Microstructural and Fractographic Analysis of Plastically Deformed Al-Zn-Mg Alloy Subjected to Combined High-Cycle Bending-Torsion Fatigue

Kowalski, A.; Ozgowicz, W.; Jurczak, Wojciech; Grajcar, A.; Boczkal, Sonia; Kurek, Andrzej

doi:10.3390/met8070487

Cited by 7 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should be noted that a of the first band of the beach marks was 1.5~2.5 mm and not accurate enough to track the very early crack initiation, for which further investigations were still needed. Moreover, the question of how steel grades and yield strengths influence the fatigue strength remains to be answered through microstructural and fractographic analysis [ 25 ].…”

Section: Test Resultsmentioning

confidence: 99%

Fatigue Tests and Analysis on Welded Joints of Weathering Steel

et al. 2022

View full text Add to dashboard Cite

To investigate the fatigue performance of vertical web stiffener to deck plate welded joints in weathering steel box girders, six specimens of the weathering steel (WS) Q345qNH, four specimens of WS Q420qNH, and four specimens of the plain carbon steel (CS) Q345q for comparison were tested by a vibratory fatigue testing machine, considering different steel grades, yield strengths, stiffener plate thicknesses, and weld types. The fatigue strength was evaluated based on S-N curves and the crack propagation was analyzed by linear elastic fracture mechanics (LEFM). The results show that the fatigue crack of the welded joints was initiated from the end weld toe of the deck plate and subsequently propagated both along the thickness of the deck plate and in the direction perpendicular to the stiffener plate. The fatigue crack initiation and propagation life of WS Q345qNH specimens were longer than those of CS Q345q specimens. The fatigue crack propagation life of WS Q345qNH specimens was longer than that of WS Q420qNH specimens, while the initiation life bore little relationship to the yield strength. Increasing the stiffener plate thickness effectively delayed crack initiation and slowed down its propagation. Compared with fillet welds, full penetration welds extended the fatigue crack propagation life, while no significant improvement was implied for the initiation life. The WS and CS specimens could be classified as having the same fatigue strengths by nominal stress, hot spot stress, and effective notch stress approaches, which were FAT 50, FAT 100, and FAT 225, respectively. Meanwhile, their material constants for LEFM were relatively close to each other.

show abstract

Section: Test Resultsmentioning

confidence: 99%

Fatigue Tests and Analysis on Welded Joints of Weathering Steel

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In the case of the 7003 alloy, the material for the tests was an industrial aluminium alloy of Al-Zn-Mg type in the form of a sheet with dimensions 400 × 200 × 20 mm [ 34 , 35 , 36 ]. Al-Zn-Mg alloys of the 7000 series show the highest strength potential among alloys for precipitation hardening.…”

Section: Methodsmentioning

confidence: 99%

“…The aluminium alloy group analyzed consists of six materials: 6082-T6 [ 31 ], 2017A-T4 [ 32 ], D-30 [ 33 ], and three types of Al-Zn-Mg type alloys in grade 7003 for plastic working after the low-temperature heat-plastic treatment [ 34 , 35 , 36 ]. The results were used to analyze the correctness of the proposed model of fatigue life estimation.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Prediction of Aluminum Alloys Considering Critical Plane Orientation under Complex Stress States

Kurek

2020

Materials

View full text Add to dashboard Cite

This publication is intended to present a new way of estimating the fatigue life of various construction materials. Carpinteri’s proposal was modified by replacing the fatigue limits ratio with the value of the normal to shear stress ratio for a given number of cycles. In this study, the proposed criterion and calculation model was verified for the selected group of aluminium alloys. The purpose of the analysis of the experimental studies was to check the effectiveness of the proposed method of estimating fatigue life under the applied bending and torsional load conditions. The results of the fatigue calculations are presented in graphical form by means of diagrams showing the comparison of design and experimental strength. Before fatigue life was calculated, the critical plane orientation according to Carpinteri’s model and the proposed model were determined. After analyzing the results of the comparison of design and experimental durability, it can be stated that the proposed fatigue life estimation algorithm gives satisfactory results for multiaxial cyclic loads.

show abstract

“…In [24][25], a fractographic analysis of fatigue fractures of aluminum alloys after cyclic bending and torsion tests was carried out. As a result, it was found that crack propagation occurs mainly by connecting successive cracks that are formed at adjacent grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

“…In [34], the effect of strain location on pitting corrosion of aluminum alloys [20,[24][25]32]. An analysis of the influence of various treatment methods on the fatigue limit of magnesium alloy [27] can be found in the literature.…”

Section: Introductionmentioning

confidence: 99%

Fatigue fracture cross-sections after cyclic tests with a combination of cyclic bending and torsion of samples made of aluminum alloy 6060

Łagoda,

Małecka,

Małys

et al. 2023

Eksploatacja i Niezawodność – Maintenance and Reliability

View full text Add to dashboard Cite

The paper presents the results of fatigue tests of the 6060 aluminum alloy. The test material was taken from the profiles used for production of side windows and external doors of the passenger trains by the RAWAG company. The tests were carried out for cyclic loads with pure bending, pure torsion, and two combinations of bending and torsion. Fatigue tests were performed at zero mean values. Using scanning electron microscopy, a fractographic analysis was made, which is a supplementary basis for considerations about the mechanism of initiation and development of fatigue cracks. Based on the appearance of individual zones and the characteristics of cracks, a picture of the behavior of the material under specific conditions was obtained. Finally, the plastic property of fatigue cracks was indicated. The work demonstrates the influence of aluminum alloy processing on the fatigue properties of this alloy during operation in order to obtain maximum reliability and safety of railway transport.

show abstract

Microstructural and Fractographic Analysis of Plastically Deformed Al-Zn-Mg Alloy Subjected to Combined High-Cycle Bending-Torsion Fatigue

Cited by 7 publications

References 21 publications

Fatigue Tests and Analysis on Welded Joints of Weathering Steel

Fatigue Tests and Analysis on Welded Joints of Weathering Steel

Fatigue Prediction of Aluminum Alloys Considering Critical Plane Orientation under Complex Stress States

Fatigue fracture cross-sections after cyclic tests with a combination of cyclic bending and torsion of samples made of aluminum alloy 6060

Contact Info

Product

Resources

About