2003, Volume 5, Issue 3
Strategic Study of CAE >> 2003, Volume 5, Issue 3
Shock Tensile Behaviour of Tungsten Alloy and Presentations to Its Constitutive Models and Fracture Criterion
Department of Mechanical Engineer, Beijing Institute of Technology, Beijing 100081, China
Next Previous
Abstract
The shock tensile stress-strain curves of 93% wt. tungsten alloy at different strain rates εand different temperatures T were measured experimentally by use of a Hopkinson tensile bars equipment. Based on these experimental data, two constitutive models were proposed to represent the shock tensile behavior of this alloy. Besides, a linear relation between the critical strain ε1 of plastic instability and the plastic work W1 at the maximum load-onset of instability was derived, so that the criterion of shock tensile fracture of the material is given in this paper. The fractal analysis to the tensile fracture was made which gives a strong support to the conclusions obtained from the macro-experimental results.
Figures
图1
图2
图3
图4
图5
图6
图7
图8
图9
图10
图11
图12
图13
图14
图15
图16
图17
图18
References
[ 1 ] Tham R,Stilp A J.Dynamic strength calculations of W-alloys based on grain deformation[J].Journal De Physique,1988,C3-85(Tom-47):9
[ 2 ] Rabin B H,German R M.Microstructure effects on tensile properties of W-Ni-Fe composites[J].Metall Trans,A,1988,19a:1523~1532
[ 3 ] Weerasooriya T, Beaulieu P A, Swanson R. Deformation and failure of 93W-5Ni-2Fe at high strain rate shear loading[R].AD-A251345,1992
[ 4 ] Zhang B P,Yang C,Xiong Y M,et al. Responsive behavior of 93wt.% tungsten alloy under the intense shock loading[A].Proc of IUTAM Symp on Impact Dyn[C].Peking University Press,1994.270~283
[ 5 ] Bodner S R,Parton Y. Large deformation elastic-viscoplastic analysis of a thick-walled spherical shell [J].J Appl Mech,1972,39:751~757
京公网安备 11010502051620号
