J. Friedlein, M. Böhnke, Malte Schlichter, M. Bobbert, Gerson Meschut, J. Mergheim, Paul Steinmann
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引用次数: 0
摘要
与大块金属成型类似,铆接的特点是大的塑性变形和各种不同的三维应力状态,包括严重的压缩。然而,塑性成形的固有特点是缺陷的成核和生长,缺陷对材料行为的有害影响可以用连续损伤模型来描述,并最终导致材料失效。由于损伤的演变在很大程度上取决于应力状态,因此需要利用应力状态相关模型来正确跟踪累积。为了制定该模型并对其进行参数化,除了经典实验外,本文还纳入了所谓的改进冲压试验,以通过捕捉更大范围的应力状态和金属成型的特定加载条件来加强失效模型的校准。此外,在考虑高延展性材料时,如本文研究的双相钢 HCT590X 和铝合金 EN AW-6014 T4,在断裂前可能会出现强颈和局部化。这会改变应力状态,并影响破坏时的实际应变。通过将塑性和损伤耦合起来,将损伤引起的软化效应纳入其中,可以捕捉到这种影响。通过进行反向参数识别来确定上述两种韧性金属的损伤和失效参数,并基于多达 12 个不同的实验来显示其相对重要性。
Material Parameter Identification for a Stress-State-Dependent Ductile Damage and Failure Model Applied to Clinch Joining
Similar to bulk metal forming, clinch joining is characterised by large plastic deformations and a variety of different 3D stress states, including severe compression. However, inherent to plastic forming is the nucleation and growth of defects, whose detrimental effects on the material behaviour can be described by continuum damage models and eventually lead to material failure. As the damage evolution strongly depends on the stress state, a stress-state-dependent model is utilised to correctly track the accumulation. To formulate and parameterise this model, besides classical experiments, so-called modified punch tests are also integrated herein to enhance the calibration of the failure model by capturing a larger range of stress states and metal-forming-specific loading conditions. Moreover, when highly ductile materials are considered, such as the dual-phase steel HCT590X and the aluminium alloy EN AW-6014 T4 investigated here, strong necking and localisation might occur prior to fracture. This can alter the stress state and affect the actual strain at failure. This influence is captured by coupling plasticity and damage to incorporate the damage-induced softening effect. Its relative importance is shown by conducting inverse parameter identifications to determine damage and failure parameters for both mentioned ductile metals based on up to 12 different experiments.