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C. Phalippou - One of the best experts on this subject based on the ideXlab platform.
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Wear generated by sliding Impacts
2015Co-Authors: T. Souilliart, E. Rigaud, A. Le Bot, C. PhalippouAbstract:Vibrations of the steam generator tubes in nuclear power plants induce stochastic Impacts between the tubes and their supports. As a consequence, wear is generated. A test rig is designed and used to perform Impacts between two metal crossed cylinders with various incident angles and Impact velocities. The normal and tangential components of the contact load are measured during the tests. Rate and Duration of Impacts, instantaneous ratio between normal and tangential loads for each Impact are deduced. Influence of incidence angle and Impact velocity on Impact Duration, ratio between tangential and normal loads during Impact and wear volume is highlighted.
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Wear induced by stochastic sliding Impacts
2015Co-Authors: T. Souilliart, E. Rigaud, A. Le Bot, C. PhalippouAbstract:Vibrations of the steam generator tubes in nuclear power plants induce stochastic Impacts between the tubes and the supports. As a consequence, wear is generated. A test rig is designed and used to perform Impacts between two metal cylinders with various incidence angles and Impact velocities. The normal and tangential components of the contact load are measured during the tests. Rate and Duration of Impacts, instantaneous ratio between normal and tangential loads for each Impact are deduced. Influence of incidence angle and Impact velocity on Impact Duration, ratio between tangential load and normal load during Impact and wear volume is highlighted.
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Wear Induced by Stochastic Sliding Impacts
Volume 7: Operations Applications and Components, 2015Co-Authors: T. Souilliart, E. Rigaud, A. Le Bot, C. PhalippouAbstract:Vibrations of the steam generator tubes in nuclear power plants induce stochastic Impacts between the tubes and their supports. As a consequence, wear is generated. A test rig is designed and used to perform Impacts between two metal crossed cylinders with various incidence angles and Impact velocities. The normal and tangential components of the contact load are measured during the tests. Rate and Duration of Impacts, instantaneous ratio between normal and tangential loads for each Impact are deduced. Influence of incidence angle and Impact velocity on Impact Duration, ratio between tangential and normal loads during Impact and wear volume is highlighted.Copyright © 2015 by ASME
T. Souilliart - One of the best experts on this subject based on the ideXlab platform.
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Wear generated by sliding Impacts
2015Co-Authors: T. Souilliart, E. Rigaud, A. Le Bot, C. PhalippouAbstract:Vibrations of the steam generator tubes in nuclear power plants induce stochastic Impacts between the tubes and their supports. As a consequence, wear is generated. A test rig is designed and used to perform Impacts between two metal crossed cylinders with various incident angles and Impact velocities. The normal and tangential components of the contact load are measured during the tests. Rate and Duration of Impacts, instantaneous ratio between normal and tangential loads for each Impact are deduced. Influence of incidence angle and Impact velocity on Impact Duration, ratio between tangential and normal loads during Impact and wear volume is highlighted.
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Wear induced by stochastic sliding Impacts
2015Co-Authors: T. Souilliart, E. Rigaud, A. Le Bot, C. PhalippouAbstract:Vibrations of the steam generator tubes in nuclear power plants induce stochastic Impacts between the tubes and the supports. As a consequence, wear is generated. A test rig is designed and used to perform Impacts between two metal cylinders with various incidence angles and Impact velocities. The normal and tangential components of the contact load are measured during the tests. Rate and Duration of Impacts, instantaneous ratio between normal and tangential loads for each Impact are deduced. Influence of incidence angle and Impact velocity on Impact Duration, ratio between tangential load and normal load during Impact and wear volume is highlighted.
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Wear Induced by Stochastic Sliding Impacts
Volume 7: Operations Applications and Components, 2015Co-Authors: T. Souilliart, E. Rigaud, A. Le Bot, C. PhalippouAbstract:Vibrations of the steam generator tubes in nuclear power plants induce stochastic Impacts between the tubes and their supports. As a consequence, wear is generated. A test rig is designed and used to perform Impacts between two metal crossed cylinders with various incidence angles and Impact velocities. The normal and tangential components of the contact load are measured during the tests. Rate and Duration of Impacts, instantaneous ratio between normal and tangential loads for each Impact are deduced. Influence of incidence angle and Impact velocity on Impact Duration, ratio between tangential and normal loads during Impact and wear volume is highlighted.Copyright © 2015 by ASME
De-yu Wang - One of the best experts on this subject based on the ideXlab platform.
