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I m Manoj, doing my Mtech in CAD/CAM. I  m doing my project work in design analysis & optimization of seatback of  car seat. I want the information about rear impact & theory material for the same.

Thank's all in advance.

I think the concepts from the constitutive theory, but in many papers the researchers seem that they dont differentiate them.  So could you give me an exact explanation about it?  Thank you.

Shun lai Zang  

B.Eng, MSc, PhD

Lectuer in Material Science and Engineering



School of Mechanical Engineering

Xi'an Jiaotong University

Xi'an ,Shaanxi,China

Can anyone plz send me instructions on how to calculate the coefficients a,b,c,d,h (f,g = 1)  for YLD91 and subsequent ones? I have a rough idea, but if someone has explicit instructions ..

I am glad to introduce VABS, a unique software tool for modeling of composite structures having one dimension much larger than the other two dimensions such as helicopter rotor blades, wind turbine blades, HALE wings, and bridges.

For fatigue life estimation (HCF & LCF), I am not sure which stress shall I consider i.e. max. principal stress or von Mises stress & what should be the criteria for selection of the same? Shall we be driven by material model (i.e. ductile or brittle) or mode of failure or some thing else?