Numerical simulation of damage fields and residual stresses after hole punching
Journal Title: Вісник Житомирського державного технологічного університету. Серія: Технічні науки - Year 2018, Vol 81, Issue 1
Abstract
The article studies the process of reinforcing the technological hole in the aluminum aviation alloy D16CHT for various levels of plastic deformation corresponding to the level of plastic deformation of 1 %, 2 %, and 3 % by technological hole processing. In the finite elemental package of Abaqus Student Edition, the dynamic task of simulating the technological hole processing is solved by creating the corresponding finite element of the model and the calculation of the contact problem with an explicit integration scheme. To improve the quality of the calculation level, the division of the models into zones with different parameters of the finite element geometry is used. Based on the results of numerical simulation, the distribution of damageability in the zone of the technological hole for various levels of plastic deformation, studied in the present work, was obtained. The parameter of damageability, which depends on the level of plastic deformation, was considered as a scalar quantity, and it was estimated by changing the modulus of elasticity of the first kind. The fields of distribution of residual stresses and equivalent plastic deformation were obtained. The dependence of the change in the principal residual stresses on the inner surface of the hole is gained depending on the depth of the hole. On the basis of numerical calculations, we obtained the effect of the residual strain on the initial level of material damage in the area of the technological hole. The redistribution of the equivalent plastic deformation and residual stresses during the subsequent loading of the technological hole with tensile loads is analyzed.
Authors and Affiliations
O. V. Tymoshenko, B. O. Yakhno, A. M. Babak, Fam Dick Quan
Keywords
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