Bending and Torsion Fatigue-Testing Machine Developed for Multiaxial Non-Proportional Loading

Ogawa, Fumio; Shimizu, Yusuke; Morishita, Takahiro; Itoh, Takamoto

doi:10.3390/met9101115

Cited by 14 publications

(12 citation statements)

References 9 publications

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“…Dynamic loads: D90BT, out of phase; D0BT, in phase; DB, bending; DT, torsion. 9), (b) Ellyin energy parameter in Equation (11). Tests at kinematic load: K90BT, out of phase; K0BT, in phase; KB, bending; KT, torsion.…”

Section: Resultsmentioning

confidence: 99%

“…The fatigue properties of construction materials under uniaxial loads are best described in the literature [7][8][9]. However, due to the fact that in reality complex loading states occur in machines and structures, it is more desirable to test the complex state of loading complexity [10][11][12]. The issues that are currently raised in the literature regarding fatigue of materials are the analysis of the correlation between the material microstructure and fatigue life [13,14] as well as issues on the border of fracture mechanics and surface quality [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…Figure 15. (a) Glinka parameter in Equation (9), (b) Ellyin energy parameter in Equation(11). Tests at kinematic load: K90BT, out of phase; K0BT, in phase; KB, bending; KT, torsion.…”

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confidence: 99%

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Comparative Analysis of Fatigue Energy Characteristics of S355J2 Steel Subjected to Multi-Axis Loads

Lachowicz

Owsiński

2020

Materials

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In this study, a novel test system for estimating bending and torsion fatigue under selectable kinematic and dynamic loading modes was constructed. Using S355J2 steel specimens, a series of tests were conducted to determine material sensitivity to different load paths and loading modes. The experimental results were supplemented with the results of numerical analyses, on the basis of which the components of strain and stress tensors for subsequent analyses were determined in the entire working part of the specimen. An original method for determining specific strain energy components was used. The experimental results showed the grouping of data according to the mode of loading chosen. This could signify that the selected fatigue models are sensitive to certain loading scenarios. We performed in-depth data analysis and complex numerical simulations, formulating likely explanations for the observed effect.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative Analysis of Fatigue Energy Characteristics of S355J2 Steel Subjected to Multi-Axis Loads

Lachowicz

Owsiński

2020

Materials

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“…The fatigue limit is determined for a certain R = τ min /τ max asymmetry coefficient of the loading cycle. The options available are either specialized machines, built only for this purpose [ 2 , 3 , 4 , 5 ], or universal machines that also contain the torsion variant [ 6 , 7 , 8 , 9 ]. Devices used for torsional fatigue testing are, usually, independent, using actuators and sensors to determine the oscillatory motion [ 10 , 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Device for Torsional Fatigue Strength Assessment Adapted for Pulsating Testing Machines

Goanță

2022

Sensors

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The torsional fatigue test determines the fatigue limit for a certain asymmetry coefficient of the cycle. The assessment of fatigue tests is performed on specialized machines. There are two types of torsion testing machines: universal machines that have the torsion component and specialized machines only for torsion testing. Nevertheless, no matter which proposed option we choose, the purchase prices for these testing machines or the values spent for self-management are quite high. This paper presented a device used for torsion fatigue testing, adaptable to a universal pulsating testing machine, designed to determine the torsion fatigue limit for different materials. The built device is simple and reliable, and therefore inexpensive. By using this device, we can determine the limit of the torsional fatigue after any stress cycle and we can use the parameters obtained from the universal machine to which it was attached. The torque and twisting angle of the test specimen during the test can be determined by calculation. The paper also presented an experimental method for determining shear strains based on calibration experiment, using a specimen on which strain gauges were mounted. The values taken from this calibration experiment were compared with those obtained from the theoretical calculation.

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“…Analyses of fatigue strength or remaining service life of mechanical components that are subjected to cyclic loading are essential for safety and economic reasons [ 1 , 2 ]. Fatigue failures are caused by random, repetitive, or cyclic loads that are generally significantly lower than loadings that would lead to the plastic deformation of the material.…”

Section: Introductionmentioning

confidence: 99%

Using the Effect of Compression Stress in Fatigue Analysis of the Roller Bearing for Bimodal Stress Histories

2021

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A new approach based on the direct spectral method for fatigue analysis of elements subjected to bimodal stress histories, including high compression effects, is proposed. A correction factor, taking into account the influence of the mean compressive stresses, is used in the proposed method. Equivalent amplitude is estimated, based on criteria proposed by Smith, Watson, and Tooper, and by Bergmann and Seeger. The method is presented with example of a thrust roller bearing. Two cases in which the rollers were subjected to constant force 206 N (where constant amplitude stresses occurred in the rollers) and cyclic force (where bimodal stresses with variable amplitudes occurred in the rollers) are studied. It is observed that multiaxial fatigue criteria (Crossland, Papadopoulos) do not include the influence of bimodal stresses and should not be used for such loading conditions. The proposed method includes both kinds of stress waveforms in the fatigue analysis and can be applied for the accurate identification of stress components and the determination of fatigue life. The damage rate calculated by the proposed approach for rollers subjected to a cyclic force (equivalent load equal to 151 N) was 0.86, which is in good agreement with the recommendations provided in the literature. The obtained accuracy of the proposed method is above 95%.

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Bending and Torsion Fatigue-Testing Machine Developed for Multiaxial Non-Proportional Loading

Cited by 14 publications

References 9 publications

Comparative Analysis of Fatigue Energy Characteristics of S355J2 Steel Subjected to Multi-Axis Loads

Comparative Analysis of Fatigue Energy Characteristics of S355J2 Steel Subjected to Multi-Axis Loads

Device for Torsional Fatigue Strength Assessment Adapted for Pulsating Testing Machines

Using the Effect of Compression Stress in Fatigue Analysis of the Roller Bearing for Bimodal Stress Histories

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