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Spall-Fracture Physics and Spallation-Resistance-Based Material Selection

机译:层间断裂物理与基于层间抗裂的材料选择

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Spallation is a fracture mode commonly observed in ballistically/blast-wave-loaded structures. The interaction between decompression waves generated within the target structure produces tensile stresses which, if of a sufficient magnitude, may cause material damage and ultimate fracture (spallation). In this study, the phenomenon of spall-fracture is analyzed within a one-dimensional Lagrangian framework. Two distinct analyses are carried out. Within the first analysis, decompression waves are treated as decompression shocks, which simplified the analysis and enabled the formation of spallation-strength-based material index. In the second analysis, decompression waves are treated as smooth (centered simple) waves. This increased the fidelity of the computational analysis, but the material-selection procedure could be done only numerically and an explicit formulation of the spallation-strength-based material-selection index could not be carried out. Overall, the two analyses yielded similar results for the spallation-strength-based material-selection criterion suggesting that the simpler (decompression shock based) one is still adequate for use in the material-selection process.
机译:散裂是在弹道/爆炸波荷载结构中通常观察到的断裂模式。在目标结构内产生的减压波之间的相互作用会产生拉伸应力,如果拉伸应力的大小足够大,则可能导致材料损坏和最终断裂(松脱)。在这项研究中,在一维拉格朗日框架内分析了剥落破裂现象。进行了两个不同的分析。在第一个分析中,减压波被视为减压震荡,从而简化了分析并形成了基于散裂强度的材料指数。在第二个分析中,减压波被视为平滑(居中简单)波。这增加了计算分析的保真度,但是只能以数字方式进行材料选择过程,而不能对基于散裂强度的材料选择指数进行明确的表述。总体而言,对于基于散裂强度的材料选择标准,这两项分析得出了相似的结果,表明较简单(基于减压冲击)的材料仍然足以用于材料选择过程。

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