Fatigue crack growth in 2017A-T4 alloy subjected to proportional bending with torsion

Abstract

The paper presents the results of tests on the fatigue crack growth for a constant moment amplitude under combined bending with torsion in the aluminium alloy AW-2017A-T4. The tests were performed under different values of the load ratio R. Plane specimens with stress concentrators in form of the external one-sided sharp notch were tested. A non-uniform fatigue cracks growth on both lateral surfaces of specimens was observed during experimental tests. Fatigue cracks were developing in the specimens in two stages; quarter-elliptic edge cracks were observed at the beginning, then evolving into through cracks.

Effect of Specimen Thickness and Stress Intensity Factor Range on Plasticity-Induced Fatigue Crack Closure in A7075-T6 Alloy

“…As for the measurement of K op , during a constant ΔK test, the values were measured multiple times (up to 4 times) at an arbitrary crack length. In the FCG experiments, experiments using three-point bending [ 16 ] have been also used relatively often.…”

Profile and Areal Surface Parameters for Fatigue Fracture Characterisation

“…The material grades studied in the present research were: (a) 10HNAP weather-resistant structural steel [ 39 ]; (b) S355J2 structural steel [ 41 ] and (c) AW-2017A-T4 aluminium alloy [ 42 ]. Components manufactured from the tested metal alloys are popular in the machine building industry, and therefore can undergo fatigue.…”

“…Fatigue tests of S355J2 steel specimens carried out by Marciniak [ 41 ] encompassed non-proportional bending–torsion histories with different ratios of the maximum shear stress to the maximum normal stress (i.e., λ = τ max /σ max ). In the case of the AW-2017A-T4 aluminium alloy specimens, tests were conducted by Faszynka [ 42 ] under different bending-to-torsion amplitude ratios. The stress ratios (R) used in this experimental campaign were R = −1, −0.5 and 0 ( Table 3 ) [ 32 ].…”

Fatigue crack growth in welded S355 specimens subjected to combined loadings

“…any kinds of research are devoted at describing the behaviour of crack growth in structural component [1][2][3][4][5][6] and joints [7][8][9][10]. Fatigue crack growth in welded joints is still a very attractive engineering problem, because of the occurrence of various types of crack initiators, such as geometrical and microstructural notches or residual M stresses, as well as the presence of numerous non-metallic inclusions and weld defects.…”