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Humidity has huge effects on multiple multiple mechanical properties such as Stiffness, Fatigue, Creep, bonding, adhesion, corrosion , flowability,stress ,strain in areas such as Polymers, concrete, cement, wood, powders,foodstuff,Bio and other materials.see www.genrh.com for further details or applications.Controlling Humidity critically in conjunction with characterisation techniques such as DMA,AFM,Tensile testing, rheology,XRD,Raman,FTIR and microscopy is key in researching areas such as Moisture Induced Phase transitions, Relaxa

Hi every body

I study the residual stress derived from a circumferential weld on the end of a pipe and degree of freedom in the other end have been taken

but i have a problem in residual stress distribution along axis of pipe.

 its known that the axial stress at the end of constrainted end should be zero or little but mine is in order of 100 MPa while residual stress is 300 MPa.

can anybody give me a hint about whats the source of error



thanks

Hi, guys,

 Do some of you know how Periodical Boundary Condition is implemented in equilibrium equation while using FEM:

div{ C:sym[grad(u)] } = 0 ,where the displacement u is periodical.

Is there any (detailed) documentation about this stuff?

Thank you very much!

 i want some one to clarify fundamental definition ,inter relationship or difference between the following terminologies .

small strain

large strain

small scale yielding

large scale yielding 

Hi,

 Is there some fem code or software that can handle eigenstrain while solving equilibrium equation?

 Thanks!