Photoelastic Analysis of the Stressed State of a Flat Element with Geometrical Stress Concentrators (Cutout and Cuts)

Abstract

The investigation of the stressed state of flat element with the geometrical stress concentrators was performed. The sample was made of piezo optic material. The oval-shape cutout and linear cuts were issued as the stress concentrators. On the symmetrical axles was cut out an oval. Linear cuts were made one by one under the different angles. Each time after appearing of the new cut, we fixed the stress fields in the model. Issue was performed using the axial compression at the elastic linear stage of loading. We used the method of photoelasticity. We estimated the quality and quantity of the influence of the size and the angle of cuts on the element stressed state, and received the stress fields during the different loadings. Also we estimated the stress coefficients near the tops of the cuts.

Photoelastic study of a double edge notched plate for determination of the Williams series expansion

“…Experimental characterization of the crack-tip stress field in isotropic linear elastic materials has been an area of active research for many decades and the problem continues to actual and important at the present time [1][2][3][4][5][6][7][8][9]. The stress distribution in the immediate vicinity of a crack tip can be determined experimentally using optical methods such as caustic, holography, moire, photoelasticity or digital image correlation method.…”

“…The overarching objective of this study is to obtain the stress field in the vicinity of the crack tip in an isotropic linear elastic material experimentally by the digital photoelasticity method based on the multi-parameter Williams series expansion including the higher-order terms. The use of the multi-parametric representation of the stress field is not just for academic curiosity but a necessity in many cases of engineering interest [3][4][5][6][7][8][9][10][11]. The effects of higher-order terms in the Williams expansion were analysed for different cracked specimens by different authors [3; 6].…”

Extraction of Fracture Mechanics Parameters From Fem Analysis: Algorithms and Procedures

“…Thus, the determination of SIF still raises questions. The determination of higher order coefficients requires more accurate approaches [14][15][16][17][18][19][20][21][22][23][24].…”