The Experts below are selected from a list of 6579 Experts worldwide ranked by ideXlab platform
Luca Susmel - One of the best experts on this subject based on the ideXlab platform.
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Multiaxial Fatigue assessment of S355 steel in the high-cycle region by using Susmel’s criterion
Procedia Structural Integrity, 2020Co-Authors: Rita Dantas, Luca Susmel, Shun-peng Zhu, José A.f.o. Correia, Grzegorz Lesiuk, Dariusz Rozumek, Abílio De Jesus, Filippo BertoAbstract:Abstract Multiaxial Fatigue is frequently present on engineering structures and is the cause of many mechanical failures. However, Multiaxial Fatigue analysis is full of questions and different points of view. Thus, throughout this study, Susmel’s criterion, a recent Multiaxial Fatigue damage model also known as the Modified Wohler Curve Method, is presented, explained and assessed. Experimental data of axial, torsional and proportional (axial+torsional) Fatigue tests conducted on S355 structural steel and under different stress ratios were analysed and evaluated according to this model. Mean Fatigue design curves for each loading condition were obtained and plotted in the high cycle Fatigue region. Finally, the ability of Susmel’s criterion to assess the Multiaxial Fatigue behaviour of S355 steel in the high cycle region was evaluated by determining the error index between the theoretically estimated and the experimental Fatigue damage. Susmel’s model was found to be adequate to describe the Fatigue behaviour of the steel under study in high cycle region.
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A survey on Multiaxial Fatigue damage parameters under non‐proportional loadings
Fatigue & Fracture of Engineering Materials & Structures, 2017Co-Authors: Peng Luo, Luca Susmel, Weixing Yao, Yingyu Wang, Ma XiaoxiaoAbstract:In this paper, several Multiaxial Fatigue damage parameters taking into account non-proportional additional hardening are reviewed. According to the way non-proportional additional hardening is considered in the model, the damage parameters are classified into two categories: (i) equivalent damage parameters and (ii) direct damage parameters. The equivalent damage parameters usually define a non-proportional coefficient to consider non-proportional additional cyclic hardening, and make a combination of this non-proportional coefficient with stress and/or strain quantities to calculate the equivalent damage parameters. In contrast, the direct damage parameters are directly estimated from the stress and strain quantities of interest. The accuracy of four Multiaxial Fatigue damage parameters in predicting Fatigue lifetime is checked against about 150 groups of experimental data for 10 different metallic materials under Multiaxial Fatigue loading. The results revealed that both Itoh’s model, one of equivalent damage parameters, and Suemel’s model, which belong to direct damage parameters, could provide a better correlation with the experimental results than others assessed in this paper. So, direct damage parameters are not better than the equivalent damage parameters in predicting Fatigue lifetime.
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Special issue on ‘Multiaxial Fatigue 2013’: Selected papers from the 10th International Conference on Multiaxial Fatigue and Fracture (ICMFF10), held in Kyoto, Japan, on 3–6 June 2013
International Journal of Fatigue, 2014Co-Authors: Andrea Carpinteri, Thierry Palin-luc, Takamoto Itoh, Masao Sakane, Luca SusmelAbstract:This Special Issue of the International Journal of Fatigue contains selected papers presented at the International Conference on Multiaxial Fatigue and Fracture held in Kyoto, Japan, on 3–6 June 2013. The selected papers for this special issue cover a wide range of topics discussed at the Kyoto conference. These topics include the effects of the following factors on the Multiaxial Fatigue behaviour of materials and structures: geometrical stress concentrations, defects, weldments, high-cycle and low-cycle Fatigue loads, material microstructure, anisotropy, residual stresses, mean stresses, overloads, rolling contact, ratcheting, temperature, creep. The materials examined include metallic alloys and castings and composites. Practical considerations include methods of testing to determine service life under Multiaxial Fatigue loads. The selected papers have been revised and significantly extended by the authors and subjected to the normal IJF review process. Further selected papers from the conference are published in a Special Issue of Engineering Fracture Mechanics on ‘Multiaxial Fracture 2013'
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Multiaxial Fatigue of composite materials
Multiaxial Notch Fatigue, 2009Co-Authors: Luca SusmelAbstract:The present chapter attempts to systematically summarise the most relevant findings in this particular field of the structural integrity discipline to single out those parameters playing a primary role in the overall Fatigue behaviour of composites subjected to complex loading paths as well as to check the accuracy of the available Multiaxial Fatigue criteria.
