| 吴志煜*,王时越,杨锡阶,刘国寿.扭转预应变对35CrMo钢低周疲劳性能的影响[J].实验力学,2013,28(4):511~516 |
| 扭转预应变对35CrMo钢低周疲劳性能的影响 |
| Effect of Torsional Prestrain on Low Cycle Fatigue Behavior of 35CrMo Steel |
| 投稿时间：2012-11-28 修订日期：2013-02-28 |
| DOI：10.7520/1001-4888-12-176 |
| 中文关键词: 35CrMo钢 扭转 预应变 低周疲劳 疲劳断口 |
| 英文关键词:35CrMo steel torsion prestrain low cycle fatigue fatigue fracture surface |
| 基金项目:云南省教育厅科学研究基金项目(No.2010Y383)资助 |
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| 中文摘要: |
| 自行设计了疲劳和扭转两用的试样,通过对试件预扭转不同的角度,系统研究35CrMo钢在不同扭转预应变下的低周疲劳性能,分析了扭转预应变后35CrMo钢的循环硬化软化特性、滞后回线、塑性应变能及循环弹性模量的变化规律,并对疲劳断口进行扫描电镜分析。结果表明：4种预扭转处理过的试件均表现出明显的循环软化行为,且循环软化规律及衰减的程度基本相同;循环应力范围及疲劳寿命随着预扭转角的增大而降低;应力应变滞后回线中加卸载曲线间的宽度随着预扭转角的增大而减小;塑性应变能都随着循环次数的增大而增加,且随着预扭转角的增大其增大速率下降;循环弹性模量都随着循环次数的增加而逐渐降低,且随着预扭转角的增大其衰减趋势减缓。 |
| 英文摘要: |
| Dual-purpose specimens for both fatigue and torsion test were self-designed and were subjected to pre-torsion at different angles. Low-cycle fatigue behavior of 35Cr Mo steel specimens with different torsional prestrains was systematically studied. The variation patterns of cycle hardening-softening properties, hysteresis loop, plastic strain energy and cycle elastic modulus of 35CrMo steel specimens with torsional prestrain were analyzed, and fatigue fracture surfaces were analyzed by scanning electron microscopy (SEM). Results show that all four kinds of specimens subjected to beforehand torsion present obvious cycle softening behaviour with basically same cycle softening patterns and attenuation level; the cyclic stress range and fatigue life reduce with the beforehand torsion angle increase; the width between loading and unloading curves in the stress-strain hysteresis loop decreases with the beforehand torsion angle increase; the plastic strain energy increases with the fatigue cycle number increase, and its increasing rate descends with the beforehand torsion angle increase; the cycle elastic modulus gradually reduces with the fatigue life cycle increase, and its attenuation trend slows down with the beforehand torsion angle increase. |
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