碳纤维复合材料与高强度钢板螺栓连接拉伸性能

Tensile Properties of Bolted Joints Between CFRP and High Strength Steel Plate

以单螺栓单剪连接[0°/90°]4s环氧树脂基碳纤维增强复合材料(CFRP)/高强度钢板(DP980)为研究对象,对接头宽度和端距进行了匹配设计,用试验和仿真手段,分析连接结构在承受拉伸载荷作用时的失效过程和破坏模式.结果表明:接头宽度和端距对接头破坏模式影响很大,接头宽度对接头刚度影响较大,端距对接头刚度影响较小,一定范围内接头宽度和端距对接头强度影响均较大;接头宽度与螺栓孔径的比值≥6、端距与螺栓孔径的比值≥3时,接头强度趋于最大值,并且破坏模式以挤压破坏为主;二次弯曲对CFRP/DP980接头强度影响很大.

An experimental study on the effect of width（W）and edge distance（E）on single-lap,single-bolt,[0°/90°]4 s epoxy carbon fiber reinforced plastics（CFRP）with highstrength steel DP980 joints is presented in this paper.Failure processes and failure modes of the CFRP/DP980 joints bearing tensile loads are studied.It is found that the failure modes largely depend on the width and the edge distance of laminates.The width of laminate has a great influence on the stiffness of joint,while the edge distance has little.Within a certain range,both the width and the edge distance have a great influence on the joint strength.When the ratio of width to hole diameter is larger than or equal to six and the ratio of edge distance to hole diameter is larger than or equal to three,the strength of joint tends to a maximum value;meanwhile the failure modes are mainly bearing failure. CFRP laminates are sensitive to secondary bending.