Smith Watson and Topper Model in the Determination of the Fatigue Life of an Automotive Steel

Curiel, F.F.; Ambriz, R.R.; García, M. A.; Ramirez, M Cadengo; Garcia, Sérgio Boscato

doi:10.1007/978-3-319-70365-7_23

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…It is now most commonly used in the analysis of proportional and non-proportional loadings. The Smith Watson and Topper parameter is a model based on material caused damage and inherent properties determined from LCF tests [ 41 ]. The same coefficient was used for the experimental measurements.…”

Section: Discussionmentioning

confidence: 99%

Experimental Research on Manson–Coffin Curves for the Frame Material of an Unconventional Vehicle

et al. 2022

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The submitted research paper describes the fundamental findings in terms of multiaxial fatigue of the basic material EN AW6063 and its welds for implementation in the frame design of an unconventional vehicle. It also includes a briefly-presented conceptual design of a technical solution for optimizing the functionality of a steering mechanism in a patented unconventional vehicle, designed by the authors to increase the cornering stability of a vehicle–tricycle. The most important part of this article is the description of the ongoing research and the results of multiaxial fatigue (bending–torsion combination) of the structural material for the construction of the vehicle frame. The research in this area is important due to the increased load on the frame during operation caused by the unconventional steering mechanism. The measured and constructed Manson–Coffin curves indicate that the use of material EN AW6063 is possible for this vehicle in terms of multiaxial stress. This also applies to the material affected by the technology in the frame production (TIG welding). A higher fatigue of the basic material was observed at a 90° phase shift. The difference between the 0° and 90° phases practically makes up approximately 10 to 15% of the difference in the cycle numbers with the same deformation amplitude. At the same time, the measured results show that the phase shift between loads will not play such an important role in welded joints of aluminum alloy EN AW6063. When comparing the dependences with a constant deformation amplitude in bending and in torsion, it can be said that the bending stress will react more to even a small change in the deformation amplitude. Bending has been proven to be the more dominant component of the total deformation amplitude in multiaxial tests. In terms of low-cycle multiaxial fatigue (up to 5 × 105 cycles), a higher fatigue of the basic material is found in comparison with the weld. At lower deformation amplitudes, a higher fatigue of the welded material is detected.

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Section: Discussionmentioning

confidence: 99%

Experimental Research on Manson–Coffin Curves for the Frame Material of an Unconventional Vehicle

et al. 2022

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“…Constant research is also being conducted on the group of damage measures other than the damage degree, for example, evaluations on the plane of maximum normal or shear strains, such as the Smith–Watson–Topper (e.g., Reference [ 16 ]) and Fatemi–Socie [ 17 ] parameters. Both of them utilize the Coffin–Manson equation as the fatigue curve.…”

Section: Relation Between Fatigue Damage Accumulation and Fatigue Lifementioning

confidence: 99%

Non-Linear Probabilistic Modification of Miner’s Rule for Damage Accumulation

Blacha

2021

Materials

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A non-linear modification to Miner’s rule for damage accumulation is proposed to reduce the scatter between experimental fatigue life and fatigue life predicted according to the original Miner’s sum. Based on P-s-n probability distribution and design s-n curves, the modification satisfies the assumption of equality between the mean damage degree (at the critical level) and fatigue life random variables, which is not covered in the original formulation. The adopted formulation shows the discrepancies between the fatigue lives predicted according to the design s-n curves and the estimated probability distribution. It also proves that it is inappropriate to apply a normal distribution to fatigue life analysis and that the model becomes non-linear only for non-normal distributions. The predictions according to the established model were compared to the predictions obtained with Miner’s rule.

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“…In the automotive industry, components are designated to be replaced because they are considered as fail when a crack is initiated [31]. Hence, strain life approach is suitable for automotive applications, especially for steel-made components [32]. The Coffin-Manson strain life relationship can be mathematically defined as follows:…”

Section: Fatigue Life Assessmentmentioning

confidence: 99%

Evaluation of Energy-Based Model Generated Strain Signals for Carbon Steel Spring Fatigue Life Assessment

Kong

Abdullah

Schramm

et al. 2019

Metals

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This paper presents the evaluation of the automobile coil-spring strain-displacement relationship for strain signals generation and fatigue life predictions. The development of a strain and spring vertical displacement relationship is significant because measuring vehicle wheel displacements and forces are complex and costly. Hence, there is a need to estimate the strain data using alternative measurement, such as vibration signals. In this analysis, strain and acceleration data were collected from a vehicle that has travelled on different road conditions. Through the material elastic strain energy and spring potential energy relationship, a coil-spring parameterise strain-displacement relationship has been developed and evaluated using a scatter band and correlation approach. Using this proposed model, the strain time histories were obtained based on acceleration data. For fatigue life analysis, most of the predicted fatigue life was distributed in the acceptable range using the scatter band approach where the data correlated at coefficient of determination value (R2) of 0.8788. With a suitable correlation value, this analysis proposed an alternative strain generation method for suspension coil spring fatigue life prediction, which could significantly shorten the spring development time.

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Smith Watson and Topper Model in the Determination of the Fatigue Life of an Automotive Steel

Cited by 8 publications

References 7 publications

Experimental Research on Manson–Coffin Curves for the Frame Material of an Unconventional Vehicle

Experimental Research on Manson–Coffin Curves for the Frame Material of an Unconventional Vehicle

Non-Linear Probabilistic Modification of Miner’s Rule for Damage Accumulation

Evaluation of Energy-Based Model Generated Strain Signals for Carbon Steel Spring Fatigue Life Assessment

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