Abstract Practical, cost-effective strategies are of interest for the protection of vulnerable infrastructure against dynamic load events such as blast and fragment impact. Recent research has established that spray-on elastomer coatings can provide a significant impact mitigating effect when applied to concrete structural elements [1]. However, to date, no practical design guidelines exist to support efficient implementation of this retrofit solution. In this work, an analytical model is proposed for the impact indentation of an elastomer-coated concrete structural element. Design maps are produced, predicting the critical projectile impact velocities for elastomer failure and concrete failure, taking the coating thickness and elastomer modulus as the key design variables. The analytical predictions provide a close match to experimental and finite element analysis (FEA) results [ 1 , 2]. Spanning a realistic range of elastomer moduli, representative of typical spray application polymers, a regime change is predicted that depends only on the elastomer modulus, Ee. For Ee 50 MPa, the concrete is predicted to fail first and in this regime, the critical velocities are most sensitive to he compared with Ee.

中文翻译：

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用于减轻混凝土冲击损伤的弹性体涂层设计

摘要 实用且具有成本效益的策略对于保护易受攻击的基础设施免受动态负载事件（例如爆炸和碎片撞击）的影响非常重要。最近的研究已经确定，喷涂弹性体涂层在应用于混凝土结构元件时可以提供显着的减轻影响的效果 [1]。然而，迄今为止，还没有实用的设计指南来支持这种改造解决方案的有效实施。在这项工作中，提出了一种用于弹性体涂层混凝土结构元件的冲击压痕的分析模型。生成设计图，预测弹性体破坏和混凝土破坏的临界弹丸冲击速度，将涂层厚度和弹性体模量作为关键设计变量。分析预测提供了与实验和有限元分析 (FEA) 结果的密切匹配 [1, 2]。跨越一个实际的弹性模量范围，代表典型的喷涂应用聚合物，预测仅取决于弹性体模量 Ee 的状态变化。对于 Ee 50 MPa，预计混凝土将首先失效，在这种情况下，与 Ee 相比，临界速度对 he 最敏感。