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a stress based method to predict lifetime under Multiaxial Fatigue loadings
Fatigue & Fracture of Engineering Materials & Structures, 2003Co-Authors: Paolo Lazzarin, Luca SusmelAbstract:This paper extends to low/medium-cycle Fatigue a stress-based method recently proposed by the same authors for high-cycle Multiaxial Fatigue assessments. By considering the plane of maximum shear stress amplitude coincident with the microcrack initiation plane, the method requires the calculation both of the maximum shear stress amplitude and the maximum normal stress relative to the same plane. Multiaxial Fatigue life estimates are made by means of bi-parametric modified Wohler curves, which take into account the mean stress effect, the influence of the out-of-phase angle and the presence of notches by using a generalization to Multiaxial Fatigue of the Fatigue strength reduction factor K f . Approximately 700 experimental data taken from the literature are used to demonstrate that the method is a useful tool to summarize Fatigue strength data of both smooth and notched components, subjected to either in-phase or out-of-phase loads. Finally, a simple practical rule for the calculation of the Multiaxial Fatigue strength reduction factor is proposed.
Tianjia Liu - One of the best experts on this subject based on the ideXlab platform.
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assessment approach for Multiaxial Fatigue damage of deck and u rib weld in steel bridge decks
Construction and Building Materials, 2018Co-Authors: Yixun Wang, Tianjia LiuAbstract:Abstract Assessment approach for Multiaxial Fatigue damage of deck and U-rib weld in steel bridge decks was studied. The orthotropic steel bridge deck was modelled to analyse the Multiaxial stress state of the weld under wheel load. A Multiaxial Fatigue loading experiment was carried out to assess the Fatigue strength of deck and U-rib weld based on equivalent stress and maximum principal stress. The critical plane approach which is suitable for deck-U rib welds was also established. The assessment results were then compared to those obtained by uniaxial Fatigue approach. Reasonable Multiaxial Fatigue principles were proposed for deck and U-rib welds in different positions. The results show that Multiaxial Fatigue stress is observed in the deck-U rib weld. The shear stress may exceed normal stress and become the main reason for Fatigue damage, thus a Multiaxial Fatigue approach is necessary for Fatigue damage assessment. The nominal stress approach is suggested for Fatigue assessment of deck and U-rib weld between diaphragms, which leads to conservative results and is more applicable to engineering practice. The critical plane approach is suggested for Fatigue assessment of deck and U-rib weld on the diaphragm considering Multiaxial Fatigue effects and non-proportional stress in the weld.
Sankaran Mahadevan - One of the best experts on this subject based on the ideXlab platform.
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a unified Multiaxial Fatigue damage model for isotropic and anisotropic materials
International Journal of Fatigue, 2007Co-Authors: Sankaran MahadevanAbstract:A unified Multiaxial Fatigue damage model based on a characteristic plane approach is proposed in this paper, integrating both isotropic and anisotropic materials into one framework. Compared with most available critical plane-based models for Multiaxial Fatigue problem, the physical basis of the characteristic plane does not rely on the observations of the Fatigue crack in the proposed model. The cracking information is not required for Multiaxial Fatigue analysis and the proposed model can automatically adapt for very different materials experiencing different failure modes. The effect of the mean normal stress is also included in the proposed model. The results of the proposed Fatigue life prediction model are validated using experimental results of metals as well as unidirectional and multidirectional composite laminates.
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Strain-based Multiaxial Fatigue damage modelling
Fatigue Fracture of Engineering Materials and Structures, 2005Co-Authors: Yongming Liu, Sankaran MahadevanAbstract:A new Multiaxial Fatigue damage model named characteristic plane approach is proposed in this paper, in which the strain components are used to correlate with the Fatigue damage. The characteristic plane is defined as a material plane on which the complex three-dimensional (3D) Fatigue problem can be approximated using the plane strain components. Compared with most available critical plane-based models for Multiaxial Fatigue problem, the physical basis of the characteristic plane does not rely on the observations of the Fatigue crack in the proposed model. The cracking information is not required for Multiaxial Fatigue analysis, and the proposed model can automatically adapt for different failure modes, such as shear or tensile-dominated failure. Mean stress effect is also included in the proposed model by a correction factor. The life predictions of the proposed Fatigue damage model under constant amplitude loading are compared with a wide range of metal Fatigue results in the literature.
