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中文摘要：
针对常规的无损检测方法不能够动态跟踪钢绞线的损伤演化过程,提出了采用声发射技术来监测钢绞线的损伤演化。利用钢绞线的拉伸试验,对其损伤全过程进行了声发射监测,得到了钢绞线拉伸损伤全过程的声发射特征信号：钢绞线在断裂之前,声发射特征参数并不明显,在接近断裂时,声发射信号迅速增大,并在屈服点附近出现一个大的突发信号。通过声发射机理分析,发现声发射累积能量可作为钢绞线损伤的特征参量,能动态分析钢绞线损伤演化过程和规律,较容易判断断丝的根数和发生的时刻。利用声发射累积能量的相对变化来定义钢绞线损伤因子,推导了用声发射特征参数表示钢绞线损伤演化方程,此方程可用威布尔累积分布函数来描述,并对其正确性与合理性给予了验证与分析。
英文摘要：
Conventional non-destructive methods can＇t dynamieally monitor the steel strands damage evolution process, so acoustic emission technique is proposed to monitor the damage. Experiments on acoustic emission characteristics of full-regime steel strands tensile failure are carried out. Acoustic emission characteristic parameters of steel strand damage are obtained. The testing results show that the acoustic emission characteristic parameter isn＇t apparent before fracture, the acoustic emission signal increases rapidly when approaching critical fracture point and appears a big burst signal nearby yield point. According to the correlation figure of acoustic emission accumulative energy, damage characteristic parameter of steel strand can be expressed through acoustic emission accumulative energy, the damage evolution process and law can be dynamically analyzed and broken strand numbers and time are very easily judged. Based on the monitoring data,the relationship between acoustic emission parameter and damage variables is derived.The steel strand tensile damage evolution equation is defined with acoustic emission accumulative energy relative change, the equation can be expressed using Weibull Cumulative distribution function, its rightness and rationality are verified through experiments.
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