The application of stress to multiphase solid-liquid systems often results in morphological instabilities. Here we propose a solid-solid phase transformation model for roughening instability in the interface between two porous materials with different porosities under normal compression stresses. This instability is triggered by a finite jump in the free energy density across the interface, and...

In geotechnical engineering, direct simple shear (DSS) tests are used to determine strength and stiffness parameters of a material. DSS predictions constitutive model influence failure mechanisms in plane-strain, finite-element applications. this article, we introduce closed-form solution the Matsuoka–Nakai equivalent critical friction angle from stress normal data. order apply it clay hypoplas...

Computed tomography (CT) scans were performed on samples of an outburst-prone coal seam at different loading stages. The area and roundness the CT images used to quantify degree macroscopic deformation under loads. A spatial matching algorithm was calculate three-dimensional (3D) displacement fields regions interest (ROIs, containing primary fractures, minerals, only coal) presence fractures mi...

A numerical study on the dynamic responses of irregular fibers under axial tension is presented in this article. The irregularity was represented by a sinusoidal shape profile along the fiber axis. The finite element method was used in the simulations and the maximum first principal stress due to the dynamic pulling has been examined. Our numerical results indicate that the first principal stre...

in order to evaluate drought tolerance of some aegilops triuncialis ecotypes a factorial experiment based on a completely randomized design was conducted under non-stress and drought stress (irrigation until 50% of heading) condition in the greenhouse of mohaghegh ardabili university in 2012. drought tolerance and susceptibility indices for grain yield were calculated and principal component an...