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首页> 外文会议>SEM IX International Congress on Experimental Mechanics June 5-8, 2000 Orlando, Florida >A Study of Crack-tip Deformation Fields in PMMA under Mixed-mode Loading
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A Study of Crack-tip Deformation Fields in PMMA under Mixed-mode Loading

机译：混合模式载荷下PMMA裂纹尖端变形场的研究

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摘要

A stereo vision is applied to measure the full three-dimensional deformation field around the crack tip region of the compact tension shear (CTS) specimen made of PMMA subjected to mixed mode (I/II) loading. Through coordinate transformation, the measured displacement fields were converted to the radial and circumferential displacements, U_r and U_theta, relative to an erected specimen ccoordiante system. Using the experimentally determined displacement components, U_r and U_theta, and the corresponding analytically determined displacements with several higher order terms include,d the stress intensity factors (K_I and K_(II)) and the amount of rigid body translation and rotation of the specimen are calculated simultaneously through the least-squares method. Using the estimated rigid body translation and rotation, the effect of the rigid body motion on the in-jplane displacements, u and v, was eliminated. Since the PMMA is a linear elastic material, the J integral values are evaluated using the experimentally determined in-plane displacements along several contours surrounding the crack tip. It is noted that the J integral values are calculated based on the plane stress condition. Also the J integral values are obtained by K_i and K_(II).
机译：应用立体视觉来测量在混合模式（I / II）载荷下由PMMA制成的紧凑拉伸剪切（CTS）试样的裂纹尖端区域周围的整个三维变形场。通过坐标变换，将相对于竖立的标本古柯蒂安特系统，将测得的位移场转换为径向和圆周位移U_r和U_theta。使用实验确定的位移分量U_r和U_theta以及相应的分析确定的具有多个高阶项的位移，包括应力强度因子（K_I和K_（II）），以及刚体平移和旋转量为通过最小二乘法同时计算。使用估计的刚体平移和旋转，可以消除刚体运动对平面内位移u和v的影响。由于PMMA是线性弹性材料，因此使用实验确定的沿裂纹尖端周围几个轮廓的平面内位移来评估J积分值。注意，J个积分值是基于平面应力条件计算的。 J个积分值也由K_i和K_（II）获得。

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