DEVELOPMENT OF TENSOR FIELD CT-METHOD FOR HYBRID TECHNIQUE IN STRESS AND STRAIN ANALYSES

应力和应变分析中张量场 CT 混合技术的开发

• 批准号: 10450051
• 负责人: TAKASHI Masahisa
• 金额: $ 2.3万
• 依托单位: AOYAMA GAKUIN UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10450051/
• 关键词: ellipsometry; Jone's calculus; tensor field computer tomography; elliptically polarized light; scattered photoelasticity; white light photoelasticity

The main purposes of this study are how to overcome difficulties in accurate and precise measurement of three parameters in the polarimetry technique eliminating the rotation of polarization axis along the path of incident light, and to establish a useful method for 2D and 3D photoelastic stress and strain analysis not only in symmetrical but in unsymmetrical stress fields. The results are summarized as follows ;(1) Jone's Matrix Fourier Image Polarimetry Technique : Till the end of last fiscal year, the hardware system for the polarimetry technique has been established utilizing the grant-in-aid in 1998. Then, the technique for 2D fields is successfully applied to the accurate measurement and determination of retardation, azimuth and ellipticity angles both in thin and thick disks under diametrical compression. In order to determine the secondary principal stress field in a 3D sphere model, double beam incident technique is now developed. Although some further improvements are needed, … More the fundamental algorithms and techniques are completed.(2) Scattered Light Photoelasticity Technique with Tricolor Laser : Another approach to 3D analysis with high expectation is the improvement of the scattered light technique using a tricolor laser for light source sloughing off the current technique with a monochromatic light. In this study, secondary principal stress difference and azimuth angle in a sphere under diametrical compression is successfully analyzed not only in symmetrical but unsymmetrical planes of stress distribution. Further improvement in accuracy of azimuth measurement is still exist, but the technique is proven to be very useful.(3) Photoelastic and Photoviscoelastic Techniques with Elliptically Polarized White Light : In the current photo (visco) elastic technique, more than two different optical information have to be obtained. The fact means that it has been impossible to trace the time variation of stress field, particularly in cases of crack tip and/or contact regions under moving condition. The technique proposed enables simultaneous measurement both of isochromatics and isoclinics with a single exposure, using elliptically polarized white light. Several applications of the technique to the evaluation of crack tip stress field is successfully demonstrated. Less

本研究的主要目的是如何克服偏振测量技术中三个参数精确测量的困难，消除偏振轴沿入射光路径的旋转，并建立一种不仅在对称应力场中而且在非对称应力场中进行2D和3D光弹性应力和应变分析的有用方法。主要研究成果如下：(1)琼斯矩阵傅里叶图像偏振测量技术：截至上财年末，利用1998年的资助资金，已经建立了偏振测量技术的硬件系统，并成功地将二维场技术应用于薄盘和厚盘中延迟角、方位角和椭圆度角的精确测量和确定。 径向压缩。为了确定 3D 球体模型中的次主应力场，现在开发了双光束入射技术。虽然还需要一些进一步的改进，但基本的算法和技术已经完成。 (2) 三色激光散射光光弹性技术：另一种寄予厚望的 3D 分析方法是改进使用三色激光作为光源的散射光技术，摆脱当前使用单色光的技术。在这项研究中，不仅在应力分布的对称平面上而且在非对称平面上成功地分析了径向压缩下球体中的次主应力差和方位角。方位角测量精度仍有待进一步提高，但该技术已被证明非常有用。（3）椭圆偏振白光光弹性和光粘弹性技术：在当前的光（粘）弹性技术中，必须获得两种以上不同的光学信息。这一事实意味着追踪应力场随时间的变化是不可能的，特别是在裂纹尖端和/或接触区域在移动条件下的情况。所提出的技术能够使用椭圆偏振白光通过单次曝光同时测量等色和等斜。成功论证了该技术在裂纹尖端应力场评估中的几种应用。较少的

项目成果

Yoneyama,S.,Gotoh,J.and Takashi,M.: "Experimental Analysis of Rolling Contact Stresses in a Viscoelastic Strip"Experimental Mechanics. 40-2. 203-210 (2000)

Yoneyama,S.、Gotoh,J. 和 Takashi,M.：“粘弹性条中滚动接触应力的实验分析”实验力学。

Takashi, M.and Mawatari, S.: "Construction of Approximate Analytical Function from Photoelastic Data"Proc.of Int.Conf.on Advanced Technology Experimental Mechanics'99, Ube. 264-269 (1999)

Takashi, M. 和 Mawatari, S.：“根据光弹性数据构建近似分析函数”Proc.of Int.Conf.on Advanced Technology Experimental Mechanics99，宇部。

Yoneyama,S.and Takashi,M.: "Photoelastic Analysis with a Single Tricolor Image"Optics and Lasers in Engineering. 29-6. 423-435 (1998)

Yoneyama,S. 和 Takashi,M.：“单三色图像的光弹性分析”光学和激光工程。

Shimizu, M., Yoneyama, S.and Takashi: "Noise Reduction and Accuracy Improvement in Tricolor Photoelastic Technique"Proc.Of SEM Spring Conf.On Experimental Mechanics Houston. 132-135 (1998)

Shimizu, M.、Yoneyama, S.和 Takashi：“三色光弹技术中的降噪和精度改进”Proc.Of SEM Spring Conf.On Experimental Mechanics Houston。

Yoneyama, S., Sakurai, T., Ogawa, K.and Takashi, M.: "Photoviscoelastic Technique with Elliptically Polarized White Light and Its Application to Crack Growth in a Viscoelastic Strip"J.of Material Testing Research Association of Japan. Vol.45, No.1. 42-49

Yoneyama, S.、Sakurai, T.、Okawa, K. 和 Takashi, M.：“椭圆偏振白光光粘弹性技术及其在粘弹性条裂纹扩展中的应用”日本材料测试研究协会杂志。