An understanding of very high cycle fatigue of metals

Marines, I; Bin, Xi; Bathìas, Claude

doi:10.1016/s0142-1123(03)00147-6

Cited by 172 publications

(104 citation statements)

References 6 publications

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“…This interface is also used to determine delays in the exciter that are very hard to predict otherwise. Once the primary settings are set and the triggers have been determined, there is no need to run the trigger setup again; (3) Acquisition display (Fig. 9) -The acquisition display shows the current time signal block and the history for a single run.…”

Section: Data Acquisition Processing and Control Systemmentioning

confidence: 99%

See 1 more Smart Citation

Automation in Strain and Temperature Control on VHCF with an Ultrasonic Testing Facility

Lage

Ribeiro

Montalvão

et al. 2014

Application of Automation Technology in Fatigue and Fracture Testing and Analysis

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Increased safety and reliability in mechanical components became a subject of prime importance over the past recent years. Therefore, a proper understanding of damage and fracture mechanics in materials and components designed to withstand Very High Cycle Fatigue (VHCF) loadings is extremely important nowadays. However, conventional machines used for fatigue testing are very time-consuming and costly in order to perform VHCF tests. Ultrasonic machines have been introduced as a way to increase the number of cycles in fatigue testing up to 1E 8 to 1E 10 cycles within a considerably reduced amount of time. Nevertheless, the accurate measurement of the parameters that influence fatigue life at ultrasonic frequencies (e.g., stress, displacement, strain-rate, temperature and frequency) is still a matter of concern and on-going development. Due to the high frequencies involved in VHCF testing, a huge amount of heat is generated over the specimen, which greatly affects the variables determining the fatigue behavior. This paper describes the design and instrumentation of an ultrasonic fatigue testing machine that operates at 20 kHz working frequency. Among other features, it incorporates automated strain and temperature control. In order to run automated tests, a closed loop monitoring and control system was developed based on the measured temperature and displacement amplitudes. Temperature readings are made with a pyrometer and thermography camera and displacement is monitored at the free end of the specimen with a high resolution laser. The machine's power output is continuously adjusted from the displacement readings, so that the stress variations within the specimen are as flat as possible. When temperature increases above a certain set value, a cooling function is triggered and the test is interrupted until the specimen is cooled down. Data is acquired, managed and processed with a data acquisition device working at 400 kHz sampling frequency.The advantages and limitations of metal fatigue testing at very high frequencies are discussed in this paper, with special emphasis on the strain and temperature control issues. Comparison of tests carried out with and without both displacement and temperature control are made on two metallic alloys, copper 99% and carbon steel, with the determination of S-N curves.

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Section: Data Acquisition Processing and Control Systemmentioning

confidence: 99%

“…Latest developments in the ultrasonic technique are presented by Bathias et al [1][2][3][4][5]. An extensive review of the fundamentals on VHCF fatigue using ultrasonic methods, including considerations on the machine development, its performance and applications, can be found in these works.…”

Section: Introductionmentioning

confidence: 99%

Automation in Strain and Temperature Control on VHCF with an Ultrasonic Testing Facility

Lage

Ribeiro

Montalvão

et al. 2014

Application of Automation Technology in Fatigue and Fracture Testing and Analysis

View full text Add to dashboard Cite

show abstract

“…The concepts of infinite fatigue life and asymptotic S-N curve have been proven false in many occasions [8]. The lack of a fatigue limit in certain materials having a face-centred-cubic (fcc) crystal structure, such as aluminium alloys, is a known phenomenon.…”

Section: Introductionmentioning

confidence: 99%

“…Very High Cycle Fatigue) regime for materials used in components that experience over 1e8 load cycles during their lifetimes [4,12,7]. For example, the fatigue strength of a high strength steel can change as much as 50-200 MPa from 1e6 cycles to 1e9 cycles [8].…”

Section: Introductionmentioning

confidence: 99%

QT steel High Cycle Fatigue Testing with Ultrasonic

Korhonen¹,

Kuoppala²,

Väntänen³

et al. 2017

RakMek

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“…Furthermore, increasingly more attention has been given to material behaviour in the very high cycle regime from an experimental point of view. The general belief that steel experiences no alteration in its properties after reaching its fatigue limit at 10 7 cycles has been invalidated [21], [22], [23]. In this context, this paper provides a tool for rapid automatized time-advance that allows taking numerical simulations beyond the limit of 10 7 cycles in reasonable computational time.…”

Section: Introductionmentioning

confidence: 99%

High cycle fatigue simulation: A new stepwise load-advancing strategy

Barbu

Oller

Martı́nez

et al. 2015

Engineering Structures

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Abstract.A stepwise load-advancing strategy for cyclic loading will be presented in this paper that yields convergence in reasonable computational time for highly nonlinear behaviour occurring past the S-N curve. The algorithm is also effective when dealing with combinations of cyclical loads. The strategy is coupled to a continuum damage model for mechanical fatigue analysis. A brief overview of the constitutive model is also presented although it is not the main focus of this work. The capabilities of the proposed procedure are shown in two numerical examples. The model is validated by comparison to experimental results.

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An understanding of very high cycle fatigue of metals

Cited by 172 publications

References 6 publications

Automation in Strain and Temperature Control on VHCF with an Ultrasonic Testing Facility

Automation in Strain and Temperature Control on VHCF with an Ultrasonic Testing Facility

QT steel High Cycle Fatigue Testing with Ultrasonic

High cycle fatigue simulation: A new stepwise load-advancing strategy

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