BENDING FATIGUE BEHAVIOR OF 3D BRAIDED COMPOSITE T-BEAM

Abstract

Abstract: This paper reports the three-point bending fatigue behaviors of four-step 3D braided composite T-beam manufactured by four-step braiding technology and vacuum assisted resin transfer molding (VARTM). The fatigue failure of the braided composite T-beam under different stress levels have been represented to explain the fatigue behaviors.The quasi-static three-point bending tests were conducted on the MTS 810.23 material tester system, and the fatigue tests with the sinusoidal wave loading of frequency of 3 Hz and stress ratio (R) value of 0.1 were implemented on the same system. The S-N curve, stress-displacement curves and the max and min deflections curves based on experimental data were used for analysis, and the load cysles of three-point fatigue test under stress level of 50% was found tobe over 5×10⁵ times. The fiber breakage on the web is the main damage mode which leads the ultimate failure of the 3D braided composite T-beam according to the damage morphologies.

Key words: 3D braided, T-beam, bending fatigue, damage mode

CLC Number:

TB332

ZHANG Zhong-wei, YAN Jing. BENDING FATIGUE BEHAVIOR OF 3D BRAIDED COMPOSITE T-BEAM[J]. COMPOSITES SCIENCE AND ENGINEERING, 2014, 0(4): 42-45.

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