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Critical sensitivity in driven nonlinear threshold systems

机译:驱动非线性阈值系统中的临界灵敏度

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Rupture in heterogeneous brittle media, including earthquakes, can be regarded as complicated phenomena in driven nonlinear threshold systems. It displays catastrophe transition and sample-specificity, which results in difficulty of rupture prediction. Our numerical simulations indicate that critical sensitivity might be a common precursor of catastrophe transition and thus give a clue to catastrophe prediction. In this paper we present an analytical examination of critical sensitivity in driven nonlinear threshold systems, based on mean field approximation and damage relaxation time model. The result suggests that critical sensitivity is in reality a common feature prior to catastrophe transition in driven nonlinear threshold systems, with disordered mesoscopic heterogeneity. This result seems to be supported by rock experiments.
机译:在驱动的非线性阈值系统中,包括地震在内的非均质脆性介质中的破裂可被视为复杂现象。它显示了突变转变和样品特异性,从而导致破裂预测的困难。我们的数值模拟表明,临界灵敏度可能是灾难转变的常见先兆,因此为突变预测提供了线索。在本文中,我们基于平均场近似和损伤松弛时间模型,对驱动的非线性阈值系统中的临界灵敏度进行了分析检查。结果表明,在驱动的非线性阈值系统中,具有无感的介观异质性,临界灵敏度实际上是灾难转变之前的常见特征。岩石实验似乎证明了这一结果。

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