Izvorni znanstveni članak
https://doi.org/10.18048/2022.04.18
Assessing the Compression Fatigue of the Welded Test Specimens
Šimun Sviličić
; Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, Zagreb, Croatia
Smiljko Rudan
orcid.org/0000-0002-5904-5938
; Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, Zagreb, Croatia
Prilozi: Errata Corige.pdf
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.
Ključne riječi
Compression fatigue; R ratio; MAG welding; residual stress; coupled thermal-mechanic; S355
Hrčak ID:
278713
URI
Datum izdavanja:
24.4.2022.
Posjeta: 773 *