Modeling HDPE with upper and lower yield points and >300% strain - RADIOSS

[Beider]

Hello,
I am trying to model an HDPE material, which has two yielding points, upper and lower.
And also the material is very high strain of about 850% failure strain.

I am trying to model it with material law36 with plastic stress strain as an input, and shell elements. without a success.
The stress strain curves of the material are attached in the figure:

Also I am attaching the output results in Hyperview:

also attached the rad files and the T01 file with tpl i am using to calculate the stress strain curve.

I think that mat law36 might be incompatible for those high strains, but I couldnt find any material law which can have an input in which there are two yielding points.

any help will be great.

 

[hiper_88]

Hello,

are you sure that the strain is 850%? That value is usual for the elastomers.

From my experience, strain are given in percentage, so you should divide it with 100 to get the real value and then use it in the software.