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Hongzhong Huang - One of the best experts on this subject based on the ideXlab platform.
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Probabilistic Modeling of Damage Accumulation for Fatigue Reliability Analysis
Procedia structural integrity, 2017Co-Authors: Hongzhong HuangAbstract:Abstract For high-speed trains, reliability prediction of railway axles plays an important role in preventing accidents due to fatigue. Using a nonlinear Damage Accumulation concept, a probabilistic S-N curve and one-to-one probability density function transformation, a probabilistic approach for modeling Damage Accumulation is developed to analyze the fatigue reliability of railway axle steels. Through characterizing the Damage Accumulation process as a distribution of degradation path, the proposed method captures a nonlinear Damage Accumulation phenomenon under variable amplitude loadings. The fatigue reliability is then analyzed and demonstrated through probabilistic modeling of cumulative Damage, and an agreement between the predicted results and the experimental measurements under different loading conditions is obtained.
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a modified nonlinear fatigue Damage Accumulation model
International Journal of Damage Mechanics, 2015Co-Authors: Zhiqiang Lv, Hongzhong HuangAbstract:This paper presents a modified nonlinear fatigue Damage Accumulation model accounting for load interaction effects. The original model is based on physical property degradation of materials, from w...
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A nonlinear fatigue Damage Accumulation model considering strength degradation and its applications to fatigue reliability analysis
International Journal of Damage Mechanics, 2014Co-Authors: Rong Yuan, Haiqing Li, Hongzhong HuangAbstract:Fatigue is a Damage Accumulation process in which the material property deteriorates and degenerates continuously under cyclic loading. The analysis of Damage Accumulation plays a key role in preve...
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a modified nonlinear Damage Accumulation model for fatigue life prediction considering load interaction effects
The Scientific World Journal, 2014Co-Authors: Hongzhong Huang, Yanfeng Li, Rong YuanAbstract:Many structures are subjected to variable amplitude loading in engineering practice. The foundation of fatigue life prediction under variable amplitude loading is how to deal with the fatigue Damage Accumulation. A nonlinear fatigue Damage Accumulation model to consider the effects of load sequences was proposed in earlier literature, but the model cannot consider the load interaction effects, and sometimes it makes a major error. A modified nonlinear Damage Accumulation model is proposed in this paper to account for the load interaction effects. Experimental data of two metallic materials are used to validate the proposed model. The agreement between the model prediction and experimental data is observed, and the predictions by proposed model are more possibly in accordance with experimental data than that by primary model and Miner’s rule. Comparison between the predicted cumulative Damage by the proposed model and an existing model shows that the proposed model predictions can meet the accuracy requirement of the engineering project and it can be used to predict the fatigue life of welded aluminum alloy joint of Electric Multiple Units (EMU); meanwhile, the accuracy of approximation can be obtained from the proposed model though more simple computing process and less material parameters calling for extensive testing than the existing model.
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A study on fatigue Damage Accumulation based on continuum Damage mechanics
2012 International Conference on Quality Reliability Risk Maintenance and Safety Engineering, 2012Co-Authors: Zhean Gong, Yong Tang, Hongzhong HuangAbstract:On the basis of the continuum Damage mechanics, a new low cycle fatigue Damage Accumulation model, which takes the coupling effect of Damage and strain into account, is proposed. The model has some practical values because of its clear physical meanings. With the analysis of low-cycle test data for a kind of material often used in aero engine, we know that the prediction data derived from this new model and the test data are in good agreement. Moreover, this new model is more accurate and has apparent superiority in fatigue life prediction and description of fatigue Damage Accumulation by comparing with the traditional linear model.
Dimitrios G. Pavlou - One of the best experts on this subject based on the ideXlab platform.
