module to use for calculation of plastic plate

[olga]

Please, tell me what module to use for calculation of deflection of two edges supported plastic plate. I think it has to be flexural module, but I am confused, because for steel I used elastisity module. Look like the definition of them is same, but sametime numbers are different.

Thanks in advance.

 

[insideman]

Your confusion is caused by the fact that moduli for plastic are not straight line functions. So a number that is a secant to the true stress strain curve is commonly used. This is the flexure modulus. Use it and be happy!

 

[olga]

Thank you, very much for the answer. I greatly appreciate your help.