Luca96
Aerospace
- Jul 22, 2022
- 1
Hello everyone. I’m an aerospace engineering student. For the thesis work, I am performing a nonlinear implicit analysis (SOL 400) and I have a problem. In particular I am realizing a hertzian contact between a steel cylindrical indenter and a plate with the following equivalent mechanical properties: E=1.3086e+09 Pa and Poisson ratio =-0.5166.
I realized the contact conditions and set up the analysis. The analysis setting can confirm that it is correct because previously set up the same analysis but with the plate made of aluminum , Nastran did not give problems.
If I assign to the plate a material (isotropic) with the mechanical characteristics described above, Nastran in f.06 reports that " USER FATAL MESSAGE 25004 (TA1M)- POISSONS RATIO OF MAT1 ID 2 IS LESS THAN ZERO OR GREATER THAN 0.5".
I cannot understand how to solve this problem, since my aim is to analyze how a plate with a negative Poisson ratio behaves.
if anyone can help me I would be very pleased.
I realized the contact conditions and set up the analysis. The analysis setting can confirm that it is correct because previously set up the same analysis but with the plate made of aluminum , Nastran did not give problems.
If I assign to the plate a material (isotropic) with the mechanical characteristics described above, Nastran in f.06 reports that " USER FATAL MESSAGE 25004 (TA1M)- POISSONS RATIO OF MAT1 ID 2 IS LESS THAN ZERO OR GREATER THAN 0.5".
I cannot understand how to solve this problem, since my aim is to analyze how a plate with a negative Poisson ratio behaves.
if anyone can help me I would be very pleased.
