Very High Cycle Fatigue

Zimmermann, Martina

doi:10.1007/978-981-10-6855-3_43-1

Cited by 10 publications

(4 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To save time investigating high cycle fatigue (HCF) and VHCF, one can use the ultrasonic fatigue testing (USFT) method 4 . USFT of a steel specimen under 20 kHz allows to reach 10 9 cycles in few days under pulse/pause cycling mode 5 …”

Section: Introductionmentioning

confidence: 99%

On the formation of ridges and burnished debris along internal fatigue crack propagation in 42CrMo4 steel

Seleznev

Weidner

Biermann

2020

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

A detailed microscopic analysis of fracture surfaces of 42CrMo4-hardened steel after ultrasonic fatigue testing revealed globular and cylindrical particles located in ridges along the crack propagation direction. Observed particles could be easily taken for non-metallic inclusions; however, chemical analysis showed that they are of the same composition as the steel matrix. The formation of such round-shaped debris was found to be a result of cutting out the matrix fragments by 'en passant' cracks interaction and their subsequent fretting burnishing. Possible correlation of the parameters of ridges and debris with cyclic plastic zone width and martensite structure is discussed.42CrMo4 steel, en passant cracks, fretting, high cycle fatigue, ultrasonic fatigue testing (USFT)

show abstract

Section: Introductionmentioning

confidence: 99%

On the formation of ridges and burnished debris along internal fatigue crack propagation in 42CrMo4 steel

Seleznev

Weidner

Biermann

2020

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…For instance, it takes about 46 h for a servo-hydraulic test machine running at 60 Hz to complete 10 7 rounds for a point on a S-N curve in a uniaxial fatigue test and more factors have been identified as high cost and limited availability for biaxial testing, complexity of resonant testing procedures as they require special controlling devices, difficulty in obtaining fatigue limit strengths data for materials subjected to more complex loading, and limitation to uniaxial tension including ultrasonic machines operating at 20 kHz [8][9][10][11]. Although ultrasonic fatigue testing systems can address some of these issues, they have limitations such as specimen size and shape limits, test monitoring, equipment complexity, and costs [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Testing Approach Utilising Machining Cutting Forces and Fixture Design

Okenyi,

Afazov,

Mansfield

et al. 2024

Exp Mech

View full text Add to dashboard Cite

Background Traditional fatigue testing methods can be expensive due to the need of specialised equipment for engineering materials and structures. Thus, a new fatigue testing approach utilising machining cutting forces to induce cyclic stresses, enabling fatigue life assessment of engineering materials and structures, has been developed. Objective This research aims to develop and verify a new testing approach using machining processes to enable the fatigue life assessment of engineering materials and structures. This is achieved by the utilisation of machining-induced cutting forces to generate cyclic stresses into welded samples used in applications of wind turbine monopile structures. Methods The methodology employes the development of a fixture encompassed with strain gauges and purposefully designed machining operations to mimic the cyclic stresses experienced in real applications. The machining-based fatigue testing approach was demonstrated on welded samples by replicating cyclic stresses of offshore wind turbine monopiles subject to in-service loads. Results The results show that rapid fatigue testing of engineering materials and structures is possible by utilising existing machine tools and centres, which are widely accessible to industry. Cyclic stresses were induced in welded structural steel samples proving the concept of this method. Conclusion This novel fatigue testing method showed that cyclic stresses can be induced by machining cutting forces to address real application needs. The key advantages are that this method can be quickly set up in industry, enabling fast fatigue testing that can lead to reduction of lead times for product and process development of industrial components.

show abstract

“…Mechanical properties of AZ31 alloy were also investigated in the low-cycle fatigue regime (LCF). [29] A new term based on the mean stress and the elastic modulus was put forward in order to express the fatigue life more effectively.…”

Section: Introductionmentioning

confidence: 99%

Effect of Friction Stir Processing on the Fatigue Performance of AZ31 Magnesium Alloy

et al. 2023

View full text Add to dashboard Cite

Herein, the cyclic mechanical behavior of AZ31 magnesium alloy after multipass friction stir processing (FSP) is investigated up to the very high‐cycle fatigue (VHCF) regime. The grain refinement and texture evolution after processing are evaluated to enhance the understanding of the fatigue response. Although ultimate tensile strength and ductility of the friction stir processed AZ31 increase up to about 320 MPa and 25%, respectively, the fatigue performance deteriorates in comparison with that of the as‐received condition due to the low yield strength and texture evolution after processing. Furthermore, analysis of fracture surfaces of the samples after cyclic loading reveals that the as‐received AZ31 is more prone to brittle fracture with multiple‐origin fatigue failure even at low stress amplitudes. On the contrary, the dominant failure mechanisms of the friction stir processed samples are initiation and propagation of cracks originating from the surface, porosities, and grain size inhomogeneity. Nevertheless, the capability of FSP for providing superior crack initiation resistance in the VHCF regime is demonstrated as a significant contribution. Based on a detailed study of prevalent microstructural features, processing–property–damage relationships are established indicating the major effect of FSP on the final performance of the AZ31 magnesium alloy.

show abstract

Very High Cycle Fatigue

Cited by 10 publications

References 31 publications

On the formation of ridges and burnished debris along internal fatigue crack propagation in 42CrMo4 steel

On the formation of ridges and burnished debris along internal fatigue crack propagation in 42CrMo4 steel

Fatigue Testing Approach Utilising Machining Cutting Forces and Fixture Design

Effect of Friction Stir Processing on the Fatigue Performance of AZ31 Magnesium Alloy

Contact Info

Product

Resources

About