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Vol.22, No.3, 2022, pp. 329–333 |
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FRACTURE MECHANICS COMPUTATION TO ESTIMATE THE CONSTRAINT PARAMETERS AND CRACK PATH ORIENTATION M. Amara1, C. Arroussi1, H. Didouh1, M. Hadj Meliani1,2*, G. Pluvinage2 1) LPTPM, Faculty of Technology, Hassiba Benbouali University of Chlef, Chlef, ALGERIA 2) LaBPS-ENIM, Ecole Nationale d'Ingénieurs de Metz, Metz, FRANCE *email: m.hadjmeliani@univ-chlef.dz
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Abstract The paper provides some critical review of the history and states of art of methods taking account the constraint parameters. The methods proposed in the literature which measure T stress at constant distance near the crack or notch tip are not conservative. The example of CT specimen loaded in mode I obtained by using 2D finite element method with the software ANSYS 15.0, is taken to support this argument. Numerical results confirm that the T-stress is not constant near or on the back of the crack/notch tip. A numerical method based on the volumetric method developed by Pluvinage is used to define the T-stress value to be take into account. This method is characterised by the determination of the effective stress Tef over an effective distance Xef ahead of the crack tip. Keywords: constraint, T stress, Q parameter, stress triaxiality, plastic constraint factor |
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full article (499 kB)
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