Measurement and calculation of interlaminar shear strength of heterogeneous multilayer plates

doi:10.19936/j.cnki.2096-8000.20231128.001

Abstract

Abstract: For the existed testing methods of composite interlaminar shear strength(ILSS), the formula used to calculate ILSS only contains the geometric parameters of the sample without considering the changes in modulus and neutral plane, so they are only applicable to isotropic or transversely isotropic composite plates. For the heterogeneous multilayer plates, these methods will bring different degrees of error results. In view of this, a new calculation method for neutral plane position and interlaminar shear stress of three-layer heterogeneous composite plates was firstly constructed in this paper, and then the general formula for calculating neutral plane and interlaminar shear stress of n-layer composite plates was derived. Combined with the short beam shear method, the measurement and calculation method of ILSS of heterogeneous multi-layer composite plates was proposed. The analysis show that the maximum relative interlaminar shear stress of the heterogeneous composite plate will change with the change of the modulus of each layer, and the neutral plane is no longer located in the geometric center of the sample. Short beam shear tests were carried out for two types of heterogeneous composite plates composed of GFRPP/glue/GFRPP and GFRPP/glue/steel respectively. The results indicate that the proposed method can accurately measure and calculate the ILSS of heterogeneous composite plates,while the results obtained by the existed methods gradually deviate from the true value with the increase of the anisotropy degree of composite plates.

Key words: interlaminar shear strength, interlaminar shear stress, neutral surface, short beam shear method, laminated plate, composites

CLC Number:

TB332

ZHOU Jun, WANG Yang, HUANG Ming, ZHAI Menglei, CHEN Wenguang, ZHANG Na, LIU Chuntai. Measurement and calculation of interlaminar shear strength of heterogeneous multilayer plates[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(11): 5-11.

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