Fracture Study of Edge Cracked Aluminium Panel Using Extended Finite Element Method

Tom, J (2014) Fracture Study of Edge Cracked Aluminium Panel Using Extended Finite Element Method. Masters thesis, Indian Institute of Technology, Hyderabad.

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Abstract

The extended nite element (XFEM) is a special kind of numerical method to handle dis- continuities and singularities. Hence, it is an indispensable tool for modeling crack. In this work we are exploring the ability of XFEM for modeling the dierent type of fracture problems. We studied three type of fracture problems such as static crack tip elds charac- terization, fatigue life estimation of a cracked Al 2014-T6 panel and the crack propagation studies using XFEM. The XFEM modeling of statically loaded crack is used to validate the least square algorithm proposed by Yoneyanama et. al. [1] for evaluating fracture parameters. In general, stress intensity factor (SIF) and T-stress are used for characterizing the stress eld around the crack tip. These fracture parameters are estimated using the displacement eld around the crack tip obtained experimentally through 2D digital image correlation (DIC) techniques and numerically through XFEM. It is observed that in case of parallel cracks more parameters are needed to represent the displacement eld due to mixed-mode loading because of crack interactions.

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