32 documents found, page 1 of 4

Synergistic effect of fatigue and hydrogen-induced damage under asymmetric load...

This study investigates the synergistic assessment of cyclic plasticity damage and hydrogen-induced cracking of transformation-induced plasticity (TRIP) steel subjected to asymmetric strain-controlled fatigue loading. The presence of hydrogen in TRIP steel hardening observed in hydrogen-free specimens is attributed to the predominance of hardening induced by martensitic results in cyclic softening throughout it...

Reduction in Errors in Roughness Evaluation with an Accurate Definition of the ...

Characterization of surface topography, roughly divided into measurement and data analysis, can be valuable in the process of validation of the tribological performance of machined parts. Surface topography, especially the roughness, can respond straightly to the machining process and, in some cases, is defined as a fingerprint of the manufacturing. When considering the high precision of surface topography stud...

Topography measurement methods evaluation for entire bending-fatigued fracture ...

In this paper, the methods of compensation of differences in the results of entire bending-fatigued fracture surface topographies were presented. The roughness evaluation was performed with a focus variation microscope and confocal surface topography measurement techniques. The differences in the ISO 25178 roughness parameters were investigated and procedures for their compensation were studied. It was found th...

Effect of L‐T and S‐T orientations on fatigue crack growth in an aluminum 7050‐...

This study is focused on the anisotropic fatigue crack growth (FCG) behavior of an aluminum AA7050-T7451 plate. L-T and S-T orientations were studied in M(T) samples with W = 50 mm, in mode I loading, with R-ratio of +0.05. A numerical approach was used, assuming that crack tip plastic strain is the crack driving force. A purely kinematic elastic–plastic model was calibrated using experimental data from low cyc...

Computational Methods for Fatigue and Fracture [editorial]

Fracture Surface Behavior of 34CrNiMo6 High-Strength Steel Bars with Blind Hole...

The present study evaluates the fracture surface response of fatigued 34CrNiMo6 steel bars with transverse blind holes subjected to bending with torsion loading. The analysis of the geometric product specification was performed by means of height parameters Sx, functional volume parameters Vx, and fractal dimension Df. Surface topography measurements were carried out using an optical profilometer with focus var...

High-Strength Low-Alloy Steels

Strain sequence effect on fatigue life and fracture surface topography of 7075-...

The paper studies the effect of strain-loading sequence on fatigue lifetime and fracture surface topographies in 7075-T651 aluminum alloy specimens. Fatigue tests were performed in two ways: (i) constant-amplitude loading and (ii) two series of variable amplitude loading with non-zero mean strain values. The topography of the fatigue fractures was measured over their entire surfaces with the help of an optical ...

The Evaluation of Front Shapes of Through-the-Thickness Fatigue Cracks

Fatigue failure of structural components due to cyclic loading is a major concern for engineers. Although metal fatigue is a relatively old subject, current methods for the evaluation of fatigue crack growth and fatigue lifetime have several limitations. In general, these methods largely disregard the actual shape of the crack front by introducing various simplifications, namely shape constraints. Therefore, mo...

Structural Integrity of Polymeric Components Produced by Additive Manufacturing...

In the work presented herein, the structural integrity of polymeric functional components made of Nylon-645 and Polylactic acid (PLA) produced by additive manufacturing (Fused Deposition Modelling, FDM) is studied. The PLA component under study was selected from the production line of a brewing company, and it was redesigned and analyzed using the Finite Element Method, 3D printed, and installed under real serv...