当前位置: X-MOL 学术Thin-Walled Struct. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Numerical investigation of controllable non-uniform deformation of tailor-welded blanks using heterogeneous pressure-carrying medium
Thin-Walled Structures ( IF 6.4 ) Pub Date : 2023-03-14 , DOI: 10.1016/j.tws.2023.110663
Yi-quan Shu, Nan Xiang, Hao-ran Wang, Meng-han Yang, Peng-yi Wang, Tao Huang, Jun-qing Guo, Fu-xiao Chen

Severe non-uniform deformation occurs in the forming of tailor-welded blanks (TWBs) with a large difference in properties or shell thickness of base materials, which lowers deformability of tailored shell components. Establishing a non-uniform pressure field and using it to form sheet blanks with non-uniform deformability such as TWBs may be a potential solution. In this work, the non-uniform pressure field established by heterogeneous elastomers and mechanism for controlling the deformation of TWBs using this pressure field were studied numerically. Concretely, a modified three-region model was proposed to describe the structure of TWBs based on the sectional distribution of microhardness. Finite element models of TWBs and heterogeneous elastomers were established and validated accordingly. The “higher” and “lower” pressure generated by different partitions of the heterogeneous elastomer were employed to form the “stronger” and “weaker” regions of TWBs, respectively. Forming processes using heterogeneous elastomers with different ratios of Shore hardness (ζ) as the flexible dies were simulated. The results showed that with the decrease of ζ, excessive deformation in the “weaker” side was alleviated and deformation uniformity of TWBs was greatly improved. Stress triaxiality at three characteristic regions (i.e., the “stronger” side, the “weaker” side, and the transition region) was increased simultaneously. Stress localization in the weld seam and its heat-affected zones (HAZs) was alleviated as well. In addition, results of failure analysis showed that deformation uniformity of TWBs could be greatly improved (+19.62%) on the premise of sacrificing a few forming limits (−4.34%) by using the optimal heterogeneous elastomer.



中文翻译:

异质承压介质拼焊板可控非均匀变形数值研究

拼焊板(TWB) 的成形过程中会发生严重的不均匀变形,拼焊板的母材性能或壳厚差异较大,这会降低拼焊壳组件的变形能力。建立非均匀压力场并用它来形成具有非均匀变形能力的板坯,例如 TWB,可能是一种潜在的解决方案。在这项工作中,对由异质弹性体建立的非均匀压力场和使用该压力场控制 TWB 变形的机制进行了数值研究。具体而言,提出了一种改进的三区域模型来描述基于显微硬度截面分布的 TWB 结构。相应地建立并验证了 TWB 和异质弹性体的有限元模型。异质弹性体的不同分区产生的“较高”和“较低”压力分别用于形成 TWB 的“较强”和“较弱”区域。使用具有不同肖氏硬度比的异质弹性体的成型工艺(ζ) 因为模拟了柔性模具。结果表明,随着ζ,减轻了“弱”侧的过度变形,大大提高了 TWB 的变形均匀性。三个特征区域(即“强”侧、“弱”侧和过渡区域)的应力三轴度同时增加。焊缝及其热影响区 (HAZ) 中的应力局部化也得到缓解。此外,失效分析结果表明,采用最优异质弹性体,在牺牲少量成形极限(-4.34%)的前提下,TWBs的变形均匀性可大幅提高(+19.62%)。

更新日期:2023-03-16
down
wechat
bug