Rhodes E F, Thornton J I
J Forensic Sci. 1975 Apr;20(2):274-82.
While this study was not exhaustive of the area of impact fractures in glassy polymers, it does demonstrate that there are some significant differences between fractures in polymers and those encountered with glass. Those differences can be summarized as follows: (1) the occurrence of pronounced, highly curved hackle marks, which could in many instances be mistaken for conchoidal marks;(2)the appearance of the beveled edges bordering the cratering on the side opposite origin of force; and (3) a more apparent tendency toward an inverse relationship of muzzle velocity and energy to radial fracture length and degree of curving along crater boundaries. The physical laws applicable to the fracture of glass are identical to those extant in the fracture of glassy polymers; no new forces are at play. All of the differences are capable of being explained in terms of the differences in flexibility and flow between glass and polymers, and the resulting differences in tension development and fracture propagation.
虽然本研究并未详尽涵盖玻璃态聚合物中冲击断裂的领域，但它确实表明，聚合物中的断裂与玻璃中的断裂存在一些显著差异。这些差异可总结如下：（1）出现明显的、高度弯曲的劈裂痕，在许多情况下可能被误认为贝壳状痕；（2）在与力的作用点相对的一侧，与凹坑相邻的边缘呈斜面状；（3）枪口速度和能量与径向断裂长度以及沿凹坑边界的弯曲程度之间更明显地呈现出反比关系。适用于玻璃断裂的物理定律与玻璃态聚合物断裂中存在的定律相同；不存在新的作用力。所有这些差异都能够根据玻璃和聚合物在柔韧性和流动性方面的差异，以及由此在张力发展和断裂扩展方面产生的差异来解释。
