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首页> 外文期刊>Geophysical Research Letters >Can flash heating of asperity contacts prevent melting?
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Can flash heating of asperity contacts prevent melting?

机译：粗糙触点的瞬间加热可以防止熔化吗？

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摘要

We solve the elasto-dynamic problem for a 3-D rupture, spontaneously propagating on a fault, obeying rate- and state-dependent friction. We explore, through numerical simulations with physically realistic constitutive parameters, the effects on dynamic traction evolution of the flash heating of microscopic asperity contacts. Our results demonstrate that the inclusion of flash heating tends to increase the degree of instability of a homogeneous fault:the supershear rupture regime is favored, significantly larger stress drops are realized and weakening distance and fracture energy increase. We show that the key parameter which controls the temperature evolution and the activation of the flash heating is the slipping zone width, 2w. We found that for localized shear the rupture exhibits a pulse-like behavior. On the contrary, for large slipping zones, the rupture develops as a sustained crack. Finally, we show that flash heating enhances the onset of melting.
机译：我们解决了3D破裂的弹性动力学问题，自发地在断层上传播，并遵循与速率和状态有关的摩擦。我们通过具有物理逼真的本构参数的数值模拟，探索了微观粗糙接触对闪加热的动态牵引演化的影响。我们的研究结果表明，包括闪蒸加热往往会增加均质断层的不稳定性程度：有利于采用超剪切断裂机制，实现了明显更大的应力下降，并且削弱了距离并增加了断裂能。我们表明，控制温度变化和闪蒸加热激活的关键参数是滑移区宽度2w。我们发现，对于局部剪切，破裂表现出脉冲状行为。相反，对于较大的滑动区域，破裂会持续发展。最后，我们证明了快速加热会增强熔化的开始。

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