Impact-induced transition from damage to perforation

被引:0
|
作者
Batool, Attia
Pal, Gergo
Kun, Ferenc [1 ]
机构
[1] Univ Debrecen, Fac Sci & Technol, Doctoral Sch Phys, Dept Theoret Phys, POB 400, H-4002 Debrecen, Hungary
关键词
FRACTURE; DISORDER; RUPTURE;
D O I
10.1103/PhysRevE.102.042116
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
We investigate the impact-induced damage and fracture of a bar-shaped specimen of heterogeneous materials focusing on how the system approaches perforation as the impact energy is gradually increased. A simple model is constructed which represents the bar as two rigid blocks coupled by a breakable interface with disordered local strength. The bar is clamped at the two ends, and the fracture process is initiated by an impactor hitting the bar in the middle. Our calculations revealed that depending on the imparted energy, the system has two phases: at low impact energies the bar suffers damage but keeps its integrity, while at sufficiently high energies, complete perforation occurs. We demonstrate that the transition from damage to perforation occurs analogous to continuous phase transitions. Approaching the critical point from below, the intact fraction of the interface goes to zero, while the deformation rate of the bar diverges according to power laws as function of the distance from the critical energy. As the degree of disorder increases, farther from the transition point the critical exponents agree with their zero disorder counterparts; however, close to the critical point a crossover occurs to a higher exponent.
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页数:9
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