替代TOFD技术的适用性和应用
Shijie Jin1, Zhicheng Wang1, Xinhao Wang1
1NDT&E Laboratory, Dalian University of Technology, Dalian 116085, China.
Ultrasonics
|December 31, 2024
概括
另一种超声波飞行时间衍射 (TOFD) 技术通过使用间接衍射波有效检测近表面缺陷. 一个新的理论模型优化了技术选择,高精度地减少了合金板的死区.
科学领域:
- 材料科学 材料科学 材料科学
- 非破坏性测试 不破坏性测试
- 超声波测试 超声波测试 超声波测试
背景情况:
- 标准的超声波飞行时间衍射 (TOFD) 技术在检查近表面缺陷方面存在局限性,原因是它的死区.
- 替代TOFD方法利用间接衍射波来克服死区限制,但它们的适用性取决于各种参数.
- 了解样本厚度,缺陷深度,检查频率和探测器中心距离 (PCS) 等参数的影响对于有效的近表面缺陷检测至关重要.
研究的目的:
- 分析和比较替代TOFD技术的适用性,用于检测合金板的近表面缺陷.
- 根据参数条件,开发一个理论模型来选择最佳的替代TOFD技术.
- 通过实验验证拟议的理论模型在减少死区和准确测量缺陷深度方面的有效性.
主要方法:
- 使用合金板的替代TOFD技术的比较分析.
- 基于结构波和间接波的时间差的评价指数的定义.
- 对于模式转换波 (LS-L,LL-S) 的三维适用性图的理论计算和构成.
- 为最佳的替代TOFD技术选择建立一个理论模型.
- 在合金板 (厚度为7-20毫米) 中对深度为2.0-3.0毫米的缺陷进行实验验证.
主要成果:
- 开发的理论模型准确地确定了最适合的替代TOFD技术,用于浅地下缺陷检测.
- 实验结果表明,有效地减少了死区范围.
- 缺陷深度的测量误差在3.6%以内,证实了该模型的高精度.
结论:
- 提出的理论模型提供了一个强大的框架,用于选择最佳的替代TOFD技术,用于近表面缺陷检查.
- 该方法有效地提高了TOFD的适用范围,用于检测合金中的浅缺陷.
- 这些发现有可能在各种材料和结构的TOFD检查中得到更广泛的应用.
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