Prediction of Chevron Cracks in Multipass Drawing

Shiga, Akira; Yamashita, T.; Neishi, Yutaka

doi:10.2320/matertrans.p-m2019840

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…In view of improving the solution accuracy and obtaining mechanical property parameters over a wide range of stress triaxiality, it is common to design notched specimens with different shapes for tensile testing. 23,24) In this paper, 6 groups of notched specimens representing different stress states were designed, including triangular specimens (TRI1, TRI2), shear specimens (SHE1, SHE2), and circular arc specimens (ARC1, ARC2), whose specimen shapes, sizes and numbers are shown in Fig. 4.…”

Section: Tensile Testsmentioning

confidence: 99%

Prediction and Experimental Verification of the Critical Fracture Blank Holder Force for Deep Drawing of Box-Shaped Parts

et al. 2022

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In this paper, the deformation law of box-shaped parts drawing was analyzed, and the mathematical expression for calculating the critical fracture blank holder force (BHF) was deduced. In order to determine the fracture parameters of 08Al sheet, notched specimen tensile tests were conducted, the full-field strain of the specimens from deformation to fracture was obtained by the digital image correlation (DIC) technology. The evolution law of the stress triaxiality and Lode parameter with plastic deformation was obtained, and the fracture parameters of the modified Mohr-Coulomb (MMC) fracture criterion were fitted by the least squares method. The finite element (FE) simulation model coupled with MMC ductile fracture criterion was established to simulate the fracture behavior of sheet. The reliability of theoretical calculation was evaluated by FE simulation and experiments under various process conditions. The results demonstrated that the prediction of the critical fracture BHF by theoretical calculation and FE simulation were both partial safety predictions and all fracture earlier than the tests. In the theoretical calculation, when the flange shrinkage rate was 0.19, the critical BHF was the smallest, and the error was 17.5% compared with the tests, the theoretical calculation was closer to the test results. The theoretical calculation and FE simulation coupled with ductile fracture criterion provide a reference value for predicting the critical fracture BHF and intelligent control in actual production.

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Section: Tensile Testsmentioning

confidence: 99%

Prediction and Experimental Verification of the Critical Fracture Blank Holder Force for Deep Drawing of Box-Shaped Parts

et al. 2022

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Research on the Application of Ductile Fracture Criterion in Fracture Prediction during Sheet Metal Deep Drawing

et al. 2022

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In order to obtain the fracture strain of notched samples, the digital image correlation (DIC) technology is employed in this paper. The values of fracture-related state variables such as stress triaxiality and Lode parameter are obtained through mathematical transformation. The fracture parameters of Lou-Huh ductile fracture criterion (DFC) are calibrated by surface fitting with least square method, and the fracture curve is drawn and applied to the fracture prediction during deep drawing. The reliability of DFC is verified considering fracture stroke and location through tests. The results show that the fracture curve can predict the initiation and location of fracture successfully. Fractures are all predicted in advance under multiple blank holder force (BHF) conditions. Comparison results of finite element (FE) simulation and experiment show that the maximum error of fracture stroke is 12.9% and the fracture locations are generally consistent. The prediction of DFC is partial to safety.

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Prediction of Chevron Cracks in Multipass Drawing

Cited by 2 publications

References 8 publications

Prediction and Experimental Verification of the Critical Fracture Blank Holder Force for Deep Drawing of Box-Shaped Parts

Prediction and Experimental Verification of the Critical Fracture Blank Holder Force for Deep Drawing of Box-Shaped Parts

Research on the Application of Ductile Fracture Criterion in Fracture Prediction during Sheet Metal Deep Drawing

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