Sequential shock test

Mani kumar_21615
Mani kumar_21615 Altair Community Member
edited October 2020 in Community Q&A

Hi,

 

    I performing a modal transient analysis.

 

My concern is , the part shall be subjected to a half-sine shock of peak acceleration of  50g and pulse duration of 8 milliseconds.  
  For both the tested-device shall be subjected to three shocks  in positive x axis and 3 shocks in Negative Y axis in all three directions.

Total of 18 shocks.

 

Usually in lab only one part should be tested for all 18 shocks

 

I have created proper load step for modal transient analysis

for second load step i have called 1st load step by using STATUS(PRELOAD) and so on

 

 

I am facing this error.

 

*** ERROR # 1999 *** in the input data:
 In SUBCASE 2: card STATSUB(PRELOAD) references wrong type SUBCASE 1.
  
 *** ERROR # 1999 *** in the input data:
 In SUBCASE 3: card STATSUB(PRELOAD) references wrong type SUBCASE 2.
  
 *** ERROR # 2360 ***
 STATSUB(PRELOAD) cannot be nested: SUBCASE 3 PRELOAD from SUBCASE 2.

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Answers

  • PrasannaK
    PrasannaK
    Altair Employee
    edited April 2020

    Hi Mani,

     

    STATSUB(PRELOAD) can only be used to reference linear static or nonlinear static subcases. STATSUB(PRELOAD) can be used to apply preloading for linear static, normal modes, complex eigenvalue, direct frequency response, modal frequency response, direct transient response, and modal transient response solution sequences.

     

    In this case, your subcase 1 should be linear or non-linear static subcase.

     

    Thank You

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