WaiChing Sun's blog

Dear Colleagues, 

We are currently organizing a Symposium on Geomaterials: Poromechanics and Failure, for the upcoming EMI International Conference  "Mechanics for Civil Engineers Against Natural Hazards" in Hong Kong Polytechnic University, Hong Kong, from January 7th to 9th, 2015. 

We would like to invite submission for abstracts on modeling, characterization, and experimental studies on geomaterials for disaster prevention (landslides, earthquake) and for problems related to new energy applications (e.g. fracking, induced seismic events). 

Dear all,

Dear mechanicans,

        For non-local continuum, is there a proper approach to determine the size of the REV in experiment? For the classical linear elastic continuum, one can measure the homogeneized stress and strain (or local averaged stress/strain)  and compute a homogeneized elastic constitutive tensor. However, I am not sure how to do it for non-local continuum, since the constitutive response is now sensititve to the gradient term. Any comment/suggestion is appreciated. 

Regards,

 WaiChing Sun

Dear all,

     Many numerical implementation of plasticity model uses spectral decomposition to represent the Cauchy stress, elastic strain,  such that stress update algorithm is written in the principal directions. As a result, I wonder what makes it benefical to write the stress update algorithm in spectral form? 

 Thanks,

WaiChing Sun

Does anyone knows where I can find any paper discuss the existence of potential functinoal for materials that violate the maximum plastic dissipation principle (due to non-convex yield function and/or non-associately fluw rule)?