摘要
以CFRP和GFRP 2种复合材料为例,研究正交复合材料在冲击载荷作用下的拉伸力学性能。首先,介绍了Hopk inson杆冲击拉伸实验设备以及实验技术,对实验中涉及的试件连接技术问题进行了分析讨论,并提出了相应对策。推导了应力、应变的计算公式。对CFRP、GFRP层合板进行了冲击拉伸实验研究,得到不同加载率下2种层板的应力-应变(σ-ε)曲线,以及断裂强度、拉伸模量、断裂应变随加载速率的变化规律,以期对复合材料层板在冲击拉伸情况下动态力学行为和变形、破坏机理获得初步认识。
Purpose. Experiments for determining impact tensile properties of orthogonally anisotropic composite laminates must be carefully planned. In the full paper we explain in detail what careful considerations we took in planning the experiments. In this abstract we just sketch two of these considerations： （1） the method of joining tensile specimen; the usual method of screw joining brings problems that adversely affect the collection and processing of test data; Fig. 2 in the full paper helps the reader understand our method of joining that obviates the necessity of screw joining; （2） the validity of the one dimensional stress wave theory; in other words, can it approximately describe the propagation of stress wave for our problem？ We conducted Hopkinson bar-bar impact tensile tests to determine dynamic mechanical parameters of CFRP and GFRP laminates under different strain rates （550/s-1 600/s）. We derived the calculating formulas of the stress and strain of the laminates based on one dimensional stress wave theory, then measured the stress-strain curves of the two laminates under different strain rates and determined the mechanical parameters such as failure strength （Fig. 3 and Fig. 4 in the full paper）, Young＇s modulus （Fig. 5） and fracture strain （Fig. 6）. The experimental results show that the mechanical properties of CFRP and GFRP laminates are clearly dependent upon loading rate. Both failure strength and fracture strain increase with increasing loading rate. Young＇s moduli of the two laminates decrease with increasing loading rate.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2006年第3期330-333,共4页
Journal of Northwestern Polytechnical University
基金
航空科学基金(00B53009)资助
