Fundamental study to establish the principle of acoustoelastic residual stress measurements using off-axis waves

建立离轴波声弹性残余应力测量原理的基础研究

• 批准号: 11450049
• 负责人: IWASHIMIZU Yukio
• 金额: $ 3.01万
• 依托单位: Ritsumeikan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450049/
• 关键词: Ultrasonic Wave; Acoustoelasticity; Oblique Incidence; Longitudinal Off-axis Wave; Texture Anisotropy; Polycrystalline Model; Velocity Anisotropy; Propagation Time; 異方性; 伝播時間; 音速; 応力

In most of acoustoelastic measurements so far made, the propagation direction of waves has been taken normal or parallel to specimen surfaces, and the acoustoelastic use of off-axis waves propagating obliquely against it has been hardly investigated except in few works. Tins study is concerned with the formulation of the acoustoelastic law for off-axis waves.Theoretically, the dependence of the off-axis wave velocity on the propagation direction(θ, φ) is analyzed by the perturbation method (general approximation), and , assuming the texture anisotropy simplified based on the polycrystalline model, the result is arranged in expanded expressions (polycrystalline approximation).In the experiment, a steel plate is taken as the specimen, and steel wedges are mainly used for transmitting and receiving off-axis waves. The propagation direction is changed by replacing wedges (wedge angle θ = 20° , 30°, 40°, 50°), and rotating the transducer direction (φ = 15° 〜 195° ), and the propagation time T(θ, φ) of off-axis reflected waves is measured in each propagation direction. From these experimental results, it is confirmed that the velocity anisotropy of longitudinal off-axis waves is explained relatively well by the general approximation. However, it is also shown difficult to explain the same velocity anisotropy quantitatively by the polycrystalline approximation.

在迄今为止的大多数声弹性测量中，波的传播方向都是垂直于或平行于试样表面，除了少数作品外，几乎没有研究过斜向传播的离轴波的声弹性利用。他的研究是关于离轴波的声弹性规律的公式。理论上，采用摄动法（一般近似）分析了离轴波速对传播方向（θ, φ）的依赖关系，并在多晶模型的基础上简化了织构各向异性，将结果安排为展开表达式（多晶近似）。实验中以钢板为试样，钢楔主要用于发射和接收离轴波。通过更换楔形片（楔形角θ = 20°、30°、40°、50°）和旋转换能器方向（φ = 15°~ 195°）改变传播方向，测量离轴反射波在各个传播方向上的传播时间T（θ, φ）。这些实验结果证实，用一般近似可以较好地解释纵离轴波的速度各向异性。然而，用多晶近似来定量解释相同的速度各向异性也显示出困难。

项目成果

Y. Iwashimizu: "Effects of texture anisotropy and stress on the propagation of off-axis ultrasonic waves (in Japanese)"Prerprint of JSME. No. 004-1. 1-35-1-36 (2000)

Y. Iwashimizu：“纹理各向异性和应力对离轴超声波传播的影响（日语）”JSME 预印本。

Y. Iwashimizu and Y. Ikeda: "Measurements of texture anisotropy by using off-axis ultrasonic waves (in Japanese)"Preprint of the Symposium on Acoustoelastic Applied Measurement JSNDI. No. 4. 56-59 (2000)

Y. Iwashimizu 和 Y. Ikeda：“使用离轴超声波测量纹理各向异性（日语）”声弹性应用测量研讨会 JSNDI 的预印本。

岩清水幸夫, 池田陽至: "斜角入射超音波による組織異方性の測定"日本非破壊検査協会音弾性応用測定研究会講演論文集. No.4. 56-59 (2000)

Yukio Iwashimizu、Hiroshi Ikeda：“使用斜入射超声波测量组织各向异性”日本无损检测协会非弹性应用测量研究组论文集第 4. 56-59 号（2000 年）。

岩清水幸夫: "斜角入射超音波の伝播に対する異方性と応力の効果"日本機械学会講演論文集. No.004-1. 1-35-1-36 (2000)

Yukio Iwashimizu：“各向异性和应力对倾斜入射超声波传播的影响”日本机械工程师学会会议记录第 004-1-36 号（2000 年）。