location: Current position: Home >> Scientific Research >> Paper Publications

基于几何方法的焊缝倾斜裂纹TOFD定量检测

Hits:

Indexed by:期刊论文

Date of Publication:2016-04-10

Journal:无损检测

Included Journals:ISTIC

Volume:38

Issue:4

Page Number:1-5,48

ISSN No.:1000-6656

Key Words:超声衍射时差法;几何方法;倾斜裂纹;CIVA软件仿真

Abstract:针对合金钢对接焊缝中倾斜裂纹定量困难的问题,提出了TOFD(超声衍射时差法)定量检测倾斜裂纹的方法.基于焊缝纵断面方向上两次B扫查间隔、两次B扫查过程中声程最短时编码器移动距离差和倾斜裂纹三者所构成的三角形,利用三者之间几何关系实现裂纹倾斜角度与长度定量.模拟结果表明:对长度5,10,60 mm,倾斜角度范围为10°~90°的裂纹进行定量验证,角度定量误差小于1°;长度定量相对误差小于5%.试验针对对接焊缝试块中长度60 mm,倾斜角度范围为30°~60°的倾斜裂纹应用此方法进行定量验证,可得裂纹角度定量误差最大值为0.29°;长度定量误差最大值为0.94 mm.

Pre One:厚壁粗晶铸造奥氏体不锈钢相位相干成像模拟

Next One:The quantitative study of TOFD influenced by the frequency window of autoregressive spectral extrapolation