Materials Forum

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1. There are several experimental microscopy techniques for the calculation of dislocation density; but are there any reliable numerical ones, as well ? like those, which least include experimental parameters, except for some initial ones, like the initial density of dislocation, such as Reid's formula [1].

2. as a result of dislocation accumulation after deformation, slip bands form. are there any numerical techniques for slip band density estimation?

[1] Reid,N.C.,Gilbert,A., and Rosenfield,A.R.,1965, Phil. Mag.., 12, 409.

abstract: 
  New mathematical and numerical formulations are developed for effective time-dependent non ageing viscoelastic behavior of linear viscoelastic composites. The modeling is based on the dynamic Green's functions, integral equations, and Volterra product. The time concentration tensor is derived through numerical solution of the integral equation and the Mori-Tanaka micromechanical

Hey everybody,

Actually I don't have the same thickness everywhere(that decreases little by little). I tried to part but it's not exactly the same thickness in the same part. Do you know if that can cause a problem? For example I have a scrap like that 10 mm+-2mm for thickness. I would think to fill in the composite layup like that Ply1 : 2 mm-Core : 6 mm-Ply2 : 2 mm

I use this occasion to ask you two more questions : 

HELLO,

I want to know if carbon nanotubes reinforced composites are ductile as I want to do hydroforming process by using ABAQUS or any other metal forming process that can be implemented.

If it is formable than what are values of yeild strength, ultimate tensile strength, plastic strain,etc.

the matrix material is polymer(PmPV).

THANK YOU.

Dear colleagues,

 I'm a graduate student from University of Pittsburgh. I want to make a CNT reinforced ceramic composites (woven structure), but cannot find people to make it for us. Can anyone introduce me any labs or company who can help me? Thanks!

Monica 

Hi everybody,



I'm trying to simulate the structural behavior of High Performance Fiber Reinforced Concrete specimens by means of the Concrete Damaged Plasticity Model.



My constitutive relation is represented by a multilinear law, with a nonlinear pre-peak followed by a softening branch.