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Derivation of fatigue Damage Accumulation curves based on changes in composite material properties
2020Co-Authors: Dimitrios G. Pavlou, Kyriakos I. KourousisAbstract:The life of composite materials (CM) subjected to fatigue conditions is associated with the gradual Damage of their structure. Since the Damage Accumulation is reflected by changes in CM properties, the derivation of Damage Accumulation curves may be based on test results providing the reduction of the residual strength. Examined in this work is a non-linear fatigue Damage Accumulation function for cross-ply CF/PEEK laminates. This Damage function is specified with respect to Damage parameters derived by the strength decrease during fatigue for the CF/PEEK. Taking into account this concept, an improvement of the theory of isoDamage lines is proposed. Since the nonlinearity of the derived Damage function depends on an exponent that is a function of the fatigue stress amplitude, the effect of the loading order and the previous Damage history on the total fatigue life is investigated. Numerical examples of fatigue life prediction under two-stage loading conditions and a Damage Accumulation map for the CP/PEEK are presented and discussed.
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a one parameter nonlinear fatigue Damage Accumulation model
International Journal of Fatigue, 2017Co-Authors: Kristen Rege, Dimitrios G. PavlouAbstract:Abstract A nonlinear model for fatigue Damage Accumulation under variable amplitude loading is presented. The known assumption that the isoDamage curves are converging at the knee point of the S-N curve of the material, has been adopted. The proposed model does only require one parameter, in addition to the S-N curve of the material, in order to calculate the remaining fatigue life. A single value for the parameter has been found to give satisfying agreement with experimental data for four arbitrary selected steels, indicating a general trend.
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A Phenomenological Approach for Fatigue Damage Accumulation of CF/PEEK Laminates Under Two-Stage Loading
International Review of Mechanical Engineering-IREME, 2013Co-Authors: Dimitrios G. Pavlou, Kyriakos I. KourousisAbstract:The life of composite materials (CM) subjected to fatigue conditions is associated with the gradual Damage of their structure. Since the Damage Accumulation is reflected by changes in CM properties, the derivation of Damage Accumulation curves may be based on test results providing the reduction of the residual strength. Examined in this work is a non-linear fatigue Damage Accumulation function for cross-ply CF/PEEK laminates. This Damage function is specified with respect to Damage parameters derived by the strength decrease during fatigue for the CF/PEEK. Taking into account this concept, an improvement of the theory of isoDamage lines is proposed. Since the nonlinearity of the derived Damage function depends on an exponent that is a function of the fatigue stress amplitude, the effect of the loading order and the previous Damage history on the total fatigue life is investigated. Numerical examples of fatigue life prediction under two-stage loading conditions and a Damage Accumulation map for the CP/PEEK are presented and discussed.
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Creep Damage Accumulation Under Multi-Stage Loading
WIT transactions on engineering sciences, 2000Co-Authors: Dimitrios G. PavlouAbstract:In this paper the problem of cumulative creep Damage is considered. A general non-linear creep Damage Accumulation model, suitable for variable loading and/or temperature, is presented. The proposed Damage Accumulation function takes into account the previous Damage history as well as the loading order effect. This Damage function is specified with respect to Damage parameters derived by the stress versus Larson-Miller parameter curve. It is shown that some of the existing models can be obtained as a particular case of the model developed here in. Theoretical results are correlated well with experimental data for austenitic steel X-8-CrNiMoNb-16-16 at 700 °C subjected to a square block loading.
Caglar Oskay - One of the best experts on this subject based on the ideXlab platform.
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Experimental and computational investigation of progressive Damage Accumulation in CFRP composites
Composites Part B-engineering, 2013Co-Authors: Robert D. Crouch, Stephen B. Clay, Caglar OskayAbstract:Abstract This manuscript presents an experimental and computational study of progressive Damage Accumulation in carbon fiber reinforced polymers. A series of monotonic tension experiments with acoustic emission, X-ray radiography, and X-ray computed tomography were performed on a quasi-isotropic layup to ascertain the initiation, progression, and modes of Damage Accumulation under tensile loading. A multiscale computational model was used to aid in understanding the progressive Damage Accumulation. The eigendeformation based reduced order homogenization modeling approach was used due to its computational efficiency and its ability to incorporate distinct Damage modes. The combined experimental and computational investigation provided a detailed picture of the progression of Damage Accumulation in the CFRP composite. The multiscale model predictions were in good agreement with experimental observations.
