COMPUTERIZED NONDESTRUCTIVE CHECK OF MATERIAL POROSITY

This paper reports the mathematical dependence of material porosity on material structure and conditions of gas flow through material controlled. The design of the device for porosity nondestructive check and a principle of its operation are presented. The results of experimental researches carried out on the products of complex ceramic systems are shown. The accuracy in porosity control on the device offered is substantiated and the recommendations for its use in production are made.

Analysis Technique for the Spectral Characteristic of Acoustic Emission Signals

AE method of nondestructive check is based on exertion waves radiation and their registration during fast local material structure reorganization. It is used as a means of analysis of materials, constructions, productions control and diagnosis during operating time. When registering signal amplitude it is required to consider its frequency distribution connecting each amplitude rate with the corresponding vibration rate. With the purpose to reduce the measurement error it is required to perform receiving piezoelectric converters calibration right on the tested unit and in the process of test analysis consider “unit-converter” transfer characteristic.