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[Dat Vu Nguyen]

I am working on a personal project but have an issue with setting the boundary constraints for the model. I want to fix it on the ground and put the external loading on it, but it could not be solved as there are several warnings and errors below. Would you have any recommendations for me?

 

[Aniket]

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[Dat Vu Nguyen]

Thank you for your reply!

 

However, I have a new issue that my problem involves large deformation with force applied on the surface at 18 kips (around 18,000 lbf) but the result is distorted as in Figures 1 and 2. 

 

Would there be anything I could do to improve this? Would static structural analysis be good enough for such a large deformation like this? Should I use another element instead Tetrahedral element in the meshing step to avoid distorted elements in stress-concentrated areas such as in Fig 2?

 

The properties of the material are as follows:

 Elastic = 29000 ksi and Poisson’s ratio = 0.29.

 Density = 7.34E-07 kips/in^3

 Engineering strength:

o   Fy (yield strength) = 43.3 ksi

o   Fu (tensile strength) = 59.9 ksi

o   Peak plastic strain = 0.1 for bilinear plasticity

[Ashish Khemka]

Hi,

Static analysis is good if the load applied is gradual one and if the system remains in equlibrium (overall force reaction should be zero). Turn on the large deflections. With change in mesh the deformation should not change significantly however at regions of higher stress the results may be sensitive to mesh and doing a convergence study might be helpful.

Regards,

Ashish Khemka