add generation and storage of resultant forces for the LaGrange Multiplier Treatment of Joints for Explicit This gets the correct output for this capability to file jntforc DATABASE _JNTFORC Fixed bug in d3plot if a solid part is removed Fixed naming convention for intfor files DATABASE _BINARY_INTFOR produced by restarts so data is not overwritten and all data can be read by LS PrePost Fixed IEVERP option for DATABASE_EXTENT_INTFOR in
13. ent stability problems the time step may be reduced or selective mass scaling CONTROL_TIMESTEP increased e Fix 2D plane strain and 2D axisymmetric elements SECTION_SHELL so that spin is correctly considered Materials that use the Green Lagrange strain were not correctly rotating the deformation gradient F tensor and so were producing poor stress and strain in parts that spin Also the other materials that calculate strain from the rate of deformation have a fix to the objective stress update option OSU in CONTROL_ACCURACY so that they are more accurate e Enable orthotropic materials to work with tetrahedral ELFORMs 16 and 17 Prior to this fix the material directions were not being properly determined so stress values were incorrect Also the 4 node tetrahedral ELFORMs 4 10 13 were made to work with orthotropic material even if the element connectivity is not input as n1 n2 n3 n4 n4 n4 n4 n4 e Enable proper stress and strain output in the material coordinate system of thick shell ELFORMs 3 and 5 SECTION_TSHELL with user defined anisotropic materials that have IHYPER 1 MAT_USER_ DEFINED _ or that use the vecumat routines e Fix spurious introduction of boundary conditions in degenerate acoustic volume elements ELFORMs 8 and 14 e Added automatic treatment of degenerate acoustic elements with ELFORM 8 explicitly treating tetrahedrons and pentahedrons as such Tria and quad faces at acoustic structure boundary al
14. for particle gas airbag AIRBAG_PARTICLE Ove Arup and Partners Limited August 2012 Page 3 LS DYNA Software Release Notes Version 971 R6 1 0 BOUNDARY Disable BOUNDARY_PRESCRIBED_ACCELEROMETER during dynamic relaxation Fix real 8 mismatches in BOUNDARY_PRESCRIBED_ORIENTATION Also for implicit only fix array dimensioning error Promote some local variables in BOUNDARY_PRESCRIBED_ORIENTATION to double precision fixes a problem which showed single and double gave different results when small deviations in angle were prescribed Also fix all settings so BODY 1 and PIDA 0 is consistent with the old method of PIDA PIDB Fix a bug in BOUNDARY_PRESCRIBED_ORIENTATION_RIGID where rotations about body fixed axes are desired Issue a warning to use BODY 1 instead of PIDB PIDA and set defaults accordingly Also clean up some warning error messages for blast coupled to ambient ale and initial angular offset for JNTF 1 Add new parameter CVRPER to BOUNDARY_PAP CVRPER is cover material porosity see User s Manual for details Redefine BLOCK in BOUNDARY_PAP to take care of partial leakage when nodes of solid elements are involved in contact BLOCK serves as an interpolation factor between the boundary pressure and the calculated pressure Fix bug in INCLUDE_TRANSFORM with BOUNDARY_CONVECTION_SET or BOUNDARY_RADIATION_SET The segment set id was incorrectly offset by the element offset Make corrections for Impl
15. icit and BOUNDARY_ PRESCRIBED ORIENTATION needed due to relative motion feature Fix bug affecting staged construction models _ STAGED_CONSTRUCTION having more than one stage and in which time dependent soil consolidation _ PORE FLUID is simulated with automatic time factoring Time factoring allows long consolidation times to be modeled within a reduced analysis time The bug caused the second and subsequent stages to commence with high time factoring instead of resetting the time factor to 1 leading to inaccurate results in those stages CONTACT Fix a bug affecting CONTACT_ENTITY when GEOTYP 1 and INTORD gt 0 Add incremental update of