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Experimental and computational investigation of progressive Damage Accumulation in CFRP composites
Composites Part B: Engineering, 2013Co-Authors: Robert D. Crouch, Stephen B. Clay, Caglar OskayAbstract:This manuscript presents an experimental and computational study of progressive Damage Accumulation in carbon fiber reinforced polymers. A series of monotonic tension experiments with acoustic emission, X-ray radiography, and X-ray computed tomography were performed on a quasi-isotropic layup to ascertain the initiation, progression, and modes of Damage Accumulation under tensile loading. A multiscale computational model was used to aid in understanding the progressive Damage Accumulation. The eigendeformation based reduced order homogenization modeling approach was used due to its computational efficiency and its ability to incorporate distinct Damage modes. The combined experimental and computational investigation provided a detailed picture of the progression of Damage Accumulation in the CFRP composite. The multiscale model predictions were in good agreement with experimental observations. © 2013 Elsevier Ltd. All rights reserved.
Robert D. Crouch - One of the best experts on this subject based on the ideXlab platform.
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Experimental and computational investigation of progressive Damage Accumulation in CFRP composites
Composites Part B-engineering, 2013Co-Authors: Robert D. Crouch, Stephen B. Clay, Caglar OskayAbstract:Abstract This manuscript presents an experimental and computational study of progressive Damage Accumulation in carbon fiber reinforced polymers. A series of monotonic tension experiments with acoustic emission, X-ray radiography, and X-ray computed tomography were performed on a quasi-isotropic layup to ascertain the initiation, progression, and modes of Damage Accumulation under tensile loading. A multiscale computational model was used to aid in understanding the progressive Damage Accumulation. The eigendeformation based reduced order homogenization modeling approach was used due to its computational efficiency and its ability to incorporate distinct Damage modes. The combined experimental and computational investigation provided a detailed picture of the progression of Damage Accumulation in the CFRP composite. The multiscale model predictions were in good agreement with experimental observations.
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Experimental and computational investigation of progressive Damage Accumulation in CFRP composites
Composites Part B: Engineering, 2013Co-Authors: Robert D. Crouch, Stephen B. Clay, Caglar OskayAbstract:This manuscript presents an experimental and computational study of progressive Damage Accumulation in carbon fiber reinforced polymers. A series of monotonic tension experiments with acoustic emission, X-ray radiography, and X-ray computed tomography were performed on a quasi-isotropic layup to ascertain the initiation, progression, and modes of Damage Accumulation under tensile loading. A multiscale computational model was used to aid in understanding the progressive Damage Accumulation. The eigendeformation based reduced order homogenization modeling approach was used due to its computational efficiency and its ability to incorporate distinct Damage modes. The combined experimental and computational investigation provided a detailed picture of the progression of Damage Accumulation in the CFRP composite. The multiscale model predictions were in good agreement with experimental observations. © 2013 Elsevier Ltd. All rights reserved.
Kristen Rege - One of the best experts on this subject based on the ideXlab platform.
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a one parameter nonlinear fatigue Damage Accumulation model
International Journal of Fatigue, 2017Co-Authors: Kristen Rege, Dimitrios G. PavlouAbstract:Abstract A nonlinear model for fatigue Damage Accumulation under variable amplitude loading is presented. The known assumption that the isoDamage curves are converging at the knee point of the S-N curve of the material, has been adopted. The proposed model does only require one parameter, in addition to the S-N curve of the material, in order to calculate the remaining fatigue life. A single value for the parameter has been found to give satisfying agreement with experimental data for four arbitrary selected steels, indicating a general trend.
