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本文用声发射技术动态监测玻璃纤维束拉伸时损伤的演化规律。声发射幅度的对数累积分布基本上为一直线,声发射事件数与纤维束位移值近似为一指数曲线。由声发射事件数与纤维断裂数的关系,可得到实际损伤演变规律。根据纤维束断裂规律建立统计损伤模型,导出的纤维束外载与位移的本构关系计算值与实验值相当吻合。表明统计损伤模型描述纤维束断裂损伤是合理的,声发射技术是一种监测材料内部损伤及其演变规律的有效手段。
In this paper, the acoustic emission technique was used to dynamically monitor the evolution of damage during the stretching of glass fiber bundles. Acoustic emission amplitude logarithmic cumulative distribution is basically a straight line, the number of acoustic emission and fiber bundle displacement is approximately an exponential curve. According to the relationship between the number of acoustic emission events and the number of fiber fractures, the evolution law of actual damage can be obtained. According to the rule of fiber bundle breakage, a statistical damage model is established. The calculated constitutive relation between fiber bundle load and displacement is in good agreement with the experimental data. It shows that the statistical damage model is reasonable to describe the fiber bundle fracture damage. Acoustic emission technique is an effective method to monitor the internal damage and its evolution.