19 May 2005 Effects of pre-stresses on impact-induced damage of CFRP laminates
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The objective of this study is to experimentally evaluate the effects of the impact-induced damages of Carbon Fiber Reinforced Plastic (CFRP) laminated composites under no stress and pre-stress conditions such as (1) no loading, (2) compressive loading, and (3) tensile loading. The symmetrical 4-points bending apparatus was designed and manufactured for making the pre-stressed conditions. Four kinds of test specimens having laminate configurations of (012/θ20/012) were employed, wherein their ply angles (denoted as "θ") were 30°, 45°, 60°, and 90°. The test specimens were impacted with an air-gun type of impact apparatus. First, a strain change caused by the impact was measured. Second, a mechanical scanning acoustic reflection microscope (SAM: pulse-wave mode) was used to detect an interior damage (e.g., delamination) of the impact-induced specimens.
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Chiaki Miyasaka, Chiaki Miyasaka, Hideaki Kasano, Hideaki Kasano, Peter J. Shull, Peter J. Shull, } "Effects of pre-stresses on impact-induced damage of CFRP laminates", Proc. SPIE 5767, Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure IV, (19 May 2005); doi: 10.1117/12.601771; https://doi.org/10.1117/12.601771

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