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Proceedings Paper

Prediction of impact damage on stitched sandwich composite panels
Author(s): Xitao Zheng; Linhu Gou; Xiaoxia Zheng; Jianfeng Zhang
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Paper Abstract

Based on the analysis of experiments, the damage of composite stitched foam-core sandwich structure under low-velocity impact has been studied in this paper. A numerical simulation is performed to predict the effects of stitching on the low-velocity impact response of stitched sandwich composite panels. The results of numerical simulation show that the damage areas of upper face sheet are greater than the lower one for both unstitched and stitched sandwich, however, the main patterns of damage are different. For the unstitched structure, the upper face sheet's damage is the main pattern of damage, whereas the crushing damage is the stitched one's main damage. The finite element results have corresponded well with the experimental results, which prove the correctness of the finite element model. The results indicate that stitching does not increase the load at which delamination begins to propagate, but greatly reduces the extent of delamination growth at the end of the impact event. Then, the damage areas' change has been taken into consideration as some factors change, those various factors include the impact energy, the thickness of upper panel, the thickness of foam core and the stitched density (stitched row spacing×needle spacing, suture thickness). And also it presents some related theoretical analysis.

Paper Details

Date Published: 20 October 2009
PDF: 7 pages
Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74931J (20 October 2009); doi: 10.1117/12.843252
Show Author Affiliations
Xitao Zheng, Northwestern Polytechnical Univ. (China)
Linhu Gou, Northwestern Polytechnical Univ. (China)
Xiaoxia Zheng, Northwestern Polytechnical Univ. (China)
Jianfeng Zhang, Northwestern Polytechnical Univ. (China)

Published in SPIE Proceedings Vol. 7493:
Second International Conference on Smart Materials and Nanotechnology in Engineering
Jinsong Leng; Anand K. Asundi; Wolfgang Ecke, Editor(s)

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