Abstract
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 0.012m/s to 11.04m/s via stamping and electro-magnetic forming process. Aluminium sheets A5052 H32 with 0.5mm 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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