Hong Chen - One of the best experts on this subject based on the ideXlab platform.
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Comparison of Multiaxial Fatigue damage models under variable amplitude loading
Journal of Mechanical Science and Technology, 2012Co-Authors: Hong Chen, D.-g. Shang, Yu-jie Tian, Jian-zhong LiuAbstract:Based on the cycle counting method of Wang and Brown and on the linear accumulation damage rule of Miner, four Multiaxial Fatigue damage models without any weight factors proposed by Pan et al., Varvani-Farahani, Shang and Wang, and Shang et al. are used to compute Fatigue damage. The procedure is evaluated using the low cycle Fatigue experimental data of 7050-T7451 aluminum alloy and En15R steel under tension/torsion variable amplitude loading. The results reveal that the procedure is convenient for engineering design and application, and that the four Multiaxial Fatigue damage models provide good life estimates.
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Selection of Multiaxial Fatigue damage model based on the dominated loading modes
International Journal of Fatigue, 2011Co-Authors: Hong ChenAbstract:Abstract Based on the strain-based Multiaxial Fatigue models, a method was proposed to calculate Multiaxial Fatigue damage. If the calculated Fatigue damage by the shear strain parameter is less than that by the axial strain parameter, an axial strain-based Multiaxial Fatigue model was used to calculate Fatigue damage, or else a shear strain-based Multiaxial Fatigue model was used to calculate Fatigue damage. The proposed Multiaxial Fatigue damage calculation method was verified by some experimental data under tension–torsion constant amplitude loading. The results showed that a good agreement is demonstrated with experimental data.
Yixun Wang - One of the best experts on this subject based on the ideXlab platform.
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effects of Multiaxial Fatigue on typical details of orthotropic steel bridge deck
Thin-walled Structures, 2019Co-Authors: Zhongqiu Fu, Yixun Wang, Bohai Ji, Fei JiangAbstract:Abstract Effects of Multiaxial Fatigue on typical details of orthotropic steel bridge deck were studied. The calculating limit of Fatigue damage considering Multiaxial stress was investigated. The maximum principal stress with the greatest absolute value was first proposed to judge the stress state of certain details. The Fatigue details in the steel bridge deck were then classified based on structural characteristics. The influence of Multiaxial Fatigue on the stress state and cracking direction was also analyzed. The Multiaxial Fatigue deviation was introduced to determine the calculating limit which was verified by the Multiaxial Fatigue experiment of the deck and U-rib weld. The results show Fatigue details in the steel bridge are usually in a state of Multiaxial stress, and uniaxial stress is only an instantaneous state when the centerline of the wheel load coincides with that of the symmetrical details. The direction of crack growth is mainly determined by Multiaxial stress and structural characteristics. If a precision of 90% is achieved, the uniaxial Fatigue theory can be applied to assess the Multiaxial Fatigue damage when δ is smaller than 1.06413.
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assessment approach for Multiaxial Fatigue damage of deck and u rib weld in steel bridge decks
Construction and Building Materials, 2018Co-Authors: Yixun Wang, Tianjia LiuAbstract:Abstract Assessment approach for Multiaxial Fatigue damage of deck and U-rib weld in steel bridge decks was studied. The orthotropic steel bridge deck was modelled to analyse the Multiaxial stress state of the weld under wheel load. A Multiaxial Fatigue loading experiment was carried out to assess the Fatigue strength of deck and U-rib weld based on equivalent stress and maximum principal stress. The critical plane approach which is suitable for deck-U rib welds was also established. The assessment results were then compared to those obtained by uniaxial Fatigue approach. Reasonable Multiaxial Fatigue principles were proposed for deck and U-rib welds in different positions. The results show that Multiaxial Fatigue stress is observed in the deck-U rib weld. The shear stress may exceed normal stress and become the main reason for Fatigue damage, thus a Multiaxial Fatigue approach is necessary for Fatigue damage assessment. The nominal stress approach is suggested for Fatigue assessment of deck and U-rib weld between diaphragms, which leads to conservative results and is more applicable to engineering practice. The critical plane approach is suggested for Fatigue assessment of deck and U-rib weld on the diaphragm considering Multiaxial Fatigue effects and non-proportional stress in the weld.
