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Effect of autoclave pressure on interfacial properties at micro- and macro- level in polymer-matrix composite laminates

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Abstract

Variable autoclave pressures were applied on polymer-matrix composite to evaluate the effects on interfacial shear strength (IFSS) and interlaminar shear strength (ILSS) in [0]10 T800/X850 composite laminates. The characterizations of microstructure of the laminates were obtained using optical digital microscope and scanning electron microscope. The IFSS and ILSS were measured by fiber push-in and short beam three-point bending tests respectively. Results have shown that there exists an optimum range of autoclave pressure. The delamination and voids are mainly located at the plies of laminates, where the shapes of voids are changeable. The number and size of voids decrease as the pressure increases, while the impregnation of resin on fibers is improved continuously, leading to an increase for the fiber volume fraction. The IFSS and the ILSS are related with the pressure all in the polynomial increasing models. For void contents are above 1 %, the ILSS increases progressively as the pressure increases. Conversely, when void contents are less than 1 %, the changes of ILSS are negligible and the ILSS is insensitive to the voids. For T800/X850 composite, the autoclave pressure in the range of 0.4 MPa to 0.6 MPa is recommended.

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Correspondence to Lihua Zhan or Wei Tan.

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Chang, T., Zhan, L., Tan, W. et al. Effect of autoclave pressure on interfacial properties at micro- and macro- level in polymer-matrix composite laminates. Fibers Polym 18, 1614–1622 (2017). https://doi.org/10.1007/s12221-017-7384-4

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  • DOI: https://doi.org/10.1007/s12221-017-7384-4

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