Mean Stress Effect on the Axial Fatigue Strength of DIN 34CrNiMo6 Quenched and Tempered Steel

被引:22
|
作者
Pallares-Santasmartas, Luis [1 ]
Albizuri, Joseba [1 ]
Aviles, Alexander [2 ]
Aviles, Rafael [1 ]
机构
[1] Univ Basque Country, Escuela Ingn Bilbao, Dept Mech Engn, Alameda Urquijo S-N, Bilbao 48013, Spain
[2] IDOM Engn & Consultancy, Adv Design & Anal, Ave Zarandoa, Bilbao 48015, Spain
来源
METALS | 2018年 / 8卷 / 04期
关键词
DIN; 34CrNiMo6; steel; Haigh diagram; mean stress; high cycle fatigue; energetic fatigue methods; HIGH-CYCLE; LIFE FATIGUE; LIMIT; BEHAVIOR; CRITERIA;
D O I
10.3390/met8040213
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The present study consists of a theoretical and experimental investigation of the effect of axial mean stresses on the high cycle fatigue behaviour of DIN 34CrNiMo6 high strength steel in quenched and tempered conditions. The axial S-N curves under 4 different stresses ratios were obtained. Experimental results show that increasing the value of the tension mean stresses gradually reduces the axial stress amplitude the material can withstand without failure. Moreover, the compressive mean stresses show a beneficial effect in terms of the axial fatigue strength, resulting in a non-symmetrical Haigh diagram. A historic review of the axial mean stress effect is presented, showing the shape of the Haigh diagrams for ductile metals and presenting the most-known empirical and physical theories. The results for this steel are compared with the physical theories of Findley based on the critical plane; the Froustey's and Marin's methods, based on energetic theories; and the Crossland invariants method based on the Gough's theory of fatigue damage. Taking into account the experimental results, a physical fatigue function based on energetic considerations is proposed. Its application to the fatigue case with mean stresses can be interpreted in terms of a balance of elastic energies of distortion and volume change. Macro-analyses of specimen fracture appearance were conducted in order to obtain the fracture characteristics for different mean stress values.
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页数:19
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