Code from Thermo-chemo-mechanically coupled cavity dynamics and the emergence of multi-phase bursts

Understanding the dynamics induced by confined thermo-chemical processes occurring inside a solid medium, is a fundamental problem of interest in several applications, such as hot-spot formation and micro-explosions in energetic materials and laser-induced cavitation for energy focusing and material characterization. In recent years, advanced experimental capabilities have uncovered elusive behaviours in such systems, including temperature spikes that emerge at short timescales, and multi-phase explosions. By coupling the mechanics of the solid, the thermodynamics, and the chemical kinetics of the decomposition reactions, the theoretical model developed here explains and demonstrates these phenomena. The dimensionless response of the system is studied numerically and analytical expressions for the mechanical response limits are derived. These results should be useful in guiding future experiments and in explaining phenomena that may emerge at various length and time scales.

探究固体介质内部受限热化学过程所引发的动力学行为，是诸多应用领域中的核心基础问题，例如含能材料中的热点形成与微爆炸，以及用于能量聚焦与材料表征的激光诱导空化现象。近年来，先进的实验技术手段揭示了这类体系中诸多此前难以观测到的行为，包括短时间尺度内出现的温度尖峰与多相爆炸现象。本文提出的理论模型通过耦合固体力学、热力学与分解反应的化学动力学，对上述现象进行了解释与重现。本研究对体系的无量纲响应开展了数值分析，并推导得到了力学响应极限的解析表达式。上述研究成果可为后续实验提供指导，同时有助于解释不同时空尺度下可能出现的各类现象。