在压缩纳米多孔材料的声发射中无临界失效的加速地震释放的实验证据
Experimental evidence of accelerated seismic release without critical failure in acoustic emissions of compressed nanoporous materials
摘要：
当材料接近宏观破坏时，声发射事件的总能量发生发散。数值和概念模型解释了这种加速地震释放（ASR）的方法与最终失败相一致的临界点。在这里，我们报告ASR在软单轴压缩的三个硅基（SiO $_2$）纳米多孔材料。而不是一个单一的临界点，AE能量的分布是固定的，在活动率的变化是足以解释的ASR导致不同的脆性破坏事件的多个周期的存在。我们建议，临界故障被抑制在AE统计耗散和瞬态硬化。从实验中估计的一些临界指数是兼容的平均场模型，而其他人仍然是开放的解释摩擦和断裂雪崩模型的解决方案。
英文摘要：
The total energy of acoustic emission (AE) events in externally stressed materials diverges when approaching macroscopic failure. Numerical and conceptual models explain this accelerated seismic release (ASR) as the approach to a critical point that coincides with ultimate failure. Here, we report ASR during soft uniaxial compression of three silica-based (SiO$_2$) nanoporous materials. Instead of a singular critical point, the distribution of AE energies is stationary and variations in the activity rate are sufficient to explain the presence of multiple periods of ASR leading to distinct brittle failure events. We propose that critical failure is suppressed in the AE statistics by dissipation and transient hardening. Some of the critical exponents estimated from the experiments are compatible with mean field models, while others are still open to interpretation in terms of the solution of frictional and fracture avalanche models.
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