you know that glass fiber compressive strength is less that its tensile strength , so, its a very important to model two behavior for glass fiber, one for compressive strength and the other for tensile strength.
You need to input two different value of strength v.s sign of stress in operator form.
Dear Abdelmonem I. El-kholy
Below-mentioned may be useful;
https://www.youtube.com/watch?v=STffMe32uls
https://www.ijrte.org/wp-content/uploads/papers/v8i4/D5162118419.pdf
http://troindia.in/journal/ijcesr/vol2iss2/1.pdf
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