铺放参数对复合材料厚度方向力学行为影响

doi:10.7527/S1000-6893.2020.23821

Abstract

Abstract: To explore the effect of the change in laying process parameters on the mechanical behavior of composite materials in thickness direction, the influence of laying pressure and laying temperature on the tensile strength and modulus was measured through an out-of-plane tensile experiment, and the failure mode of the specimen was analyzed. The test results showed that the increased laying pressure would decrease the thickness of the interlayer resin rich area while increasing the out-of-plane tensile strength of the composite materials. The maximum strength of test groups was obtained at laying pressure of 0.225 MPa, and the strength increased by 13.1% compared with that at 0.075 MPa. The failure mode changed from the combination of fiber fracture and layer peeling to fiber fracture. Further increase of laying pressure would squeeze the interlayer resin, and change the form of the resin rich area, thereby causing the tensile strength decrease and reemergence of peeling failure. The suitable laying temperature of the composite material used in the experiment was 30 ℃. Excessive laying temperature will lead to porosity increase, causing serious decrease in the out-of-plane tensile strength and resulting in irregular crack propagation. Compared with the laying temperature of 25 ℃, when it was 45 ℃, the out-of-plane tensile strength of the composite material decreased by 19.2%, and the failure mode was transformed from the combined failure of fiber fracture and layer peeling to dominant layer peeling.

Key words: automated placement, composite, processing parameters, out-of-plane tensile, thickness direction

CLC Number:

V258⁺.3

CAI Licheng, QIAN Shimeng, WANG Haijin, DING Huiming, XU Qiang. Effect of laying parameters on mechanical behavior of composite in thickness direction[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(2): 423821-423821.

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Effect of laying parameters on mechanical behavior of composite in thickness direction

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