Very high cycle fatigue measuring techniques

Stanzl-Tschegg, Stefanie E.

doi:10.1016/j.ijfatigue.2012.11.016

Cited by 171 publications

(113 citation statements)

References 50 publications

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“…The machine working principle can be found in the literature. [24][25][26][27] A detailed description of the experimental procedure used during this study can be found in a previous work from the authors. [9] Briefly, a continuous excitation is applied on the specimen to solicit at a strain ratio of R = À 1.…”

Section: Fatigue Testsmentioning

confidence: 99%

Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

Cervellon

Cormier

Mauget

et al. 2018

Metall Mater Trans A

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Section: Fatigue Testsmentioning

confidence: 99%

Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

Cervellon

Cormier

Mauget

et al. 2018

Metall Mater Trans A

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“…In the more recent works presented by Stefanie Stanzl-Tschegg et al [7][8], the principles and testing procedures of very high cycle fatigue tests are overviewed. Findings in the areas of crack formation, non-propagation of small cracks, long crack propagation and thresholds, effects due to frequency, superimposed and variable amplitude loading, are reported and discussed as well.…”

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

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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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“…The relationship between the stress amplitudes (r a ) and the number of cycles to failure (N) values was determined using the fatigue data. [45] In this study, five type of samples (as summarized in Table II) were examined under similar conditions, and the average value was used to obtain each data point for the formation of the S/N curves. Figure 12 illustrates the fatigue and fretting fatigue lives of sample 1 (as-received).…”

Section: Fretting Fatigue Lifementioning

confidence: 99%

Evaluation of the Mechanical Properties of AA 6063 Processed by Severe Plastic Deformation

Jafarlou

Zalnezhad

Faraji

et al. 2015

Metall Mater Trans A

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In this study, the mechanical properties, including surface hardness, tensile strength, fatigue, and fretting fatigue behavior of AA 6063 processed by equal channel angular pressing as the most efficient severe shear plastic deformation (SPD) technique, were investigated. Following the SPD process, samples were subjected to heat treatment (HT), hard anodizing (HA), and a combination of HT and HA. Rotating-bending fretting fatigue tests were performed to explore the samples' response to the fretting condition. From the experimental fatigue and fretting fatigue tests, it was apparent that the SPD treatment had a positive effect on enhancing the fatigue and fretting fatigue lives of the samples at low and high-cyclic loads compared with the HT technique by 78 and 67 pct, and 131 and 154 pct respectively. The results also indicate that the SPD + HT technique significantly increased the fatigue and fretting fatigue lives of the samples at high and low cycles by 15.56 and 8.33 pct, and 14.4 and 5.1 pct respectively, compared with the SPD method. HA of AA6063 increased the fatigue and fretting fatigue lives of SPD + HT-processed samples at low cycle by 15.5 and 18.4 pct respectively; however, at high cycle, HA had reverse effects, whereby the fatigue and fretting fatigue lives of SPD + HT-processed samples decreased by 16.7 and 30 pct, respectively.

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Very high cycle fatigue measuring techniques

Cited by 171 publications

References 50 publications

Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

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

Evaluation of the Mechanical Properties of AA 6063 Processed by Severe Plastic Deformation

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