Details

Autor(en) / Beteiligte

• Zhu, Qiuyan
• Lu, Pengmin
• Xiang, Qingyi

Titel

Fatigue life evaluation of web butt welding structure on boom of excavator by hot spot stress approach

Ist Teil von

• Engineering failure analysis, 2020-07, Vol.113, p.104547, Article 104547

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •More accurate stress value obtained by sub-model method.•The welding structure of boom is analyzed by the combination of the finite element method with hot spot approach.•An effective method for predicting the life of excavator boom is proposed. The working load of excavator is complex and the working environment is bad. As the main part of excavator, the boom bears a large complex load and is prone to fatigue damage. A large hydraulic excavating boom is taken as the research object in this paper, aiming at the damaged position in the platform fatigue test, that is, the web butt weld on the root of the boom, and the fatigue life of this part is evaluated by means of hot spot stress and load spectrum. The result shows that the theoretical lifetime of this part is 4148 h, which is completely agree with the equivalent life 4278 h when the cracks appeared in bench fatigue tests. Accordingly, the hot spot stress approach is suitable for the fatigue life evaluation of the boom, and its accuracy is high.