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Deguang Shang - One of the best experts on this subject based on the ideXlab platform.
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equivalent energy based critical plane Fatigue Damage Parameter for multiaxial lcf under variable amplitude loading
International Journal of Fatigue, 2020Co-Authors: Long Xue, Deguang Shang, Xiaodong Liu, Hong ChenAbstract:Abstract Combining the concept of energy on the critical plane, a multiaxial Fatigue Damage Parameter without any weight coefficient was proposed and the effects of non-proportional additional hardening and mean stress on Fatigue Damage can be reflected more perfectly using an equivalent form of shear strain energy. Furthermore, two sets of experimental data are employed to verify the proposed method, and the sensitiveness to Fatigue life of the proposed equivalent stress correction factor is discussed as well. The results show that satisfactory and conservative assessments can be obtained by the proposed method, especially under multiaxial irregular loading with great randomness.
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Fatigue life prediction under variable amplitude axial torsion loading using maximum Damage Parameter range method
International Journal of Pressure Vessels and Piping, 2013Co-Authors: Hong Chen, Deguang Shang, Yujie Tian, Jianzhong LiuAbstract:Abstract This article deals with the problem of multiaxial Fatigue life assessment under variable amplitude axial–torsion loading. A maximum Damage Parameter range (MDPR) reversal counting method is proposed to predict Fatigue life under variable amplitude multiaxial loading. First, a multiaxial Fatigue Damage Parameter is selected for a given multiaxial loading time history. Then, a Damage Parameter range time history can be calculated. Finally, based on the MDPR method, Fatigue life can be predicted by correlating with multiaxial Fatigue Damage model and the Miner–Palmgren Damage rule. The proposed method is evaluated with experimental data of the 7050-T7451 aluminum alloy and En15R steel under variable amplitude multiaxial loading. The results demonstrated that the proposed method can provide satisfactory prediction.
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prediction of Fatigue lifetime under multiaxial cyclic loading using finite element analysis
Materials & Design, 2010Co-Authors: Deguang ShangAbstract:Abstract Life prediction for GH4169 superalloy thin tubular and notched specimens were investigated under proportional and nonproportional loading with elastic–plastic finite element analysis (FEA). A strain-controlled tension–torsion loading was carried out by applying the axial and circular displacements on one end of the specimen in the cylindrical coordinate system. Uniaxial cyclic stress–strain data at high temperature were used to describe the multi-linear kinematic hardening of the material. The comparison between FEA and experimental results for thin tubular specimen showed that the built model of FE is reliable. A Fatigue Damage Parameter was proposed to predict the Fatigue crack initiation life for notched specimen. The results showed that a good agreement was achieved with experimental data.
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multiaxial Fatigue Damage Parameter and life prediction for medium carbon steel based on the critical plane approach
International Journal of Fatigue, 2007Co-Authors: Deguang Shang, Jing DengAbstract:Abstract The tension–torsion Fatigue characteristics were investigated under proportional and non-proportional loading in this paper. The Fatigue cracks on the surface of multiaxial Fatigue specimens were observed and analyzed by a scan electron microscope. On the basis of the investigation on the Kindil–Brown–Miller and Fatemi–Socie’s critical plane approaches, a shear strain based multiaxial Fatigue Damage Parameter was proposed by von Mises criterion based on combining the maximum shear strain and the normal strain excursion between adjacent turning points of the maximum shear strain on the critical plane. The proposed multiaxial Fatigue Damage Parameter does not include the weight constants. According to the proposed multiaxial Fatigue Damage Parameter, the multiaxial Fatigue life prediction model was established with the Coffin–Manson equation, which is used to predict the multiaxial Fatigue life of medium-carbon steel. The results showed that the proposed multiaxial Fatigue Damage Parameter could be used under either multiaxial proportional or non-proportional loading.
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creep Fatigue life prediction under fully reversed multiaxial loading at high temperatures
International Journal of Fatigue, 2007Co-Authors: Deguang Shang, Guoqin Sun, Chuliang Yan, Jianhua Chen, Neng CaiAbstract:Abstract A multiaxial Fatigue Damage Parameter based on the critical plane approach was proposed to calculate the pure Fatigue Damage under uniaxial/multiaxial loading at constant high temperatures. For the fully-reversed low-cycle Fatigue loading under low frequency at high temperature, one-half of the maximum equivalent stress response value at cyclic stabilization is used as the creep stress to evaluate the multiaxial creep Damage. The linear Damage accumulation rule is used to predict the multiaxial creep-Fatigue life at high temperature. The creep-Fatigue experimental data of thin tubular specimens with GH4169 superalloy and 2.25Cr–1Mo steel were used to verify the proposed creep-Fatigue life prediction model. The results showed that the proposed creep-Fatigue Damage calculation model can be used under either uniaxial or multiaxial nonproportional loading at high temperature. The proposed model is used to predict multiaxial creep-Fatigue life, and a good agreement is demonstrated with experimental data.