normal option TIEDID in optional card D of CONTACT_TIED_SURFACE_TO_SURFACE for SMP to eliminate spurious stresses that may appear in some applications Fix part set not found error when using SET_PART_ADD for the DEFINE_FRICTION parts Ove Arup and Partners Limited August 2012 Page 4 LS DYNA Software Release Notes Version 971 R6 1 0 e Fix bug in CONTACT_AUTOMATIC_ _TIEBREAK options 7 10 in MPP where the offset was treated incorrectly e Fix MPP initialization error affecting CONTACT_RIGID_SURFACE e Fix several issues that could result in instability in CONTACT_TIED_SHELL_EDGE_TO_SURFACE_BEAM_OFFSET in MPP including case where solid element surfaces comprise the slave side and offset distance is very large e Fix instability of MPP for full deck restart that
16. olid thick shell etc e Fix a bug affecting SET_SEGMENT_ADD e Correct the transformation of RIGIDWALL_GEOMERIC_PRISM when it is included by INCLUDE_TRANSFORM The bug mostly occurred when SCALE was used in DEFINE_ TRANSFORMATION e Increase the number of digits for VALUE of SENSOR_SWITCH in dyna str so user input values can be more accurately passed to solver e Remove the restriction of 0 lt FRIC lt 1 0 for RIGIDWALL_GEOMETRIC e Fix input error when DEFINE_TABLE_3D s used instead of DEFINE_ LOAD_CURVE for LCY1 to LCYS of MAT_UHS_STEEL e Fix missing CID in DEFINE_VECTOR keyword after being transformed by INCLUDE_TRANSFORM e Fix spurious error when using SET_PART_LIST_GENERATE that includes parts from PART_COMPOSITE e Fix bug which causes spurious warning and subsequent error when vO in DEFINE_CURVE_SMOOTH is lt 0 0001 and nonzero e Fixed bug in use of label in SECTION_SHELL for SECID e Fixed status out file if no glstat or sense switch sw2 is requested e Fix for table ID offset IDFOFF from INCLUDE_TRANSFORM It was not accounted for in CONTACT_ FS 2 0 and FD table ID e Fix hang during input phase in case there is an include file INCLUDE with an END statement in the middle of a gpg encrypted block e Add support for KEYWORD_JOBID when using internal CASE driver e Fix problem with long lines in DEFINE_CURVE_FUNCTION where parameter expansion was causing the lines to be truncated
17. orithm is implemented now for SMP which scales properly and gives consistent results EFG e Fix bug in triangular element sorting for EFG shells IMPLICIT e Fix an implicit solid formulation 3 bug that was introduced in Rev 70242 e Fix implicit mechanics for small restart e Fix implicit initialization when imflag in CONTROL_IMPLICIT_GENERAL gt 1 and dynamic relaxation flag idrflg is 999 e Widen output formats for linear equation solver statistics to support very very large problem output Ove Arup and Partners Limited August 2012 Page 11 LS DYNA Software Release Notes Version 971 R6 1 0 e Make improvements to LSMTD 3 in CONTROL_IMPLICIT_SOLUTION to take care of case when energies have the same sign in the line search Thermal e Change structured file format for control card 27 Several input variables used 15 format limiting their value to 99 999 A recent large model exceeded this limit The format was changed to i10 This change is not backward compatible Old structured input files will no longer run unless control card 27 is changed to the new i10 format This change does not affect the KEYWORD file Therefore this change should be transparent to the user e Fix BOUNDARY_THERMAL_BULKFLOW to correct double accounting for bulkflow element internal energy change This affects the temperature rate of change of fluid flow nodes They will now change temperature faster e CONTROL_OUTPUT keyword parameter NPOPT
