Thermally dissipated energy from periodic mechanical action can lead to the creation of areas of intense, localized heating in heterogeneous composite materials, called hot spots. Measurements of hot spots have been performed in shock, impact, and friction studies of energetic materials, amongst others. In this work, high-frequency contact loading allows for the controlled development of hot spots near explosive crystals embedded in polymer with temperature gradients suitable for shadowgraph visualization. Heat dissipation initiated the delamination of crystal-binder interfaces, which led to increased heating from interfacial motion and further delamination propagation. A variety of explosives were considered. Low melting point explosives were driven to reaction despite a hypothesized reduction in interfacial friction upon melting, and crystals with controlled surface morphology still experienced damage. Shadowgraphy allows nonintrusive access to internally developing hot spots which, in turn, enables the identification of heat generation mechanisms to inform our understanding of explosive initiation.

周期性机械作用产生的热耗散能量会导致在异质复合材料中产生强烈的局部加热区域，称为热点。热点的测量已在高能材料的冲击、冲击和摩擦研究中进行，等等。在这项工作中，高频接触载荷允许在聚合物中嵌入爆炸性晶体附近的热点的受控发展，温度梯度适合阴影图可视化。散热引发了晶体 - 粘合剂界面的分层，这导致界面运动产生的热量增加和进一步的分层传播。考虑了各种炸药。尽管假设熔化时界面摩擦减少，但低熔点炸药仍被驱使反应，并且具有受控表面形态的晶体仍然受到损坏。Shadowography 允许非侵入式访问内部发展的热点，这反过来又能够识别发热机制，以告知我们对爆炸引发的理解。