Metal plate edge cracking prediction considering blanking history

Abstract

The invention relates to a metal plate edge cracking prediction method considering blanking history. The method comprises the following steps: 1) constructing a basic form of an edge cracking prediction model; 2) determining a constitutive model of the metal material; 3) determining a ductile fracture criterion, and calibrating material parameters; (4) obtaining shearing edge tensile samples with different blanking edge part qualities, and obtaining tensile edge part fracture strain; 5) acquiring initial damage values corresponding to different blanking edge part states of the sample; 6) establishing an empirical formula between the pre-damage state variable and the blanking process parameters; and 7) obtaining a complete metal plate edge cracking prediction model considering the blanking history, and performing metal plate edge cracking prediction by using the model. Compared with the prior art, the method has the advantages that the influence of pre-damage caused by blanking on the subsequent forming performance of the material is considered, the pre-damage state variable and the ductile fracture criterion are coupled, the finite element simulation process is simplified, and rapid and effective prediction of the edge cracking phenomenon of the metal plate under high precision is achieved.

Description

technical field [0001] The invention relates to the field of stamping and forming of metal materials, in particular to a prediction of edge cracking of a metal sheet considering punching history. Background technique [0002] Before the sheet metal is subjected to forming processes such as hole reaming and flanging, it is generally necessary to prepare blanks for mass production through the blanking process. The damage caused by blanking becomes an important factor affecting the formability of the sheet metal and the generation of edge cracks. During the subsequent forming process, cracks tend to appear at the shear edges even at strains below the forming limit, and edge cracking has become a frontier concern of researchers and steel manufacturers, due to the conventional forming limit diagram ( FLD) and the current ductile fracture criterion (DFC) do not take tissue pre-damage into account, so commercial numerical simulation tools using these methods still cannot accurately...

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Problems solved by technology

However, the proposed quantitative prediction model often requires a trade-off between computational cost and prediction accuracy, and the overall prediction process is still cumbersome and complicated, which cannot meet the needs of industrial production

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