Acoustic Emission Characteristics of Damage of Carbon /Epoxy Composite on Different Tensile Conditions
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摘要: 为了研究复合材料在动载荷和恒载情况下的损伤机理，在不同加载速度和恒载情况下，对T700/环氧复合材料进行了拉伸损伤声发射试验研究。从其损伤过程和声发射特性发现，在较低速率下，该复合材料断裂强度对拉伸速率变化不够敏感；但随着拉伸速率的增大，基体及界面损伤的高峰出现时间逐渐提前，断裂时损伤越来越不完全；恒载声发射效应反映了复合材料抗蠕变损伤的能力，而其收敛能力的大小反映了复合材料构件历史损伤的严重程度。Abstract: In order to research on the damage mechanism of carbon/epoxy composite under the conditions of dynamic load and constant load, the experiments of the tensile damage of carbon/epoxy unidirectional composite sample on the conditions of different loading speed and constant load are done in this paper. From the damage process and AE characteristics, it is found that in the lower rate, the rupture intensity of this composite is less sensitive with the changing of tensile rate, but as the stretching rate gradually advances, the peak of matrix and interface damage appear in advance and the fracture damage gets more and more incomplete. The AE effect under constant load reflects the ability of resistance to creep, and the size of its convergence ability reflects the historical injury severity of this composite.
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Keywords:
- Acoustic emission testing /
- Tensile /
- Dynamic load /
- Constant load
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