Failure prediction for nonlinear strain paths in sheet metal forming

• Published in: CIRP annals Vol. 61; no. 1; pp. 259 - 262
• Main Authors: Volk, Wolfram, Hoffmann, Hartmut, Suh, Joungsik, Kim, Jaekun
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier Ltd 2012; Elsevier
• Subjects: Applied sciences; Calibration; Exact sciences and technology; Failure; Failure prediction; Formability; Forming; Mathematical analysis; Metals. Metallurgy; Nonlinearity; Other forming methods; Press forming of metal foils and wires; Production techniques; Sheet metal; Strain; Forming; Sheet metal; Failure prediction; Costs; Behavior in operation; Rupture; Forming limit curve; Formability; Calibration; Fracture criterion; Experimental study; Proportional load; Modeling; Stress path; Finite element method; Non linear effect; Metamodel
• ISSN: 0007-8506
• DOI: 10.1016/j.cirp.2012.03.111

The Forming Limit Curve (FLC) is a conventional failure criterion to estimate sheet metal formability for proportional loading conditions in Finite Element Analysis. Previous studies found that a standard FLC is not suitable for predicting the influence of nonlinear strain paths. This paper introduces a new method for the description of failure behavior in two-step forming operations by using a metamodeling technique. The main objectives of this approach are the cost effectiveness of the required experimental calibration and its practical applicability. The predicted forming limits determined with the proposed method are presented and validated by experimental results.