Title: Stress intensity factory sheet and method of measurement thereof
Application Number: 90110357 Application Date: 1990.12.26
Publication Number: 1061095 Publication Date: 1992.05.13
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01B7/16,G01N3/00
Applicant(s) Name: Aviation and Space Flignt Industry No. 623 Inst., Address: 720071
Inventor(s) Name:
Attorney & Agent: WANG XIANKAI
Abstract:
     The invention is based upon the equivalent work theorem in linear elasticity theory to obtain an integration relation between type I and type II stress factors and the boundary forces on picture taking the tip of fissure as center. Using the relation between stress and strain, deformation geometry , and relation of change of electric resistance with strain , a design formula of the slices can be obtained. Based on the value M of the measuring material, according to the design formula, a multilayer resistance-stress factor slice with suitable shape can be designed. During measurements, by sticking said slice on the tip of fissure, connecting it to a bridge circuit of the strain-gauge, the stress-strength factor can be measured directly.
Time: 8