M. Panbechi - One of the best experts on this subject based on the ideXlab platform.
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An energy-based Fatigue Damage Parameter for off-axis unidirectional FRP composites
Composite Structures, 2007Co-Authors: A. Varvani-farahani, H. Haftchenari, M. PanbechiAbstract:Abstract An energy-based Fatigue Damage Parameter has been developed to assess the Fatigue Damage of unidirectional glass-reinforced plastic (GRP) and carbon-fiber reinforced plastic (CFRP) composites. The proposed Parameter is based on the physics and the mechanism of Fatigue cracking within three Damage regions of matrix (I), fiber–matrix interface (II), and fiber (III) in these materials as the number of cycles progresses. The Parameter involves the shear and normal energies calculated from stress and strain components acting on these region. In region I the Damage was initiated in the form of microcracks within the matrix. For region II, the Damage progress took place along the matrix–fiber interface leading to fiber fracture in region III. The proposed Fatigue Damage model successfully correlated Fatigue lives of unidirectional GRP and CFRP composites at various off-axis angles θ and stress ratios R. The results of Fatigue Damage assessment revealed that the proposed Damage Parameter correlated Fatigue data with a higher degree of success as compared with Fatigue Damage Parameters developed earlier.
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a Fatigue Damage Parameter for life assessment of off axis unidirectional grp composites
Journal of Composite Materials, 2006Co-Authors: A Varvanifarahani, H. Haftchenari, M. PanbechiAbstract:The present study develops a Fatigue Damage Parameter to assess the Fatigue Damage of unidirectional glass fiber reinforced plastic (GRP) composites. The proposed Parameter is based on the physics and the mechanism of Fatigue cracking within three Damage regions of matrix (I), fiber-matrix interface (II), and fiber (III) in these materials as the number of cycles progresses. In region I, Damage was initiated in the form of microcracks within the matrix. For region II, Damage progress took place along the matrix-fiber interface leading to fiber fracture in region III. The proposed Fatigue Damage model successfully correlated Fatigue lives of unidirectional GRP composites at various off-axis angles and stress ratios R as compared with other earlier developed Fatigue Parameters.
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a Fatigue Damage Parameter for life assessment of off axis unidirectional grp composites
Journal of Composite Materials, 2006Co-Authors: A Varvanifarahani, H. Haftchenari, M. PanbechiAbstract:The present study develops a Fatigue Damage Parameter to assess the Fatigue Damage of unidirectional glass fiber reinforced plastic (GRP) composites. The proposed Parameter is based on the physics ...
Grzegorz Glinka - One of the best experts on this subject based on the ideXlab platform.
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Innovative computational modeling of multiaxial Fatigue analysis for notched components
International Journal of Fatigue, 2016Co-Authors: Ayhan Ince, Grzegorz GlinkaAbstract:Abstract Most of the notched components for ground vehicles experience complex multiaxial loadings, where principal stresses rotate and change non-proportionally their magnitudes during a loading cycle. Furthermore, many vehicle components contain notches and geometrical irregularities because of design requirements. These geometric discontinuities cause significant stress concentrations. Multiaxial loads result in complex stress and strain responses at notch areas and can induce a Fatigue failure even without any warning of noticeable plastic deformation. Unfortunately, the combination of multiaxial loading paths and complex geometries of mechanical components is unavoidable in practice and experiments performing durability test for ground vehicles are often not feasible because of time and cost considerations. Therefore, an innovative computational Fatigue analysis methodology has been proposed here for multiaxial Fatigue life analysis of notched components under design process using analytical and numerical methods. The proposed multiaxial Fatigue analysis methodology consists of an elastic–plastic stress–strain model and a multiaxial Fatigue Damage Parameter. Computed results of the proposed methodology are compared to sets of experimental published data to verify the prediction capability of the elastic–plastic stress–strain model and the Fatigue Damage Parameter. A comparison of analysis results and experimental data shows that the multiaxial elastic–plastic stress–strain model correlates well with experimental strain data for SAE 1070 steel notched bars subjected to complex non-proportional load paths. The proposed Fatigue Damage Parameter correlates well with Fatigue data of 1045 steel and Inconel 718 tubular specimens under proportional and non-proportional loadings. Finally the complete analysis methodology incorporating both the elastic–plastic stress–strain model and the multiaxial Fatigue Damage Parameter is found to be in a good agreement with experimental data of SAE 1045 steel notched shafts subjected to proportional and non-proportional loadings.
