Abstract: Studies of mechanical and thermal properties of materials. The method for determining a CLTE coefficient of a material comprises moving relative to each other a sample of the material and a source of heating a surface of the sample. While moving, the surface of the sample is heated with a periodic change in a density of a heating power, and an amplitude of deformation of the sample surface by heating is measured. Coefficient of linear thermal expansion is calculated based on measurement results and taking into account a density and a volumetric heat capacity of the sample. A device for determining CLTE comprises a platform for placing a sample of a material, a heating source configured to change a density of a heating power, at least one sample surface deformation amplitude sensor and a system for relative movement of the sample, the heating source and the surface deformation amplitude sensors.

Abstract: At least two samples of a porous medium with different lengths are exposed to acoustic waves emitted by a source. For each sample, acoustic wave arrival times are registered at a receiver and acoustic propagation velocity in the porous medium is determined by analyzing changes in the arrival times relative to changes in the lengths of the samples.