An elastic-viscoplastic based finite element model has been developed to study the necking behavior of tube expansion for rate independent materials, rate dependent monolithic materials, and laminated materials during dynamic loading. A numerical study shows that for rate independent materials, the dynamic loading will not delay diffused necking but localized necking; for rate dependent materials, high strain rate sensitivity can significantly delay the onset of localized necking for both monolithic and laminated sheets and affect the multiple-neck formation in high-speed dynamic loading. The model also shows that a higher volume fraction of a clad layer with positive rate sensitivity material in a laminated sheet improves the sheet ductility.
Effect of Rate Sensitivity on Necking Behavior of a Laminated Tube Under Dynamic Loading
Hamilton, ON L8S 4L7,
Kingston, ON K7L 5L9,
System and Vibration,
School of Mechanical and Power
Shanghai Jiao Tong University,
Shanghai 200240, China
Manuscript received August 29, 2013; final manuscript received October 25, 2013; accepted manuscript posted October 28, 2013; published online December 13, 2013. Editor: Yonggang Huang.
Shi, Y., Wu, P. D., Lloyd, D. J., and Li, D. Y. (December 13, 2013). "Effect of Rate Sensitivity on Necking Behavior of a Laminated Tube Under Dynamic Loading." ASME. J. Appl. Mech. May 2014; 81(5): 051010. https://doi.org/10.1115/1.4025839
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