June 5, 2018 at 10:01 amAdisaSubscriber
I have found the data sheet of PA6-GF30, and I have question about the Ultimate Stress and criteria of failure of the material.
In the following pic. whether capital letter Y means the Ultimate Stress (the largest stress) and can i put that value of stress (convert to true stress) as criteria of failure.
OR the failure will occur after the Ultimate Stress the end of necking (The necking is not showed in the below pic.) and because that U.Stress and strain can not be the failure criteria?
I read that the secant module is used for the plastic material, but i do not know when i can utilize that. The secant model of PA6-GF30 is shown the next pic.
If someone knows answer, please tell me.
June 5, 2018 at 11:36 amsrangelovaSubscriber
As far as I know in the above diagram Y indicates the point of yielding, whereas B (Bruch) is the point of fracture of the material. The yield point is usually used for serviceability limit state; the point of fracture is when the material will truly fail, but depending on the design you are making different standards place different points as limit states: some consider already plastic behavior as critical. In the diagrams above it seems like true stress-strain rather than engineering stress-strain is depicted, so probably that is why the necking element is missing.
June 5, 2018 at 2:15 pmAdisaSubscriber
Thanks for the answer.
For the metal, the yield point means pass from elastic to plastic and for the plastic it is used for serviceability limit, i.e. after which will occur the necking and after that the part will break. I need break criterial therefor from the above the pic I can not find that point. I think the buch is the point of fracture and in the pic it is fragile fracture (T -40,0 C).
Thanks, If You have some experiments with the plastic material, please send me.
If have anything, what can help me that improve understanding the failure (books, links, analysis), or has anybody.
If somebody has real life test and fem analysis i.e verification fem analysis.
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