Fracture-induced thermal decomposition in brittle crystalline solids
Fracture-induced thermal decomposition in brittle crystalline solids
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脆性结晶固体中断裂引起的热分解
DOI：
10.1098/rspa.1970.0103
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发表时间：
1970
期刊：
影响因子：
--
通讯作者：
J. Soria
中科院分区：
文献类型：
--
作者：
Patricia G Fox;J. Soria
对快速解理裂纹穿过脆性结晶固体时释放的弹性应变能所产生的热分解进行了实验研究。测定了钙、镁、铅碳酸盐以及钠和叠氮化铅晶体中解理的分解量。通过将这些量与单独测量的每种材料的断裂速度和热分解动力学相关联，得出了每种情况下的裂纹尖端温度图。讨论了这一温度的意义及其与在固体中产生快速自持反应的可能性的关系。裂纹温度的相对大小可以半定量地与材料的塑性性能有关，这是通过测量材料在解理面上的压痕硬度得出的。最后，以有机化合物季戊四醇四硝酸酯为例，说明了用这种方法分解一个更复杂的分子的情况。因此，破裂应该伴随着这样的现象，如温度的大幅上升表明能量的耗散……“A·A·格里菲斯(1920)
An experimental study has been made of the thermal decomposition produced by the release of elastic strain energy when a fast cleavage crack runs through a brittle crystalline solid. The amounts of decomposition are measured for cleavages in crystals of calcium, magnesium, and lead carbonates and sodium and lead azides. By relating these amounts to the fracture velocity and the kinetics of thermal decomposition of each material measured independently, a figure for the crack tip temperature is deduced in each case. The significance of this temperature and its relevance to the possibility of generating fast self-sustaining reactions in solids are discussed. The relative magnitudes of the crack temperatures can be semi-quantitatively related to the plastic properties of the material as deduced from measurements of their indentation hardness on the cleavage plane. Finally the decomposition of a more complex molecule by this method is illustrated for the case of the organic compound pentaerythritol tetranitrate. ‘Hence, rupture should be accompanied by phenomena such as a large rise in temperature indicative of the dissipation of an amount of energy... ’ A. A. Griffith (1920)