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Strength reduction of foam-core sandwich structures with core mismatches
Journal of Sandwich Structures & Materials ( IF 3.9 ) Pub Date : 2022-07-13 , DOI: 10.1177/10996362221115418
Jacob I Rome, Vinay K Goyal, Dhruv N Patel

Discontinuities in foam-core composite sandwich panels are challenging to assess, in part due to shortcomings in the fundamental understanding of failure processes occurring in the foam. Extensive testing and analysis are frequently required to overcome this lack of understanding when evaluating large-scale structures. This integrated experimental and analytical study investigates the effect of core thickness mismatches on the load carrying capabilities of composite sandwich structures. These mismatches are commonly found in large composite components in aerospace, marine, automotive and other industries and can cause major reductions in sandwich shear strength. Mismatches result from joints between separate pieces of foam core within the sandwich, becoming potential failure initiation sites. Quantifying the reduction in shear strength is difficult due to the complex interaction between the facesheets, butt-joints and core. Sandwich structures containing butt joints are investigated through a research effort that included fabrication, testing, analysis, and nondestructive evaluations. The strength reduction of sandwich beams due to the presence of butt joints is quantified via three-point bend (3PTB) testing for various types of mismatches such as height and thickness of the butt joint. Key mechanical properties of the foam and the lamina are measured through testing and incorporated into analytical models. A stress area approach is proposed as a failure criterion, as test results show this to be promising in predicting the strength reductions measured in the 3PTB testing and the failure initiation site.



中文翻译:

具有芯错配的泡沫芯夹层结构的强度降低

泡沫芯复合夹芯板的不连续性难以评估,部分原因是对泡沫中发生的失效过程的基本理解存在缺陷。在评估大型结构时,经常需要进行广泛的测试和分析来克服这种缺乏理解的问题。这项综合实验和分析研究调查了核心厚度不匹配对复合夹层结构承载能力的影响。这些不匹配常见于航空航天、船舶、汽车和其他行业的大型复合材料部件中,并可能导致夹层剪切强度的大幅降低。不匹配是由夹层中的泡沫芯的不同部分之间的接头导致的,成为潜在的故障起始点。由于面板、对接接头和核心之间的复杂相互作用,很难量化剪切强度的降低。通过包括制造、测试、分析和无损评估在内的研究工作对包含对接接头的夹层结构进行了研究。由于对接接头的存在,夹层梁的强度降低是通过对对接接头的高度和厚度等各种类型的不匹配进行三点弯曲 (3PTB) 测试来量化的。通过测试测量泡沫和薄层的关键机械性能,并将其纳入分析模型。建议采用应力区域方法作为失效准则,因为测试结果表明这在预测 3PTB 测试和失效起始位置测量的强度降低方面是有希望的。

更新日期:2022-07-13
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