Strength reduction of foam-core sandwich structures with core mismatches

IF 3.5 3区 材料科学 Q1 ENGINEERING, MECHANICAL
Jacob I. Rome, V. Goyal, D. Patel
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引用次数: 1

Abstract

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.
芯错配泡沫-芯夹层结构的强度折减
泡沫芯复合材料夹层板的不连续性很难评估,部分原因是对泡沫中发生的破坏过程缺乏基本的理解。在评估大型结构时,经常需要广泛的测试和分析来克服这种理解的缺乏。本文采用实验与分析相结合的方法,研究了芯材厚度错配对复合材料夹层结构承载能力的影响。这些不匹配通常出现在航空航天、船舶、汽车和其他行业的大型复合材料部件中,并可能导致夹层抗剪强度大幅降低。夹层内不同泡沫芯片之间的接头导致失配,成为潜在的失效起始点。由于面板、对接节点和岩心之间复杂的相互作用,难以量化抗剪强度的降低。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。通过三点弯曲(3PTB)测试,对各种类型的不匹配(如对接接头的高度和厚度)进行量化,确定了由于对接接头存在而导致的夹层梁的强度降低。泡沫和层的关键力学性能是通过测试测量,并纳入分析模型。试验结果表明,应力区方法在预测3PTB试验中测量的强度降低和破坏起始部位方面有希望,因此提出了应力区方法作为破坏准则。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Sandwich Structures & Materials
Journal of Sandwich Structures & Materials 工程技术-材料科学:表征与测试
CiteScore
9.60
自引率
2.60%
发文量
49
审稿时长
7 months
期刊介绍: The Journal of Sandwich Structures and Materials is an international peer reviewed journal that provides a means of communication to fellow engineers and scientists by providing an archival record of developments in the science, technology, and professional practices of sandwich construction throughout the world. This journal is a member of the Committee on Publication Ethics (COPE).
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