Imperfection sensitivity of in-plane modulus for hierarchical honeycombs
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摘要: 针对正六边形、Kagome和正三角形蜂窝，通过在孔壁表面附着弱材料层，提出了一种多层级蜂窝材料，并采用解析计算和数值计算的方法，围绕孔壁缺失这种最恶劣的缺陷类型，对蜂窝的体模量和剪切模量进行分析。结果表明，附着软层的多层级蜂窝材料比传统蜂窝抗缺陷性能提高，表现出较低的缺陷敏感性。在附着层的杨氏模量和原蜂窝材料比模量相同时，尽管附着层的杨氏模量比蜂窝母材低一个量级，但在附着层厚度是原蜂窝壁厚两倍时，正六边形和Kagome蜂窝的面内模量对缺陷的敏感性都明显降低。Abstract: A hierarchical honeycomb material with soft adhesion layer being added to its walls was studied based on hexagonal honeycomb, Kagome honeycomb and triangular honeycomb. Using analytical calculation and numerical simulation method, the bulk modulus and shear modulus of hierarchical structure honeycomb with missing walls were given out. It presents that hierarchical structure honeycomb shows a low level of imperfection sensitivities compared with classic honeycomb. When the adhesion layer has the same specific modulus and twice the thickness of the core layer's but an order of magnitude lower modulus than the core layer's, the hexagonal honeycomb and Kagome honeycomb's imperfection sensitivities are significantly reduced.
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