摘要
根据Lamb波波动特性的Rayleigh-Lamb方程,推导出了316LMod不锈钢薄板相速度和群速度的频散曲线,为导波模式的识别和参数的选择奠定了基础。并通过对人工缺陷导波模式进行二维傅立叶变换,提取出背侧裂纹缺陷的主要Lamb模式,进而确定了8 mm厚316LMod不锈钢背侧裂纹的导波检测参数。最后通过含人工缺陷试块,绘制出了8 mm厚316LMod不锈钢背侧裂纹缺陷当量评定图,从而实现了对背侧裂纹缺陷的Lamb检测的定量评价。并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 to echo signal of the sample included artificial defects,then the lamb wave testing parametrs of 8 mm 316LMod stainless steel were confimed.Through the defet recognition to the sample,the defect equivalent evaluation was given,then the quantitative lamb wave testing to backside defects was realized.Finally,the method was verified by examples of urea reactors testing.
出处
《压力容器》
北大核心
2010年第3期52-55,63,共5页
Pressure Vessel Technology
基金
山东省质量技术监督局(2008KY-22Z)
