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Remarks on constitutive and structural modelling of small radii in sheet metal and crashworthiness simulation

机译:浅析金属板和耐火性模拟中小半径的结构性和结构建模

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In recent years, one has seen a tremendous progress in methods for the simulation of production processes, especially in the automotive industry, Besides sheet metal forming, casting of alloys, moulding of polymers and various additive techniques are the key methods in manufacturing. In this list, sheet metal forming is unarguably the most mature virtual discipline to predict part producibility and the local properties. However, when it comes to transferring results from sheet metal forming simulation to further disciplines, like stiffness, NVH or crashworthiness simulation, a number of incompatibilities between the models need to be resolved. This is particularly pronounced when locally varying part properties are relevant. For situations in which the discrepancies in the constitutive models arc not too dominating, this has been done successfully in the past by simply transferring thickness, plastic strain and possibly stresses, using shell elements in both disciplines. But since local effects, like extreme thinning, sharp bending or the onset of instability may dominate the fracture process in crashworthiness, especially when modern high strength alloys are regarded, these effects need to be investigated in more detail. In particular, their accurate evaluation may require modelling with 3D solid elements. On the one hand, the incompatibilities of the models become clearly obvious from the spatial discretization, while on the other the demand w.r.t. accuracy in crashworthiness is ever increasing. The present contribution focuses on the ability to capture demanding deformation slates with classical and advanced shell formulations, which is seen as a first step in order to close the corresponding gap in the simulation process chain in a more general sense.
机译:近年来,人们已经看到了生产过程的模拟方法的巨大进展,特别是在汽车行业中,除了板金属形成,合金的铸造,聚合物的成型和各种添加剂技术是制造的关键方法。在该列表中,钣金成型是不可识别的最成熟的虚拟学科,以预测部分可生产性和局部特性。然而,当涉及从钣金形成模拟转移到进一步学科的结果时,如刚度,NVH或Crashworthess模拟,需要解决模型之间的许多不兼容性。当局部变化的零件属性相关时,这特别明显。对于本构模型的差异而不是过于主导的情况,这在过去通过简单地传递厚度,塑性应变和可能的应力,这已经成功地完成了两种学科的情况。但由于局部效应,如极端稀释,急剧弯曲或不稳定性的起始可能使断裂过程中的撞击性占主导地位,特别是当近代高强度合金被认为时,需要更详细地研究这些效果。特别地,它们的准确评估可能需要使用3D实体元素建模。一方面,模型的不兼容从空间离散化方面变得明显明显,而其他需求W.R.T. Crashworthess的准确性永远在增加。目前的贡献侧重于捕获具有经典和先进的壳体制剂的苛刻变形板岩的能力,该制剂被视为第一步,以便在更一般的意义上关闭模拟过程链中的相应间隙。

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