MODEL FOR FATIGUE LIFETIME PREDICTION OF TORSION BARS SUBJECTED TO PLASTIC PRESETTING

被引：0
|
作者：
Mocilnik, Vinko [1 ]
Gubeljak, Nenad [2 ]
Predan, Jozef [2 ]
机构：
[1] ERD doo Engn Design & Dev, Dravograd 2370, Slovenia
[2] Univ Maribor, Fac Mech Engn, SLO-2000 Maribor, Slovenia
来源：
TEHNICKI VJESNIK-TECHNICAL GAZETTE | 2011年 / 18卷 / 04期
关键词：
presetting; torsion; spring-bars; fatigue; lifetime; cyclic fatigue; torque; spring steel; STRESS; OVERLOADS;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The torsion presetting of a spring-bar is a common technique for extending the elastic twist-angle and increasing torque, but it reduces fatigue lifetime. Spring-bars are used as shock absorbers in caterpillar machines. Spring-bars, made from high strength fine-grain steel, grade VCN, provide a high level of absorbed energy. Any slight change in the presetting procedure has a strong influence on fatigue-lifetime. Within the same loading range, springs can exhibit low-cyclic or high-cyclic fatigue behavior regarding different presetting levels. A model for fatigue-lifetime and shear-stress levels is proposed on the basis of performed tests. Considering prescribed fatigue tests, it is possible to optimize a spring bar's geometry, in order to survive the required number of cycles.
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页码：537 / 546
页数：10
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