18. re transformed by NODE_TRANSFORM Fixed error in reading ELEMENT_SHELL_COMPOSITE Fix several problems with ELEMENT_BEAM_PULLEY Ove Arup and Partners Limited August 2012 Page 7 LS DYNA Software Release Notes Version 971 R6 1 0 e Fix bug for tetrahedral formulation 13 when used together with MAT_024 in implicit The check to see if rate effects are active for implicit was missing Avoid division by zero in the initialization step e Add option to use ELEMENT_BEAM_PULLEY with MAT CABLE DISCRETE BEAM e Fix bug in consistency option for ELFORM 20 solid cohesive elements for SMP ncpu lt 0 e Separate material and geometric stiffness to account for linear buckling analysis in beam formulation 12 e Fix solid ELFORM 15 2 point prism so that rigid body motion does not generate strain and the element time step is not affected by rigid body motion SECTION_SOLID e Fix MAT_024 element failure for ELFORM 12 shell 2D plane stress Elements were not failing e Fix an error with initializing element data of shell ELFORM 3 or 4 triangles when ESORT 2 on CONTROL_SHELL The error showed up as incorrect initial strain energy in some elements but it could have taken on other symptoms e Adda warning during initialization if a user creates thick DKT triangles either by ELFORM 17 on SECTION_SHELL or ESORT 2 on CONTROL_SHELL The warning is written if the shell thickness is greater than maximum edge length Also to prev
19. rsion 971 R6 1 0 e For MAT_224 solids and shells use damage as the failure variable in CONSTRAINED_TIED_NODES_FAILURE e Fix bug for hyperelastic materials to prevent rotating of stresses after constitutive update e Fix the strain output of MAT_CODAM2 MAT_219 for shells The strain increments are transformed to the material direction during the stress update and these transformed increments were being summed for strain output e For triangular shell elements using MAT_034 or MAT_ 134 distribute the mass equally to the 3 nodes rather than in the proportion 1 4 1 4 1 2 3 nodes rather than 1 4 1 4 1 2 which is done currently MAT_FABRIC and MAT_VISCOELASTIC_FABRIC e Modify the behaviour of MAT_ACOUSTIC when used in combination with dynamic relaxation DR Acoustic domain will now remain unperturbed in the DR phase but hydrostatic pressure from the acoustic domain will be applied to the structure during DR A flag to control behaviour of the acoustic domain during the DR phase will be added in a future release ALE e Development of the 3D to 2D mapping in INITIAL_ALE_MAPPING SPH e Update that allows CONTACT_ERODING_NODES_TO_SURFACE contact to be used with SPH elements e Add MPP implementation for the Total Lagrangian SPH formulation 7 CONTROL_SPH e The SPH neighbour search algorithm in SMP was wrong and therefore disabled from R5 to R6 0 Therefore SPH could not scale on those versions A new search alg
20. so now separately treated Ove Arup and Partners Limited August 2012 Page 8 LS DYNA Software Release Notes Version 971 R6 1 0 FREQUENCY_DOMAIN Fix bug in random vibration FREQUENCY_DOMAIN_RANDOM_VIBRATION with random pressure in MPP Implement half space treatment to collocation BEM acoustics with low rank approximations FREQUENCY _DOMAIN_ACOUSTIC_BEM Fix minor problem for reading keyword DEFINE_PLANE INITIAL When INITIAL_ VELOCITY_GENERATION refers to a SET_PART if any part in the set is also the PID of a nodal rigid body CONSTRAINED_NODAL_RIGID_BODY LS DYNA was failing to initialize the velocity of the nodal rigid body This has now been fixed but it is still strongly advised to assign a unique PID unused by any other part to each nodal rigid body LOAD Fix a problem with the non reflecting ambient boundary condition in 2D ALE blast coupling LOAD_BLAST_ENHANCED Incorrect cell pressures were retrieved due to a mem ory pointer error Correct a bug in UXSER_LOADING_SET that occurred only when the user requested large structure format by setting long s on the execution line Fix incorrect behaviour when the applicable dof for node2 for LOAD_MOTION_NODE is a rotational dof Check for eroded elements when applying load with LOAD_ERODING_PART_SET to ensure that the load is applied to the exposed element surfaces Fix for MPP follower force LOAD_ NODE which was broken in r65171
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