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首页> 外文期刊>International Journal of Material Forming: Official Journal of the European Scientific Association for Material Forming - ESAFORM >Forming rectangular tubes into complicated 3D shapes by combining three-roll push bending, twisting and rotary draw bending: the role of the fabrication loading history on the mechanical response
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Forming rectangular tubes into complicated 3D shapes by combining three-roll push bending, twisting and rotary draw bending: the role of the fabrication loading history on the mechanical response

机译：通过组合三辊推动弯曲，扭转和旋转拉伸弯曲将矩形管成复杂的3D形状：制造负荷历史对机械反应的作用

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摘要

Tubular structures find wide application in the automotive context. In particular, rectangular cross-section tubes are used to fabricate structural frames via different techniques, such as Three-Roll-Push-Bending with the addition of twisting component (TRPBT) and the Rotary Draw Bending (RDB). However, whether the accumulated plastic strains, hardening and residual stresses influence the load capacity of the tubular component is still unclear. This paper is intended to shed light on this issue. The load capacity of a tubular mock-up obtained by sequential combination of TRPBT and RDB has been empirically assessed by a destructive compression test. A finite element (FE) model has been devised and validated to analyse the manufacturing processes. This work puts in light the need to correctly model the compliance of the tool set-up for Roll Bending in the numerical calculations. The final shape of the mock-up obtained by FE analysis is the input of the numerical simulation of the compression test. The present modelling has shown clearly that the global resistance of a tubular component is sensitive to plastic strains, hardening and residual stresses resulting from the previous forming processes. Taking into account these three factors greatly improves the capability of the FE to model the mechanical response of the structural part.
机译：管状结构在汽车上下文中找到广泛的应用。特别地，矩形横截面管用于通过不同的技术制造结构框架，例如通过添加扭曲部件（TRPBT）和旋转拉伸弯曲（RDB）来制造三辊推弯曲。然而，是否累积塑性菌株，硬化和残余应力影响管状部件的负载能力仍然不清楚。本文旨在阐明这个问题。通过对TRPBT和RDB的顺序组合获得的管状模拟的负载能力已经通过破坏性压缩测试进行了经验评估。已经设计了一个有限元（FE）模型和验证以分析制造过程。这项工作投入了光线，需要正确地模拟工具设置的符合性，以便在数值计算中滚动弯曲。通过FE分析获得的模型的最终形状是输入压缩测试的数值模拟的输入。本建模已经清楚地表明，管状部件的全局阻力对由先前的形成过程产生的塑性菌株，硬化和残余应力敏感。考虑到这三个因素大大提高了FE模拟结构部件的机械响应的能力。

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