高速传播裂缝尖端附近的温升与震时地光现象

TEMPERATURE RISE NEAR A RAPIDLY RUNNING CRACK TIP AND THE PHENOMENON OF LIGHTNING AT THE TIME OF AN EARTHQUAKE

摘要:

许多解释震时发光的物理机制都以地震裂缝高速传播时产生很高的温升为条件。本文从弹塑性断裂动力学的理论出发研究了传播的裂缝尖端附近的温度场。数值结果表明,地震时传播裂缝尖端附近可产生几百度至近千度的温升。

Abstract:

A lot of physical mechanism explaining earthquake lightning depends on the condition of high temperature rise when an earthquake crack propagating. This work has studied the temperature fields near a running crack tip from the theory of dynamic fracture mechanics. The numerical results have shown that when an earthquake is occurring, the temperature rise near the propagating crack tip may reach several hundred to near one thousand degree.