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

基本信息

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

项目摘要

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，并建立一种有效的2D和3D光弹性应力和应变的方法不仅在对称应力场中而且在非对称应力场中都进行了分析，结果总结如下：（1）琼斯矩阵傅立叶图像偏振测量技术：截至上财年末，偏振测量的硬件系统。利用1998年的资助建立了该技术。随后，二维场技术成功应用于直径压缩下薄盘和厚盘的延迟、方位角和椭圆度角的精确测量和确定。为了确定 3D 球体模型中的次主应力场，目前已经开发出双光束入射技术，尽管还需要一些进一步的改进，但基本算法和技术已经完成。(2) 散射光。三色激光光弹性技术：另一种寄予厚望的 3D 分析方法是改进散射光技术，使用三色激光作为光源，取代了现有的单色光技术。在本研究中，二次主应力差和方位角。不仅在对称平面上而且在非对称平面上都成功地分析了径向压缩下的球体中的应力分布。方位角测量精度的进一步提高仍然存在，但该技术已被证明是可行的。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，这一事实意味着不可能追踪时间变化。所提出的技术能够使用椭圆偏振白光同时测量等色线和等斜线，特别是在移动条件下的裂纹尖端和/或接触区域。该技术在裂纹尖端应力场评估中的应用已成功论证。