“Segment-wise model” for theoretical simulation of barely visible indentation damage in composite sandwich beams: Part II – Experimental verification and discussion
“Segment-wise model” for theoretical simulation of barely visible indentation damage in composite sandwich beams: Part II – Experimental verification and discussion
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DOI：
10.1016/j.compositesa.2007.08.007
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发表时间：
2007-12
影响因子：
8.7
通讯作者：
S. Minakuchi;Y. Okabe;N. Takeda
中科院分区：
文献类型：
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作者：
S. Minakuchi;Y. Okabe;N. Takeda
当局部横向载荷作用在夹层结构上时，夹层局部变形，芯部破碎。由芯部挤压引起的残余凹陷显著地降低了夹层结构的机械性能。在以前的论文中，作者建立了一个“分段模型”的理论模拟几乎不可见的压痕损伤的蜂窝夹层梁与复合材料面板。根据蜂窝结构的周期性形状，将蜂窝夹层梁划分为多段，每一段都考虑了芯层的复杂厚度特性。本文通过不同类型蜂窝芯试件的试验验证了新模型的正确性。此外，从核对基体反作用力的角度阐明了压痕载荷下的损伤扩展机理。该模型的适用性，以其他类型的核心材料进行了讨论。
When localized transverse loading is applied to a sandwich structure, the facesheet locally deflects and the core crushes. A residual dent induced by the core crushing significantly degrades the mechanical properties of the sandwich structure. In a previous paper, the authors established a “segment-wise model” for theoretical simulation of barely visible indentation damage in honeycomb sandwich beams with composite facesheets. Honeycomb sandwich beam was divided into many segments based on the periodic shape of the honeycomb and complicated through-thickness characteristics of the core were integrated into each segment. In this paper, the new model is validated by experiments using specimens with different types of honeycomb cores. In addition, the damage growth mechanism under indentation load was clarified from the viewpoint of the reaction force from the core to the facesheet. The applicability of the model to other types of core materials is also discussed.