Boulbitch A, Korzhenevskii A L
IEE S.A. ZAE Weiergewan, 11, rue Edmond Reuter, L-5326 Contern, Luxembourg.
Institute for Problems of Mechanical Engineering, RAS, Bol'shoi prosp. V. O. 61, 199178 St. Petersburg, Russia.
Phys Rev E. 2016 Jun;93(6):063001. doi: 10.1103/PhysRevE.93.063001. Epub 2016 Jun 7.
We study a concerted propagation of a fast crack with the process zone where a rearrangement of the solid structure takes place. The latter is treated as a second-order local phase transformation. We demonstrate that the propagation of such a zone gives rise to a nonlinear frictionlike force exerted on the crack tip, resisting its propagation. Depending on the temperature, it produces three regimes of crack motion, which differ in the behavior of the crack tip process zone: (i) always existing, (ii) only emerging at a high crack speed, and (iii) flickering. We show that the latter regime exhibits crack velocity jumps.
我们研究了快速裂纹与发生固体结构重排的过程区的协同扩展。后者被视为二阶局部相变。我们证明，这样一个区域的扩展会产生作用于裂纹尖端的非线性摩擦类力，阻止其扩展。根据温度的不同，它会产生三种裂纹运动状态，这三种状态在裂纹尖端过程区的行为上有所不同：（i）始终存在，（ii）仅在高裂纹速度下出现，以及（iii）闪烁。我们表明，后一种状态表现出裂纹速度跳跃。
