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MID3 blank give zero transverse shear force and stress #170

@victorkemp

Description

@victorkemp

With MSC, transverse shear element force (per unit length) is correct (1.0e+03) but in Mystran, it's 0.0.

Input:

$ Generated by Mecway 29
$-----------------------EXECUTIVE CONTROL SECTION-----------------------
SOL 101
CEND
$-------------------------CASE CONTROL SECTION--------------------------
DISPLACEMENT = ALL
SPCFORCES = ALL
MPCFORCES = ALL
STRESS(CORNER) = ALL
STRAIN(CORNER) = ALL
FORCE(CORNER) = ALL
SPC = 1
LOAD = 1
BEGIN BULK
$---------------------------BULK DATA SECTION---------------------------
GRID*                  1               0          0.0+00          0.0+00*       
*                 0.0+00               0
GRID*                  2               0          1.0-03          0.0+00*       
*                 0.0+00               0
GRID*                  3               0          1.0-03          1.0-03*       
*                 0.0+00               0
GRID*                  4               0          0.0+00          1.0-03*       
*                 0.0+00               0
$--1---><------2-------><------3-------><------4-------><------5-------><--6--->
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ Material $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
MAT1*                  1          2.0+11          1.0+11          0.0+00*       
*                 0.0+00          0.0+00          0.0+00
$--1---><------2-------><------3-------><------4-------><------5-------><--6--->
SPC*                   1               1               1          0.0+00*       
*                                                                       
SPC*                   1               1               2          0.0+00*       
*                                                                       
SPC*                   1               1               3          0.0+00*       
*                                                                       
SPC*                   1               1               4          0.0+00*       
*                                                                       
SPC*                   1               1               5          0.0+00*       
*                                                                       
SPC*                   1               1               6          0.0+00*       
*                                                                       
SPC*                   1               2               1          0.0+00*       
*                                                                       
SPC*                   1               2               2          0.0+00*       
*                                                                       
SPC*                   1               2               3          0.0+00*       
*                                                                       
SPC*                   1               2               4          0.0+00*       
*                                                                       
SPC*                   1               2               5          0.0+00*       
*                                                                       
SPC*                   1               2               6          0.0+00*       
*                                                                       
$--1---><------2-------><------3-------><------4-------><------5-------><--6--->
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ Default $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
PSHELL*                1               1          1.0-04               1*       
*                                                                 0.0+00
CQUAD4*                1               1               1               2*       
*                      3               4          0.0+00          0.0+00
$--1---><------2-------><------3-------><------4-------><------5-------><--6--->
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ force $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
FORCE*                 1               3               0          1.0+00*       
*                 0.0+00          0.0+00          5.0-01
FORCE*                 1               4               0          1.0+00*       
*                 0.0+00          0.0+00          5.0-01
$--1---><------2-------><------3-------><------4-------><------5-------><--6--->
ENDDATA 

MSC output:

                          F O R C E S   I N   Q U A D R I L A T E R A L   E L E M E N T S   ( Q U A D 4 )        OPTION = BILIN  
 
    ELEMENT                    - MEMBRANE  FORCES -                      - BENDING   MOMENTS -            - TRANSVERSE SHEAR FORCES -
      ID       GRID-ID     FX            FY            FXY           MX            MY            MXY           QX            QY
0         1    CEN/4  0.0           0.0           0.0          -8.535399E-17  5.000000E-01 -4.368062E-16 -2.273737E-13  1.000000E+03
                   1  0.0           0.0           0.0           9.097149E-33  5.000000E-01 -4.368062E-16 -2.273737E-13  1.000000E+03
                   2  0.0           0.0           0.0           4.548574E-33  5.000000E-01 -4.368062E-16 -2.273737E-13  1.000000E+03
                   3  0.0           0.0           0.0          -1.707080E-16  5.000000E-01 -4.506840E-16 -2.273737E-13  1.000000E+03
                   4  0.0           0.0           0.0          -1.707080E-16  5.000000E-01 -4.368062E-16 -2.273737E-13  1.000000E+03

Mystran output:

                                                       E L E M E N T   E N G I N E E R I N G   F O R C E S
                                                           F O R   E L E M E N T   T Y P E   Q U A D 4  
  Element Location               N o r m a l   F o r c e s                       M o m e n t s                   T r a n s v e r s e
     ID                                                                                                        S h e a r   F o r c e s
                              Nxx           Nyy           Nxy           Mxx           Myy           Mxy            Qx           Qy
        1                 0.000000E+00  0.000000E+00  0.000000E+00  1.035782E-01  5.000000E-01 -1.221245E-16  0.000000E+00  0.000000E+00
           GRD       1    0.000000E+00  0.000000E+00  0.000000E+00  0.000000E+00  5.000000E-01 -5.178908E-02  0.000000E+00  0.000000E+00
           GRD       2    0.000000E+00  0.000000E+00  0.000000E+00  0.000000E+00  5.000000E-01  5.178908E-02  0.000000E+00  0.000000E+00
           GRD       3    0.000000E+00  0.000000E+00  0.000000E+00  2.071563E-01  5.000000E-01  5.178908E-02  0.000000E+00  0.000000E+00
           GRD       4    0.000000E+00  0.000000E+00  0.000000E+00  2.071563E-01  5.000000E-01 -5.178908E-02  0.000000E+00  0.000000E+00

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