尿素合成塔内衬316LMod不锈钢薄板背侧缺陷的Lamb波检测

基金项目:

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)

详细信息

Lamb Wave Testing Technique of Backside Defects in 316LMod Stainless Steel Linings of Urea Reactors

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。
- Lamb波检测 /
- 不锈钢 /
- 频散曲线 /
- 背侧缺陷
Abstract: 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.
- Lamb wave testing /
- Stainless steel /
- Dispersion curves /
- Backside defect

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