This paper presents an analytical solution for response of a piezoelectric hollow cylinder under two-dimensional electro thermo mechanical fields. The solution is based on a direct method and the Navier equations were solved using the complex Fourier series. The advantage of this method is its generality and from mathematical point of view, any type of the thermo mechanical and electrical bound...

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...