Forming defects control in transitional region during isothermal local loading of Ti-alloy rib-web component
Forming defects control in transitional region during isothermal local loading of Ti-alloy rib-web component
复制标题
钛合金筋腹板构件等温局部加载过渡区成形缺陷控制
DOI：
10.1007/s00170-014-6317-2
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发表时间：
2015-02
影响因子：
3.4
通讯作者：
Penghui Lei
中科院分区：
文献类型：
--
作者：
Pengfei Gao;He Yang;Xiaoguang Fan;Penghui Lei
过渡区的成形质量对钛合金大型筋板构件等温局部加载成形性能起着关键作用。本文提出了一种大型筋板构件局部加载成形过渡区的局部特征模型，以较低的仿真计算量和实验成本，较好地捕捉过渡区的细节成形特征。然后，基于局部特征模型，采用物理实验和有限元模拟相结合的方法，研究了过渡区缺陷的形成机理及其与工艺参数的关系。研究发现，第二加载阶段按材料流动形态可分为两个成形阶段：（1）横向流动阶段和（2）稳定成形阶段。在横向流动阶段，纸幅材料存在长距离的横向流动，过度的横向流动会导致折叠和空腔缺陷的形成。此外，缺陷的严重程度与在此阶段转移到第一加载区域的材料的量有很好的相关性。在一定的压下量下，减小垫块厚度和增大摩擦力均能减少材料转移量，从而抑制折叠和空洞缺陷的产生，而变形温度和加载速度对材料转移量和缺陷的产生影响不大。最后，提出了一种有效抑制和防止钛合金大型筋板构件局部加载成形过程中过渡区缺陷的方法。
The forming quality of transitional region plays a key role in the performance of titanium alloy large-scale rib-web component under isothermal local loading forming. In this work, a local eigen model of transitional region in the local loading forming of large-scale rib-web component is extracted so as to catch the detail-forming characteristics of transitional region with low computation time in simulation and experiment cost. Then, based on the local eigen model, the mechanism of forming defects in transitional region and their dependence on processing parameters are studied by the combination of physical experiment and verified finite element (FE) simulation. It is found that the second loading step can be divided into two forming stages according to the material flow pattern: (1) the transverse flow stage and (2) the stable forming stage. In the transverse flow stage, there exists long-range transverse flow of web material and excessive transverse flow would lead to the formation of folding and cavum defects. Moreover, the severities of defects are well correlated with the quantity of material transferred into the first-loading region in this stage. For a certain reduction amount, decreasing spacer block thickness and increasing friction both can decrease the quantity of transferred material and then suppress the development of folding and cavum defects, while the deformation temperature and loading speed have little effect on the quantity of transferred material and defects. In the end, an effective way is put forward to suppress and prevent the defects in transitional region during the local loading forming of titanium alloy large-scale rib-web component.
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DOI：
10.1007/s00170-013-4925-x
发表时间：
2013-04
期刊：
The International Journal of Advanced Manufacturing Technology
影响因子：
--
作者：
Dawei Zhang;He Yang
通讯作者：
Dawei Zhang;He Yang
DOI：
10.1007/s00170-008-1806-9
发表时间：
2009-05
期刊：
The International Journal of Advanced Manufacturing Technology
影响因子：
--
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Feng Li;J. Lin;S. Yuan;Xiao Jing Liu
通讯作者：
Feng Li;J. Lin;S. Yuan;Xiao Jing Liu
DOI：
--
发表时间：
2009
期刊：
--
影响因子：
--
作者：
Zhichao Sun;H. Yang
通讯作者：
Zhichao Sun;H. Yang
DOI：
10.1007/s00170-010-3023-6
发表时间：
2011-07
期刊：
The International Journal of Advanced Manufacturing Technology
影响因子：
--
作者：
J. Zhou;Feng Wang;Menghan Wang;Wujiao Xu
通讯作者：
J. Zhou;Feng Wang;Menghan Wang;Wujiao Xu
影响因子：
6.3
作者：
Abhijit Dutta;A. Rao
通讯作者：
Abhijit Dutta;A. Rao