Prediction method for ultimate strength of fiber-reinforced resin matrix composite structures

doi:10.19936/j.cnki.2096-8000.20250628.005

Abstract

Abstract: A convenient and practical method for predicting the ultimate strength of structures was developed for accelerating the progress of structural design scheme demonstration in the early stage of projects. Firstly, an analytical expression for the equivalent modulus of laminate was derived based on the laminate theory. Secondly, according to the assumption that the failure occurred layer by layer and stiffness degradation, the first layer failure strength and ultimate strength of laminate are obtained by numerical algorithm. Then, by comparing the predicted values and the tested values of equivalent mechanical parameters of laminate, it was found that the predicted values of equivalent modulus are completely consistent with the tested values, the predicted values of ultimate tensile strength are also completely consistent with the tested values, only the predicted values of ultimate compressive strength were 10% lower than the tested values. Finally, the ultimate strength of typical end frame flange structures was predicted by the traditional structural finite element method, based on equivalent mechanical properties of laminate. Through comparison with test, it was found that the predicted ultimate load was 15% lower than the experimental failure load. The method has a fast calculation speed and enough precision for structural design scheme demonstration in the early stage of projects.

Key words: fiber reinforced resin matrix composite, laminate, equivalent modulus, equivalent strength, ultimate strength, maximum stress criterion

CLC Number:

TB332

CHENG Xianhe, CHENG Hongchuan, ZOU Zhiwei, LIU Jiaxin, LI Yulong, LIN Zaiwen. Prediction method for ultimate strength of fiber-reinforced resin matrix composite structures[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(6): 34-40.

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