期刊
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
卷 17, 期 4, 页码 446-465出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/1099636215577367
关键词
Compression after impact; sandwich panels; digital image correlation; residual strength; failure mechanism
类别
资金
- China Postdoctoral Science Foundation [2014M551481]
This paper presents the experimental results pertaining to the deformation, failure mode, failure mechanism and residual strength for the compression-after-impact tests of woven polymer-based foam-core sandwich panels. Sandwich panels with impact-type damage, inflicted via low-velocity impact, were tested to failure in compression. The optical strain measurement system ARAMIS was used to obtain the complete non-uniform strain and displacement fields of the damaged face-sheet. Consequently, damage in the face-sheets was characterized by fractography. It has been found that the dominant damage mechanism is kink band in the impacted face-sheets due to fiber plastic micro-buckling. Besides, the effects of impactor diameter, impact energy, face-sheet thickness and foam core thickness on the residual strength under in-plane compressive loading were studied. This study will be useful for characterizing and predicting the residual compressive strength and understanding the failure mechanism of woven polymer-based foam-core sandwich panel.
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