A post-doctoral position is available at Kongju National University,South Korea to work in the field of nanomechanics(atomistic modeling) or Bio/nano mechatronics.Interested candidate should send their detailed CV to Prof.Sung-Gaun Kim via email to the following email address-(kimsg [at] kongju.ac.kr).The initial contract is for one year and is extendable to multiple years subject to his/her performance and availability of funding.

Hi all,

I have a fundamental question on Tensors. The length of a vector (firts order tensor) is independent of the reference co-ordinate system. In case of second order tensor (stress/strain), the invariants (I1, I2, I3) are independent of the co-ordinate system.

If I consider 4th order tensor (of course 3rd order also), say Cijkl, what parameters are constant? (Like length in vector and invariants in second order tensors).

Thanks in advance,

- Ramdas

I have used cohesive elements to create cracks now I am interested to seal the created cracks in order to study stress changes so I need to add this as a step to my analysis-

Does anybody know any trick for doing this? Can I do this by keeping the pressure inside fracture constant?-please give me comments

The default value of penalty stiffness scale factor in Ansys-Lsdyna  is 0.1, when one varies this value, he/she obtains different results, the question, how can one  know the right value of penalty stiffness scale factor?

I am simulating the impact of a 6mm - diameter steel solid ball with a rigid falt surface using Ansys-Lsdyna. the speed of the ball at the impact moment  is low (from 1 to 10 m/s). specificly, i am intersted in the period between  just touching and  just leaving the ground for the first impact.

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