Abstract
The paper presents implementation of fracture prediction algorithm for a cold metal forming process simulation in the software QForm. Authors programmed the function for calculation of the criterion proposed by Bai and Wierzbicki. Obtained results of the simulation in QForm for a deep drawing process are compared with results of experiments. A good agreement between the simulation and experiment was achieved.
Highlights
Use of simulation systems for design of cold metal forming processes is nowadays a key task in the work of an engineer in the field of forming technology
It is determined that the size of a finite element grid almost does not influence a defect occurrence time on both sides of the product that proves a stability of work of the criterion calculation subroutine
It is determined that the size of a finite element grid influences a size of a defect occurrence indication zone
Summary
Use of simulation systems for design of cold metal forming processes is nowadays a key task in the work of an engineer in the field of forming technology. Prediction of the remaining plasticity resource can help forecast strength and plastic properties of a forged part [1] The purpose of the present research was development of the user subroutine for calculation of Bai & Wierzbicki criterion in the widely applicable commercial software product for forming simulation QForm [11, 18]. The research plan included the following: simulation of a deep drawing test case, implementation of the user subroutine in the programming language Lua, testing of sensitivity of the developed subroutine to a finite element grid density, and definition of application potential of the criterion for solving of cold die forming problems. The subroutine may be used for prediction of strength and plastic properties of a material and possible cracking in the course of cold die forging
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