METHOD DETERMINING SAFETY ASSURANCE FACTOR OF LOADED MATERIAL Russian patent published in 2001 - IPC

FIELD: analysis of materials by way of determination of their physical properties. SUBSTANCE: invention can find use for determination of excess of breaking stress above level of active mechanical stresses, for detection of flaws-stress concentrators in materials. Expansion f range of tested materials, reduced labor input and increased accuracy of determination of safety assurance factor of loaded material are achieved thanks to recording of pulses of acoustic emission in tested material and to measurement of their quantitative characteristics. Tested material is loaded by two loads P1 and P2, rates N1 and N2 of counting of acoustic emission are measured under these loads and safety assurance factor S1 under load P1 is found from relation S1= (P2-P1)lgA/P1 lg(N2/N1), lgA=(Uo/2.3 RT)-13, where Uo is initial energy of activation of breakage; T is absolute temperature of tested material; R is universal gas constant. EFFECT: expanded range of tested materials, reduced labor input and increased accuracy of determination of safety assurance factor.