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A generalized Fatigue Damage Parameter for multiaxial Fatigue life prediction under proportional and non-proportional loadings
International Journal of Fatigue, 2014Co-Authors: Ayhan Ince, Grzegorz GlinkaAbstract:Abstract In this paper, two different forms of an original multiaxial Fatigue Damage Parameter related to the maximum Fatigue Damage plane are proposed for performing Fatigue life prediction under various loading conditions loadings. The proposed Fatigue Damage Parameters have been applied to uniaxial and multiaxial loading conditions for geometrically different bodies. Both the Damage Parameters are correlated to sets of experimental data published in the literature to verify the prediction accuracy of the Damage Parameters. The Damage Parameter in the form of the GSA, when applied to the uniaxial loading, provides very good correlations with four sets of experimental mean stress Fatigue data for Incoloy 901 super alloy, ASTM A723 steel, 7075-T561 aluminum alloy and 1045 HRC 55 steel. In the case of multiaxial loadings, both the GSE and GSA Parameters are found to correlate well with Fatigue data of 1045 steel and Inconel 718 tubular specimens under proportional and non-proportional loadings. In addition, the Damage Parameters show reasonably acceptable correlations with experimental Fatigue data of SAE 1045 steel notched shafts subjected to proportional and non-proportional loadings.
Pingsha Dong - One of the best experts on this subject based on the ideXlab platform.
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an equivalent stress Parameter for multi axial Fatigue evaluation of welded components including non proportional loading effects
International Journal of Fatigue, 2017Co-Authors: Jifa Mei, Pingsha DongAbstract:Abstract This paper presents a comprehensive investigation into non-proportional multi-axial Fatigue of welded components by introducing an equivalent structural stress Parameter that takes into account of load-path non-proportionality in addition to plate thickness and stress state effects. This is accomplished by formulating a “moment of load path” or “MLP” based Fatigue Damage Parameter that provides a consistent treatment of load-path non-proportionality under arbitrary multi-axial loading conditions for which cycle counting can be consistently performed by means of a previously developed path-dependent maximum range (PDMR) cycle counting procedure. To examine its broad applicability and effectiveness, non-proportional multi-axial test data obtained using different components, joint types, and loading conditions from various sources are analyzed using the newly developed equivalent stress Parameter. The results show that the new equivalent stress Parameter enables not only an effective consolidation of all multi-axial test data (up to about 300 tests) analyzed in this paper into a narrow band, but also the demonstrated transferability between the master S-N curve (dominated by test data under uniaxial cyclic loading conditions) adopted by the 2007 ASME Div 2 and API 579 RP/ASME FFS-1 Codes and the consolidated S-N curve dominated by severe non-proportional multi-axial cyclic loading conditions. As a result of the present development, a unified Fatigue evaluation procedure based on the newly proposed effective stress Parameter and a single master S-N curve can be implemented for arbitrary cyclic loading conditions regardless of stress multi-axiality or load path proportionality.
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a new path dependent Fatigue Damage model for non proportional multi axial loading
International Journal of Fatigue, 2016Co-Authors: Pingsha DongAbstract:Abstract This paper presents a new path-dependent multi-axial Fatigue Damage model which is formulated based on an incremental form of Moment of Load Path (MLP) on either σ - β τ stress plane or e - β e γ strain plane. The resulting MLP-based Fatigue Damage Parameter can be shown to be related to an integral form of strain energy densities contributed by normal and shear deformation and each weighted by a path-dependent function. Then, the MLP-based Damage Parameter in terms of either equivalent stress range or strain range, in conjunction with path-dependent maximum-range cycle counting procedure (Dong et al., 2010; Wei and Dong, 2010), has been shown effective in correlating a large amount of test data obtained under non-proportional multi-axial loading conditions both for welded joints under stress-controlled conditions in high cycle Fatigue regime and non-welded components under strain-controlled conditions in low-cycle regime.
Jing Deng - One of the best experts on this subject based on the ideXlab platform.
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multiaxial Fatigue Damage Parameter and life prediction for medium carbon steel based on the critical plane approach
International Journal of Fatigue, 2007Co-Authors: Deguang Shang, Jing DengAbstract:Abstract The tension–torsion Fatigue characteristics were investigated under proportional and non-proportional loading in this paper. The Fatigue cracks on the surface of multiaxial Fatigue specimens were observed and analyzed by a scan electron microscope. On the basis of the investigation on the Kindil–Brown–Miller and Fatemi–Socie’s critical plane approaches, a shear strain based multiaxial Fatigue Damage Parameter was proposed by von Mises criterion based on combining the maximum shear strain and the normal strain excursion between adjacent turning points of the maximum shear strain on the critical plane. The proposed multiaxial Fatigue Damage Parameter does not include the weight constants. According to the proposed multiaxial Fatigue Damage Parameter, the multiaxial Fatigue life prediction model was established with the Coffin–Manson equation, which is used to predict the multiaxial Fatigue life of medium-carbon steel. The results showed that the proposed multiaxial Fatigue Damage Parameter could be used under either multiaxial proportional or non-proportional loading.
