Naslov
Assessing the Compression Fatigue of the Welded Test Specimens

Autori
Sviličić Šimun ; Smiljko Rudan

Izvornik
Pomorski zbornik (0554-6397) Special Edition (2022), 4; 245-263

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
zamor, R faktor, MAG zavarivanje, rezidualna naprezanja
(compression fatigue, R ratio, MAG welding, residual stress)

Sažetak
The focus of this paper is on compression fatigue life in welded test specimen. Considered test specimen is highly complex due to multi-layer welding and production errors affecting its topology. Test specimen is made from S355 steel which is used for both base material and weld. Compression fatigue analysis is seldom performed as compression positively affects fatigue life. At the same time, during MAG welding residual stresses affect the fatigue life, decreasing it significantly. Finite element method (FEM) is applied to estimate compression fatigue life of the welded test specimen and obtained fatigue curve is compared to the experimental curve. Experimental curves are given for different stress ratios: R= -1, and R= -∞. Analysis consists of thermal and structural analysis using FEM method and fatigue analysis which is based on FEM results. FEM thermal simulation of welding with constant initial temperature is performed first and followed by nonlinear structural analysis for assessment of the residual stresses due to heat expansion. Fatigue parameters are determined using Universal slope method.

Izvorni jezik
Engleski

Znanstvena područja
Brodogradnja, Strojarstvo

POVEZANOST RADA