The influence of grain size and strain rate effects on formability of aluminium alloy sheet at high-speed forming

Tung Chen Cheng, Rong-Shean Lee

研究成果: Article同行評審

15 引文 斯高帕斯(Scopus)

摘要

In order to investigate the coupling influence of grain size and strain rate on formability, a series of limit dome height (LDH) tests were conducted at four different speeds ranging from 0.012 m/s to 11.04 m/s via stamping and electro-magnetic forming process. Aluminium sheets A5052 H32 with 0.5 mm thickness were used for experiments and annealed in different conditions to obtain different micro-structures (T/D = 6.99–27.17). The strain data of FLD were compared with the limit dome height measurement to clarify the influence of various grain sizes on formability. Furthermore, the fracture surface and microstructure of tested samples were observed by SEM and OM to understand the damage mode. The results show that the influence of decreased grain size at high-speed forming not only enhances material strength but also increases the probability of grain boundary fracture that could impair the formability. This new finding can be used in predicting the occurrence of fracture and as a reference for product design and processing simulation analysis.

原文English
頁(從 - 到)134-159
頁數26
期刊Journal of Materials Processing Technology
253
DOIs
出版狀態Published - 2018 3月 1

All Science Journal Classification (ASJC) codes

  • 陶瓷和複合材料
  • 電腦科學應用
  • 金屬和合金
  • 工業與製造工程

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