三维DIC在GFRP锚杆拉伸力学性能测试中的应用  

Application of 3D-DIC in Tensile Mechanical Properties Test for Glass Fiber Reinforced Plastic Bolt

作　　者：朱飞鹏[1] 王京荣[1] 雷冬[1] 何小元[2] 

机构地区：[1]河海大学力学与材料学院,南京210098 [2]东南大学工程力学系,南京210096

出　　处：《实验力学》2014年第3期302-309,共8页Journal of Experimental Mechanics

基　　金：国家自然科学基金(11002048)资助

摘　　要：随着玻璃纤维增强塑料(GFRP)广泛运用于轨道交通及边坡加固中,其力学性能的测试显得尤为重要。基于三维数字图像相关(DIC)方法,研究了三种不同加载速率下GFRP锚杆的拉伸力学性能,分别得到了应力-应变曲线及弹性模量、抗拉强度、最大力总延伸率等参数。实验结果表明,螺旋状变截面锚杆的轴向应变呈非均匀分布,由三维DIC得到的锚杆弹性模量结果一致性优于传统的接触式引伸计方法,GFRP锚杆几乎呈线性分布的应力-应变曲线表明该材料为典型的脆性材料。With glass fiber reinforced plastic （GFRP） is widely applied in rail traffic and slope reinforcement, its mechanical property measurement becomes particularly important. Based on three-dimensional digital image correlation （3D-DIC） technique, tensile mechanical properties of GFRP bolt subjected to three different loading rates were studied and parameters such as stress-strain curve, modulus of elasticity, tensile strength and total elongation percentage produced by maximum force were obtained respectively. Exprimental results indicate that the axial strain distribution of spiral specimen with variable cross-section is nonuniform. Modulus of elasticity result consistency of GFRP bolts obtained from 3D-DIC is better than that from conventional contact extensometer method, and the almost linear stress-strain curve of GFRP bolt indicates that this is a typical brittle material.

关 键 词：三维数字图像相关 弹性模量 玻璃纤维增强塑料 引伸计 抗拉强度 延伸率 

分 类 号：O348.1[理学—固体力学]