On subsurface initiated failures in marine bevel gears

被引：14

作者：

Bohme, Stephan Andre ^{[1
]}

Merson, Dmitry ^{[2
]}

Vinogradov, Alexei ^{[1
]}

机构：

[1] Norwegian Univ Sci & Technol NTNU, Dept Mech & Ind Engn, N-7491 Trondheim, Norway

[2] Togliatti State Univ, Inst Adv Technol, Tolyatti 445020, Russia

来源：

ENGINEERING FAILURE ANALYSIS | 2020年 / 110卷

关键词：

Hardness - Gear teeth - Fatigue of materials - Shear stress;

D O I：

10.1016/j.engfailanal.2020.104415

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

In this study, the microstructure of three large bevel gears with evident tooth flank fractures is investigated to define the effect of material inhomogeneities on the probability of subsurface initiated fatigue in case hardened structural steels. The observed micro-segregation structure in the core and case/core interface of the gear teeth features a bainitic and martensitic matrix with large variations in the local hardness. Applying an orthogonal shear stress based subsurface fatigue model, alongside a hardness map obtained through multiple hardness profile measurements, an improved method to predict tooth flank fracture is proposed.

引用

页数：10