STUDY ON THE PREPARATION AND TENSILE PROPERTIES OF DP590 HIGH STRENGTH STEEL/CARBON FIBER COMPOSITE LAMINATES

Abstract

Abstract: The DP590 high strength steel/carbon fiber composite laminates was successfully prepared by press molding process, and its microstructure and tensile properties were tested. The influence of the surface roughness of steel plate on the tensile strength of laminates was studied. The formula for predicting the tensile strength of laminates was proposed based on the tensile properties of DP590 and MVF theory. The results show that the composite laminates are compact with 0° carbon fiber layer, 90° carbon fiber layer, resin matrix and metal matrix. The metal matrix and the carbon fiber layer are filled by resin, which plays a good role in bonding. The microstructure has very little molding defects. Compared with DP590 high-strength steel, the density of the prepared laminate is reduced by 24%, which has obvious weight reduction effect. It shows that the compression molding process is suitable for the preparation of high-strength steel/carbon fiber composite laminates, and this type of material has a large potential for light weighting. Shot peening to improve the surface roughness of steel plate can improve the strength of laminated plate to a certain extent, with a maximum increase of 68 MPa, but the relationship between the roughness of steel plate and the average tensile strength of laminated plate is obviously nonlinear. Based on the MVF theory, the strength of composite laminates are predicted by tensile strength, yield strength and stress value of high strength steel when laminates break. The results show that the highest prediction errors are 38.5%, 12.8% and 8.1%, respectively. It shows that the application of MVF theory in the prediction of metal fiber laminate structure with high plasticity should fully consider the high plasticity of metal for the influence of prediction error. By using the corresponding high-strength steel stress value when the composite laminate is broken and substituting it into the MVF theoretical formula, better prediction accuracy of tensile strength can be obtained.

Key words: compression molding, high strength steel, composite laminates, tensile strength, prediction

CLC Number:

TB332

HU Hai-chao, XU Shi-xin, WU Jin, DENG Su-huai, WANG Zhan-hui, BI Yan. STUDY ON THE PREPARATION AND TENSILE PROPERTIES OF DP590 HIGH STRENGTH STEEL/CARBON FIBER COMPOSITE LAMINATES[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(1): 78-84.

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