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首页> 外文期刊>International Journal of Solids and Structures >THE EFFECT OF ALIGNED DEFECTS ON THE PROPAGATION SPEED OF A DYNAMIC CRACK IN PMMA
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THE EFFECT OF ALIGNED DEFECTS ON THE PROPAGATION SPEED OF A DYNAMIC CRACK IN PMMA

机译：对齐缺陷对PMMA中动态裂纹扩展速度的影响

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摘要

Following earlier observations of multiple micro-crack formation accompanying crack propagation under dynamic conditions, the question regarding the discrepancy between the ''theoretically anticipated'' maximal crack (Rayleigh wave) speed and those observed typically in amorphous, isotropic solids is examined experimentally. It is shown that if the production of these multiple micro-cracks ahead of the main fracture is suppressed by fabricating a material possessing a thin uniform region of vanishing intrinsic (molecular/atomic) material strength the crack speed is materially increased to the point of approaching the Rayleigh wave speed. Moreover, it is also shown that the presence of small discreet flaws of sufficient spatial density similarly ''weakens'' the material to produce fracture speeds comparable with the Rayleigh wave speed. One deduces, therefore, that for a single crack front the linearized theory of elastodynamics correctly predicts the dynamic crack propagation behavior of a solid with sufficiently low material strength. [References: 34]
机译：在早期观察到在动态条件下伴随裂纹扩展而出现的多个微裂纹形成之后，通过实验研究了有关“理论上预期的”最大裂纹（瑞利波）速度与通常在非晶质各向同性固体中观察到的速度之间的差异的问题。结果表明，如果通过制造具有薄的均匀区域的固有（分子/原子）材料强度消失的材料来抑制在主断裂之前产生多个微裂纹，则裂纹速度将显着提高至接近瑞利波的速度。此外，还表明存在足够空间密度的细小离散缺陷会“弱化”材料，以产生与瑞利波速相当的断裂速度。因此，有人得出结论，对于单个裂纹前沿，弹性动力学线性化理论正确地预测了具有足够低材料强度的固体的动态裂纹扩展行为。 [参考：34]

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