Effect of non-zero mean stress bending-torsion fatigue on fracture surface parameters of 34CrNiMo6 steel notched bars

Production Engineering Archives

Szala Mirosław¹  Trembacz Jarosław²  Branco Ricardo³  Costa José³  Macek Wojciech⁴ 

[1] Lublin University of Technology, Faculty of Mechanical Engineering, Nadbystrzycka 36D, 20-618Lublin, Poland;Opole University of Technology,Prószkowska 76, 45-758Opole, Poland;University of Coimbra, CEMMPRE, Department of Mechanical Engineering, Coimbra, Portugal;University of Occupational Safety Management, Bankowa 8, 40-007Katowice, Poland;

关键词: multiaxial fatigue;    bending-torsion;    notch effect;    fatigue fracture;    surface topography;   

DOI  :  10.30657/pea.2020.26.30

来源: DOAJ

【 摘 要 】

Modern methods of testing materials require the use of the latest technologies and combining measurement and calculation methods. It is important to find a quantitative way of describing, among other things, the failures so that it can help to design with high accuracy. This paper studies loading orientations on crack shape and fracture surface changes. The advantage of the entire fracture surface method is simplicity and applicability in studies on other materials, shapes and loadings. A higher values of fracture surface parameters (Sx, Vx) was observed in failure specimens with lower σ/τ (B/T) ratios. It has been observed that largest crack lengths with a small number of cycles occur for loading combinations different then B=T. As well as analyzed surface parameters Sx, Vx, are higher for larger number of cycles to crack initiation (Ni) values.

【 授权许可】

Unknown