高压聚乙烯反应管声发射检测与评定

Acoustic inspection and integrity assessment for ultrahigh pressure polyethylene reaction tube

采用时差定位法确定声源的位置 ,进而检测了反应管内的活性缺陷情况。针对反应管在内压作用下 ,管壁出现屈服时会产生大量低幅值连续信号的现象 ,利用区域定位法确定声源的区域 ,通过对两个通道的区域定位信号进行统计分析 ,得到声发射事件 -压力曲线 ,并由该曲线确定了反应管的屈服内压。据实测结果对反应管的安全状况进行了评定。

The mobile defects are detected by the approach of tim e difference location,and the autofrettaged residual stress of inner surface of the reactor is measured by regional location approach.The principle of residual stress measurement by acoustic inspection technique is as follows:As the inner surface of the reactor begins to yield,there may be a greatdeal of low amplitude continuity signals emerged.Determ ining the location of sound source by regional location approach,and statistically analyzing the regional events of two channels,∑ event- p curve is obtained.Since the yielding pressure of the reactor corresponding to the point at which∑ event- p curve begins to rise abruptly,the yielding pressure may be determined by this curve.Substituting the yield pressure into the relationship between yielding pressure and residual stress,the residual stresses are then obtained.Basing upon the m easured residual stresses and the results of mobile defects,the safety and integrity of the reactor are analyzed and assessed.