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Q Dong - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Behavior of Carbon Fiber Explosion Containment Vessels
Journal of Pressure Vessel Technology, 2015Co-Authors: Q DongAbstract:The dynamic behavior of carbon fiber Containment Vessels subjected to internal blast loading is studied. The experimental observation of dynamic response of carbon fiber cylindrical shells is presented, in which failure modes of structures are especially concerned. The load-bearing capability and scale effect of carbon fiber cylindrical shells are discussed. Carbon fiber cylindrical shells demonstrate better explosion-resistant performance than that of glass fiber cylindrical shells for the specific types of tests and shell configurations investigated. The current study may contribute to the further understanding on the design and application of carbon fiber Containment Vessels.
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Experimental Study on Composite Containment Vessels
Volume 5: High-Pressure Technology; ASME NDE Division; 22nd Scavuzzo Student Paper Symposium and Competition, 2014Co-Authors: Q DongAbstract:In this paper, we present experimental results of tests performed on composite Containment Vessels. The experimental observations of dynamic response of glass fiber composite Vessels and carbon fiber composite Vessels are compared, in which the carbon fiber composite Vessels demonstrate better performance than that of glass fiber composite Vessels. The study on the failure of composite Vessels is also presented, in which it is found that failure modes of glass fiber composite Vessels and carbon fiber composite Vessels are different. The current study may contribute to the further understanding on the design and application of composite Containment Vessels.Copyright © 2014 by ASME
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Progress on Mechanisms of the Strain Growth Phenomenon in Containment Vessels
Volume 5: High-Pressure Technology; ASME NDE Division, 2012Co-Authors: Q DongAbstract:Strain growth is a phenomenon observed in the elastic response of Containment Vessels subjected to internal blast loading. The local response of the vessel may become larger in a later stage than its breathing mode response during the initial stage. The strain growth phenomenon has attracted great attention since it was first observed in 1976, and numerous researches have been conducted to investigate the mechanisms of the strain growth phenomenon in Containment Vessels. In this paper, some typical results on studying the mechanisms of strain growth in cylindrical and spherical Containment Vessels will be given, and the discovery of the mechanism of nonlinear modal coupling is especially highlighted. The present review may provide a good understanding on the dynamic response characteristics of cylindrical and spherical Containment Vessels subjected to internal blast loading.Copyright © 2012 by ASME
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Guidelines for the Design of Multiple-Use Explosion Containment Vessels Based on the Understanding of the Strain Growth Phenomenon
Journal of Performance of Constructed Facilities, 2011Co-Authors: Q Dong, J. Y. ZhengAbstract:The strain growth phenomenon is an unsolved fundamental problem in the dynamic elastic response of Containment Vessels subjected to internal blast loading, which may seriously influence the design of multiple-use Containment Vessels. Because strain growth may cause increased local structural deformation in multiple-use Containment Vessels, it is important to consider this phenomenon when designing multiple-use Containment Vessels. In this paper, the mechanisms of strain growth, its influencing factors, and control methods are presented. Based on the understanding of the strain growth phenomenon, the guidelines and procedures for the design of multiple-use Containment Vessels are proposed. Employing the design guidelines, application examples are presented to demonstrate how to control strain growth in Containment Vessels. Because the strain growth phenomenon has not been considered in the design method or design code for multiple-use explosion Containment Vessels, understanding of the strain growth mechan...
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Interactive mechanisms between the internal blast loading and the dynamic elastic response of spherical Containment Vessels
International Journal of Impact Engineering, 2010Co-Authors: Q Dong, J. Y. ZhengAbstract:The interactive mechanisms between internal blast loading and dynamic elastic response of spherical Containment Vessels are studied in this paper. The blast loading history in Containment Vessels can be divided into three periods, i.e. the primary-shock period, the shock-reflection period and the pressure-oscillation period. It is shown that the initial response of the Containment vessel depends on both the impulse and the shape of the primary-shock depending on the ratio of the loading period to the breathing mode period. However, during the shock-reflection period, the response of the Containment vessel can be coupled with the reflected shock waves in the vessel, especially when the dominant frequency of reflected shock waves is close to the breathing mode frequency of the vessel. During the pressure-oscillation period, the dynamic loading is mainly the oscillation of the internal pressure due to the oscillatory volume change of the vessel, which couples dissipatedly with the vibration of the vessel leading to reduced vibration amplitudes. The effects of the influential non-dimensional parameters on the resonant interaction in shock-reflection period are discussed, based on which guidelines are recommended for avoiding the strain growth in the shock-reflection period in the design of spherical Containment Vessels.
