(1 广西岩土力学与工程重点实验室, 桂林 541004； 2 桂林理工大学土木与建筑工程学院, 桂林 541004；3 柳州欧维姆机械股份有限公司, 柳州 545005)

［摘要］对不同应变速率（8-58×10-3，4-29×10-2，2-15×10-1s-1）和索径（5-2，15-2，50mm）的5组钢绞线进行了动力试验。结果表明，不同应变速率下的应力-应变曲线形状大致相同；应变速率每增加5倍，钢绞线的屈服应变约下降3%，极限应变约下降5%，极限应力和屈服应力约提升3%；随应变速率的提高，钢绞线在达到极限状态前断丝的趋势增加；钢绞线中芯单丝的滑移一般发生在动荷载的低速加载阶段，并且钢绞线主要发生延性断裂，断口形式为铣刀式断口，属于宏观延性断口。

［关键词］动力试验； 钢绞线； 应变速率

中图分类号：TU352-1文献标识码：A文章编号：1002-848X(2019)02-0103-04

Dynamic test study of steel strand under different strain rates and cable diameters

Xing Xinkui1,2, Zha Yu 1,2, Zhu Yuan3, Wu Fangjun1,2

(1 Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin 541004, China; 2 College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004, China; 3 Liuzhou OVM Machinery Co., Ltd., Liuzhou 545005, China)

Abstract:Dynamic tests of five groups of steel strands with different strain rate (8-58×10-3, 4-29×10-2, 2-15×10-1s-1) and cable diameter (5-2, 15-2, 50mm) were carried out. The results show that the shape of the stress-strain curve is approximately the same under different strain rate; yield strain decreases by 3% and the ultimate strain decreases by 5% and the ultimate stress and yield stress increase by 3% for each five-fold increase of strain rate; the tendency of steel strand breakage increases before reaching the ultimate state with the increase of strain rate; and the slippage of the core monofilament in the steel strand usually occurs in the low-speed loading stage of dynamic load, and the ductile fracture mainly occurs in the steel strand, with the fracture form of milling cutter fracture which belongs to macro ductile fracture.

Keywords:dynamic test; steel strand; strain rate

*桂林理工大学博士启动基金资助（002401003499），广西岩土力学与工程重点实验室基金资助项目(2015-A-03)。

作者简介：邢心魁，博士，教授，硕士生导师，Email:597983647@qq.com。