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Influence of Imperfection on Dynamic Response of Cross-Stiffened Deck Subjected to In-Plane Impact
Volume 4A: Structures Safety and Reliability, 2014Co-Authors: De-yu WangAbstract:The motivation of this research is that the ship deck is subjected to uni-axial compression under sagging condition, when in the severe condition, the deck is dynamically loaded in nature, with Impact type loads, which is the reason of deck collapse under severe condition. In addition, imperfection probably substantially influences the dynamic response of the Impacted deck. Based on nonlinear explicit finite element method, the paper aims at studying the influence of three types of initial geometric imperfection on dynamic response of cross-stiffened deck subjected to in-plane Impact. Three types of imperfection are local imperfection on deck plate between stiffeners, imperfection of overall positive deflection of the deck, and imperfection of overall negative deflection of the deck. Impact function is a half sine wave function with two parameters, Impact Duration and amplitude of the Impact load. First order natural vibration period of the deck is selected as Impact Duration. Amplitude of the Impact load is selected according to the value of ultimate strength of the deck, and varied by times of the ultimate strength. Strain rate effect and Strain hardening effect of the material are accounted in the analysis. Axial residual displacement of the end of the deck after Impact is selected as dynamic response of the deck. The result shows that dynamic response of deck is sensitive to local imperfection, while not sensitive to overall imperfection under low or moderate level of imperfection magnitude. When imperfection is severe, residual axial displacement of the end of the deck is large, especially amplitude of Impact load is somewhat larger than ultimate strength. Among 3 kinds of imperfection, dynamic response of overall negative deflection imperfection is the largest, followed by that of local imperfection, while that of overall positive deflection imperfection is the least.Copyright © 2014 by ASME
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Influence of load shape on dynamic response of cross-stiffened deck subjected to in-plane Impact
Thin-Walled Structures, 2014Co-Authors: De-yu WangAbstract:Abstract Under severe sagging condition or wave slamming, ship deck is dynamically loaded in nature with Impact type load. Based on the nonlinear explicit finite element method, the paper aims at studying influence of load shape on dynamic response of a cross-stiffened deck subjected to in-plane Impact, accounting for strain rate effect, strain hardening, and potential contact of compressive components. Axial residual displacement of the Impacted end is selected as main detected dynamic response of the deck. Four parameters depicting load shape are considered; they are Impact Duration, peak load, the decaying type after reaching the peak load (here refers to second order derivative of the load), ratio between rise time of the load and total Impact Duration. The first three load shape parameters, Impact Duration, peak load and decaying type, are related to impulse. The longer the Impact Duration, the larger the peak load, the slower the decaying of the load, which can result in the larger impulse. The larger the impulse is, the larger the dynamic response of the Impacted deck is, on the condition that the Impact Duration is finite with the order of milliseconds. While the fourth load shape parameter, ratio of rise time and Impact Duration, although it is not related to impulse, it is also an important influential factor on dynamic response of the Impacted deck. The smaller the ratio of rise time and Impact Duration is, the larger the dynamic response of the Impacted deck is; if the Impact Duration is longer, the effect is more significant. So the parameter, ratio of rise time and Impact Duration, deserves more concern in future research.
E. Jacquelin - One of the best experts on this subject based on the ideXlab platform.
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Estimation of the Impact Duration for Several Types of Structures
Shock and Vibration, 2012Co-Authors: E. Jacquelin, S. Pashah, J.p. Lainé, M. MassenzioAbstract:The Impact Duration between two structures is not easy to forecast. Indeed it depends on many parameters including local parameters as well as structural parameters which characterize the dynamics of the structures.In this paper we will show that it is possible to have a prior estimation of the Impact Duration. In fact the simulations show that this parameter is connected to some characteristics of a specific model, the so-called antioscillator model, even for the complex case of the Impact between two flexible structures. All the simulations carried out on different cases show the close relationship between the first Impact Duration and the antioscillator characteristics. However some limitations exist and have been highlighted.
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Estimation of the Impact Duration for several types of structures
Shock and Vibration, 2012Co-Authors: E. Jacquelin, S. Pashah, J.p. Lainé, M. MassenzioAbstract:The Impact Duration between two structures is not easy to forecast. Indeed it depends on many parameters including local parameters as well as structural parameters which characterize the dynamics of the structures.
