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DIGITAL LIBRARY: CAMX 2023 | ATLANTA, GA | OCTOBER 30-NOVEMBER 2

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A methodology to conduct Push-Out tests to evaluate the degradation in interfacial shear strength of Carbon fiber/ Vinyl Ester composites due to long-term exposure to seawater.

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Title: A methodology to conduct Push-Out tests to evaluate the degradation in interfacial shear strength of Carbon fiber/ Vinyl Ester composites due to long-term exposure to seawater.

Authors: V. Chawla, S. Puplampu, D. Penumadu

DOI: 10.33599/nasampe/c.23.0167

Abstract: In this study, single fiber (~7-micron diameter) push-out tests are conducted to evaluate hygrothermal effects on the interfacial shear strength (IFSS) of carbon fiber/vinyl ester (CF/VE) composites. Saturated samples are prepared by soaking the coupons in simulated seawater at 40°C for two years. A thorough investigation is carried out on the push-out test results' preparation, validity, and interpretation. Firstly, a polishing methodology is presented that consistently yields thin films of CF/VE composites in the thickness range of 15 to 120 microns. The results show a 41.2 percent drop in IFSS due to long-term hygrothermal exposure. Using scanning electron microscopy (SEM), the authors show that during the push-out tests, the failure initiates locally at the zone of minimum bond strength at the bottom (away from the indenter), then propagates along the length of the interface. Through a series of tests conducted at different interface thicknesses, the authors validate that the influence of radial tensile stresses originating due to bending is negligible. Using the SEM imaging of the pushed-out fibers, the authors show that the interfacial failure, not the matrix shear failure, is the primary source of deformation in push-out deformation. Furthermore, the results are shown to be dependent upon the interfacial volume indicating failure characteristics of Weibull weakest link theory.

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Conference: CAMX 2023

Publication Date: 2023/10/30

SKU: TP23-0000000167

Pages: 15

Price: $30.00

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