7075-T651铝合金靶板剪切冲塞的试验和数值模拟研究

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Abstract To reveal the necessity to introduce Lode angle into a fracture criterion, tests on a one-stage light gas gun were conducted for rigid flat-headed projectiles penetrating 7075-T651 aluminum alloy targets to obtain the targets’ fracture behavior and ballistic limit.Through round bar tensile tests and flat plate shear ones, Johnson-Cook (JC) constitution model, fracture criterion parameters and a Lode angle-dependent fracture criterion were calibrated.Adopting ABAQUS finite element software, 3-D numerical simulations were done for the tests using Lode angle-dependent fracture criterion and Lode angle-independent one, respectively.The results showed that 7075-T651 aluminum alloy targets penetrated by rigid flat-headed projectiles have shear plugging damages; 7075-T651 aluminum alloy targets’ fracture is correlated to Lode parameters, in shear band, the initial failure material’s stress tri-axiality is below 0 and Lode angle is close to 0, JC fracture criterion calibrated with round bar tensile tests over-estimates the targets’ fracture strain; fracture behavior of the targets predicted with JC fracture criterion is quite different from that in tests, the ballistic limit simulated is 42% higher than the test value; while the ballistic limit simulated using Lode angle-dependent fracture criterion agrees well with the test value.

Key words： shear plugging Lode parameter Johnson-Cook fracture criterion ballistic limit numerical simulation

Received: 03 April 2018 Published: 28 January 2019

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	XIAO Xinke1
	CHEN Lin1
	2
	DU Taisheng1
	2

Cite this article:

XIAO Xinke1,CHEN Lin1,2, et al. Tests and numerical simulation for shear plugging of 7075-T651 aluminium alloy targets[J]. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(3): 51-58.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2019/V38/I3/51

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