Abstract

The uniaxial tensile mechanical properties of D1 wheel steel and U71MnG rail steel were investigated experimentally at a wide range of strain rates from 0.0001 to 100 s⁻¹. Influence of the strain rate on stress–strain response, ductility, fracture morphology and energy absorption was analyzed and discussed, respectively. Both D1 wheel steel and U71MnG rail steel are demonstrated to be strain rate sensitive, and D1 wheel steel specimens generally exhibit a larger elongation and a better ductility than U71MnG rail steel specimens at each strain rate. The fracture mechanism of D1 wheel steel is a ductile fracture at lower strain rates and quasi-ductile fracture at higher strain rates, while U71MnG rail steel tends to a quasi-ductile fracture at lower strain rates and a brittle fracture at higher strain rates. The specific energy absorption values of D1 wheel steel and U71MnG rail steel increase with the increase in true strain and elevated strain rate. Finally, the Johnson–Cook model is adopted to predict the stress–strain response of wheel/rail steels studied, and a better agreement is found.

中文翻译：

---

中等应变率拉伸作用下铁路车轮/钢轨的试验研究与本构描述

摘要

在0.0001至100 s ^-1的宽应变率范围内，对D1车轮钢和U71MnG轨道钢的单轴拉伸力学性能进行了实验研究。。分别分析和讨论了应变速率对应力应变响应，延性，断裂形态和能量吸收的影响。已证明D1车轮钢和U71MnG铁路钢都对应变速率敏感，并且在每个应变速率下，D1车轮钢试样通常比U71MnG铁路钢试样具有更大的伸长率和更好的延展性。D1车轮钢的断裂机理是在较低应变速率下为延性断裂，在较高应变速率下为准延性断裂，而U71MnG钢轨钢在较低应变速率下趋于准延性断裂，在较高应变速率下趋于脆性断裂。D1车轮钢和U71MnG轨道钢的比能量吸收值随真实应变的增加和应变率的提高而增加。最后，