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A study of failure in carbon/foam sandwich composites with stress concentration

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Author
Sistare, Peter J.
Date
1995-09
Advisor
Kwon, Young W.
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Abstract
Both experimental and numerical studies were performed to understand the failure mechanism of carbon/foam sandwich composite plates with stress concentration. The plates had circular holes and were subjected to bending and compressive loading. Both three-point and four-point bending tests were conducted, For the testing, the foam thickness, the size of the hole, the number of holes, and the hole location were varied. In addition, a finite element analysis was conducted to verify and understand the experimental results. It was found that four-point bending is not an effective test method to evaluate the effects of stress concentration at a hole. Compressive loading is an effective method. A sample without a hole fails at the quarter point due to foam core shear failure. With a hole at the center, the core shear stress at the quarter point increases with increasing hole size. However, the skin bending stress at the hole increases at a faster rate. When the hole size reaches a critical diameter, the failure mode changes to skin bending failure at the hole. (MM)
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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http://hdl.handle.net/10945/35196
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  • 1. Thesis and Dissertation Collection, all items

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