The Use of the Experimental Optical Technique for Investigation of Shear Strains of the Samples Exposed to Shear Stress Beyond the Yield Point

Abstract

Abstract Objective of the article is option use utilization experimental DIC -Digital Image Correlation method for strain fields detection. For experiment execution was used Dantec Dynamics Q 400 system. Article describes in brief system characteristic in necessary parameter settings for succesful measurement execution. For strain fields detection was used three different geometry samples with reference to uprise stress in the most stressed cross-section where samples effect shear strain. Samples load tension machine were evaluated by ISTRA 4D program. Goal of article is to point to shear strain evaluation in large plastic deformation execution options with restriction by failure stochastic pattern required for point correlation at structural element deformation. There is many elements stressed in manufacturing practice by shear strain where numeric methods are heavy-handedness realised mainly for difficult geometric shape and impossibility of use in real condition.