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On the rigid projectile model for low velocity Impacts
International Journal of Impact Engineering, 2009Co-Authors: E. JacquelinAbstract:Most of the studies about low velocity Impact aimed to determine the Impact force and the Impact Duration. The influence of the interaction law between the projectile and the target on the response has been examined; the influence of the structure model on the response has been addressed as well. However when the projectile is much more rigid than the structure, it has always been considered as an infinitely rigid mass. This paper shows that such a model tends to overestimate the maximum Impact force and underestimate the Impact Duration; however, a 2-degree-of-freedom (dof) model has been suitable to recover the Impact force very well. Moreover, it is shown that this rigid projectile may be viewed as a rigid mass associated with a modified Hertz law. These results have been established for a sphere-sphere Impact and a sphere-beam Impact as well. Nevertheless, it has been shown that the 1-dof model is definitively relevant to determine the structural response: in fact the displacement of the structure provided by the 1-dof model and the 2-dof model are the same, as indicated in the last section.
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Prediction of structural response for low velocity Impact
International Journal of Impact Engineering, 2008Co-Authors: S. Pashah, M. Massenzio, E. JacquelinAbstract:The complete modeling for Impact on flexible structures can always be done through a three-dimensional finite element model. The FEM approach is often very costly both from modeling and calculation Duration point of views, so it can be simplified by using simplified Impact models. The selection of an Impact model depends on the structural response, thus one should be able to predict the expected structural response a priori in order to select an appropriate Impact model. Impact Duration is an important parameter that can be helpful for predicting the expected structural response. This paper provides guidelines for the prediction of the structural response on the basis of Impact Duration and the fundamental period of the Impacted structure. A criterion for defining a precise upper limit of low velocity Impact is also developed.
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Structural response of Impacted structure described through anti-oscillators
International Journal of Impact Engineering, 2008Co-Authors: S. Pashah, M. Massenzio, E. JacquelinAbstract:Prediction of structural response for low velocity Impact on flexible structures is important for the selection of an appropriate Impact model. This paper considers a new modeling of an Impacted structure based on so-called anti-oscillators. The representation of an Impacted structure through its anti-oscillators permits to understand the effects of different Impact parameters on the structural response. It is shown that the first anti-oscillator permits not only to predict the expected structural response but also a good estimation of the Impact Duration.
A. Le Bot - One of the best experts on this subject based on the ideXlab platform.
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Wear generated by sliding Impacts
2015Co-Authors: T. Souilliart, E. Rigaud, A. Le Bot, C. PhalippouAbstract:Vibrations of the steam generator tubes in nuclear power plants induce stochastic Impacts between the tubes and their supports. As a consequence, wear is generated. A test rig is designed and used to perform Impacts between two metal crossed cylinders with various incident angles and Impact velocities. The normal and tangential components of the contact load are measured during the tests. Rate and Duration of Impacts, instantaneous ratio between normal and tangential loads for each Impact are deduced. Influence of incidence angle and Impact velocity on Impact Duration, ratio between tangential and normal loads during Impact and wear volume is highlighted.
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Wear induced by stochastic sliding Impacts
2015Co-Authors: T. Souilliart, E. Rigaud, A. Le Bot, C. PhalippouAbstract:Vibrations of the steam generator tubes in nuclear power plants induce stochastic Impacts between the tubes and the supports. As a consequence, wear is generated. A test rig is designed and used to perform Impacts between two metal cylinders with various incidence angles and Impact velocities. The normal and tangential components of the contact load are measured during the tests. Rate and Duration of Impacts, instantaneous ratio between normal and tangential loads for each Impact are deduced. Influence of incidence angle and Impact velocity on Impact Duration, ratio between tangential load and normal load during Impact and wear volume is highlighted.
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Wear Induced by Stochastic Sliding Impacts
Volume 7: Operations Applications and Components, 2015Co-Authors: T. Souilliart, E. Rigaud, A. Le Bot, C. PhalippouAbstract:Vibrations of the steam generator tubes in nuclear power plants induce stochastic Impacts between the tubes and their supports. As a consequence, wear is generated. A test rig is designed and used to perform Impacts between two metal crossed cylinders with various incidence angles and Impact velocities. The normal and tangential components of the contact load are measured during the tests. Rate and Duration of Impacts, instantaneous ratio between normal and tangential loads for each Impact are deduced. Influence of incidence angle and Impact velocity on Impact Duration, ratio between tangential and normal loads during Impact and wear volume is highlighted.Copyright © 2015 by ASME