Abstract Better predictive models of mechanical failure in low-weight heat shield composites would aid material certification for missions with aggressive atmospheric entry conditions. Here, we develop such a model for the rapid engineering analysis of the failure limits of phenolic impregnated carbon ablator (PICA) - a leading heat shield material whose structural component is a carbon fiber network. We hypothesize inelastic deformation failure mechanisms and model their behavior using molecular dynamics simulations to calculate the binding energy. We then upscale this binding energy to the macroscale using a renormalization argument. The approach delivers insightful and reasonably accurate macroscale predictions that compare favorably to experiments. In application, the model is validated for a particular variety of PICA by comparison to experiment and would then be used to study design scenarios in different entry conditions.

中文翻译：

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碳纤维网络的多尺度内聚律

摘要 低重量隔热复合材料中更好的机械故障预测模型将有助于材料认证用于具有侵蚀性大气进入条件的任务。在这里，我们开发了这样一个模型，用于对酚醛浸渍碳烧蚀剂 (PICA) 的失效极限进行快速工程分析，PICA 是一种领先的隔热材料，其结构部件是碳纤维网络。我们假设非弹性变形破坏机制并使用分子动力学模拟来模拟它们的行为以计算结合能。然后我们使用重整化参数将这种结合能提升到宏观尺度。该方法提供了有见地且相当准确的宏观预测，与实验相比具有优势。在应用中，