摘要
根据Rayleigh-Lamb方程,推导出尿素合成塔内衬316LMod不锈钢薄板相速度和群速度的频散曲线。通过对包含人工缺陷的试块回波信号进行二维傅里叶变换,提取出了背侧裂纹缺陷的主要Lamb波模式,进而确定了Lamb波检测参数。通过对试块的缺陷识别,绘制出了缺陷当量评定图,实现了对背侧裂纹缺陷的Lamb检测的定量评定。最后通过尿素合成塔检测实例验证了该方法的有效性。
According to Rayleigh-Lamb equation,the dispersion curves of phase and group velocities of 316LMod stainless steel linings were derived out.The main Lamb wave mode of backside defect was drawn out through 2D FFT of echo signal of the sample with artificial defects,then,the Lamb wave testing parameters were confirmed.Through the defect recognition of the sample,the defect equivalent evaluation was given,and then,the quantitative Lamb wave testing of backside defects was realized.Finally,the method was verified by examples of urea reactors testing.
出处
《无损检测》
2010年第5期370-372,共3页
Nondestructive Testing
基金
国家质检总局耐腐蚀高压容器衬里层快速检测技术研究(2008QK178)
关键词
Lamb波检测
不锈钢
频散曲线
背侧缺陷
Lamb wave testing
Stainless steel
Dispersion curves
Backside defect
