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Help on using CSHEAR - Extensional stiffness

ahmad.altaf
I am trying to do modal analysis of spar. I have modeled flanges using CBEAM and web using CSHEAR elements . I got modal frequencies but I am not sure if they are correct. I found a technical article which tells to use CROD/ extensional stiffness on all 4 sides of CSHEAR as CSHEAR is unstable element. I didn't use CROD/ extensional stiffness in my model. Can anyone guide me on use of CSHEAR elements (should I use CROD)?
 
My .bdf is attached.
 
 
Technical article:
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  • 0
    Dear Don Graff, thank you for your reply.
     
    My professor has asked me to use CSHEAR element for modeling of spar/rib webs.
     
    Also, the aim is to model whole wing. I have no problem in modeling skins or flanges. However, I am finding it difficult to model CSHEAR elements. Is there any comprehensive tutorial available on use of CSHEARs? Or can you please check the bdf and tell me where I am making mistakes?
     
    Regards,
    A. Altaf
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  • 0
    Dear Don Graff, thank you for your reply.
     
    My professor has asked me to use CSHEAR element for modeling of spar/rib webs.
     
    Also, the aim is to model whole wing. I have no problem in modeling skins or flanges. However, I am finding it difficult to model CSHEAR elements. Is there any comprehensive tutorial available on use of CSHEARs? Or can you please check the bdf and tell me where I am making mistakes?
     
    Regards,
    A. Altaf
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