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(1 廣西巖土力學(xué)與工程重點(diǎn)實(shí)驗(yàn)室, 桂林 541004； 2 桂林理工大學(xué)土木與建筑工程學(xué)院, 桂林 541004；3 柳州歐維姆機(jī)械股份有限公司, 柳州 545005)

［摘要］對(duì)不同應(yīng)變速率（8-58×10-3，4-29×10-2，2-15×10-1s-1）和索徑（5-2，15-2，50mm）的5組鋼絞線進(jìn)行了動(dòng)力試驗(yàn)。結(jié)果表明，不同應(yīng)變速率下的應(yīng)力-應(yīng)變曲線形狀大致相同；應(yīng)變速率每增加5倍，鋼絞線的屈服應(yīng)變約下降3%，極限應(yīng)變約下降5%，極限應(yīng)力和屈服應(yīng)力約提升3%；隨應(yīng)變速率的提高，鋼絞線在達(dá)到極限狀態(tài)前斷絲的趨勢(shì)增加；鋼絞線中芯單絲的滑移一般發(fā)生在動(dòng)荷載的低速加載階段，并且鋼絞線主要發(fā)生延性斷裂，斷口形式為銑刀式斷口，屬于宏觀延性斷口。

［關(guān)鍵詞］動(dòng)力試驗(yàn)； 鋼絞線； 應(yīng)變速率

中圖分類號(hào)：TU352-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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

*桂林理工大學(xué)博士啟動(dòng)基金資助（002401003499），廣西巖土力學(xué)與工程重點(diǎn)實(shí)驗(yàn)室基金資助項(xiàng)目(2015-A-03)。

作者簡介：邢心魁，博士，教授，碩士生導(dǎo)師，Email:597983647@qq.com。