Methods for evaluation of mechanical stress condition of materials

Yordan Mirchev, Pavel Chukachev, Mitko Mihovski, V.M. Vassilev, S.G. Nikolov, M.D. Datcheva, Y.P. Ivanova
2018 MATEC Web of Conferences  
Primary attention is given to the following methods: method by drilling cylindrical holes (drill method) and integrated ultrasonic method using volume (longitudinal and transverse), surface, and sub-surface waves. Drill method allows determination of residual mechanical stress in small depth of material surfaces, assessing type, size, and orientation of principal stresses. For the first time, parallel studies are carried out of mechanical stress in materials using the electroacoustic effect of
more » ... acoustic effect of volume, surface and sub-surface waves on the one hand, and effective mechanical stresses on the other. The experimental results present electroacoustic coefficients for different types of waves in the material of gas pipeline tube of 243 mm diameter and 14 mm thickness. These are used to evaluate mechanical stresses in pipelines, according to active GOST standards.
doi:10.1051/matecconf/201814505008 fatcat:orrurtbmjbh3jed7oa3o3mlluy