J. Y. Zheng - One of the best experts on this subject based on the ideXlab platform.
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Guidelines for the Design of Multiple-Use Explosion Containment Vessels Based on the Understanding of the Strain Growth Phenomenon
Journal of Performance of Constructed Facilities, 2011Co-Authors: Q Dong, J. Y. ZhengAbstract:The strain growth phenomenon is an unsolved fundamental problem in the dynamic elastic response of Containment Vessels subjected to internal blast loading, which may seriously influence the design of multiple-use Containment Vessels. Because strain growth may cause increased local structural deformation in multiple-use Containment Vessels, it is important to consider this phenomenon when designing multiple-use Containment Vessels. In this paper, the mechanisms of strain growth, its influencing factors, and control methods are presented. Based on the understanding of the strain growth phenomenon, the guidelines and procedures for the design of multiple-use Containment Vessels are proposed. Employing the design guidelines, application examples are presented to demonstrate how to control strain growth in Containment Vessels. Because the strain growth phenomenon has not been considered in the design method or design code for multiple-use explosion Containment Vessels, understanding of the strain growth mechan...
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Interactive mechanisms between the internal blast loading and the dynamic elastic response of spherical Containment Vessels
International Journal of Impact Engineering, 2010Co-Authors: Q Dong, J. Y. ZhengAbstract:The interactive mechanisms between internal blast loading and dynamic elastic response of spherical Containment Vessels are studied in this paper. The blast loading history in Containment Vessels can be divided into three periods, i.e. the primary-shock period, the shock-reflection period and the pressure-oscillation period. It is shown that the initial response of the Containment vessel depends on both the impulse and the shape of the primary-shock depending on the ratio of the loading period to the breathing mode period. However, during the shock-reflection period, the response of the Containment vessel can be coupled with the reflected shock waves in the vessel, especially when the dominant frequency of reflected shock waves is close to the breathing mode frequency of the vessel. During the pressure-oscillation period, the dynamic loading is mainly the oscillation of the internal pressure due to the oscillatory volume change of the vessel, which couples dissipatedly with the vibration of the vessel leading to reduced vibration amplitudes. The effects of the influential non-dimensional parameters on the resonant interaction in shock-reflection period are discussed, based on which guidelines are recommended for avoiding the strain growth in the shock-reflection period in the design of spherical Containment Vessels.
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Effects of Structural Perturbations on Strain Growth in Containment Vessels
Journal of Pressure Vessel Technology, 2009Co-Authors: Q Dong, J. Y. ZhengAbstract:Strain growth is a phenomenon observed in the elastic response of Containment Vessels subjected to internal blast loading. The local dynamic response of a Containment vessel may become larger in a later stage than its response in the initial breathing mode response stage. It has been reported in our previous study that bending modes may be excited after several cycles of breathing mode vibration, due to the dynamic instability in cylindrical and spherical shells without structural perturbations. The nonlinear modal coupling between the breathing mode and the excited bending mode is one of the causes for the strain growth observed in Containment Vessels. In this study, we demonstrate that, due to the existence of structural perturbations, various vibration modes may be excited in Containment Vessels in earlier response stage before the occurrence of nonlinear modal coupling. The linear superposition of the breathing mode and the vibration modes excited by structural perturbations may cause larger response than the pure breathing mode response, which is a different strain growth mechanism from the nonlinear modal coupling. In the later response stage when the nonlinear modal coupling happens, not only the breathing mode, but also the vibration modes excited by structural perturbations will interact nonlinearly with the bending modes excited by dynamic unstable vibration. Dynamic nonlinear finite element program, LS-DYNA, is employed to understand the effects of structural perturbations on strain growth in Containment Vessels subjected to internal blast loading.
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Further Study on Strain Growth in Spherical Containment Vessels Subjected to Internal Blast Loading
International Journal of Impact Engineering, 2009Co-Authors: Q Dong, Q.m. Li, J. Y. ZhengAbstract:Strain growth is a phenomenon observed in the elastic response of Containment Vessels subjected to internal blast loading, which is featured by the increased vibration amplitude of the vessel in a later stage. Previous studies attributed the strain growth in spherical Containment Vessels to the beating between two close vibration modes, the interactions between the vessel vibration and the reflected shock waves and the structural perturbation. In this paper, it is shown that nonlinear modal coupling is another important cause of strain growth in spherical Containment Vessels. Based on the understanding of the vibration modes in a complete spherical shell, the nonlinear modal coupling in the nonaxisymmetric response of complete spherical shells are studied using finite element method. Methods for preventing the strain growth due to nonlinear modal coupling are discussed, which provide guidelines for the engineering design of spherical Containment Vessels.
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Investigation on the Mechanisms of Strain Growth in Cylindrical Containment Vessels Subjected to Internal Blast Loading
Volume 5: High Pressure Technology; Nondestructive Evaluation Division; Student Paper Competition, 2008Co-Authors: Q Dong, J. Y. ZhengAbstract:Strain growth is a phenomenon observed in the elastic response of Containment Vessels subjected to internal blast loading. The local dynamic response of a Containment vessel may become larger in a later stage than its response in the earlier stage. In order to find out the possible mechanisms of the strain growth phenomenon, the natural frequencies and mode shapes of various vibration modes in cylindrical shells with different boundary conditions are obtained theoretically and numerically. The dynamic elastic responses of cylindrical shells subjected to internal blast loading are studied by theoretical analysis and finite element simulation using LS-DYNA. It is found that strain growth in cylindrical Containment Vessels is mainly caused by linear modal superposition and nonlinear modal coupling. The effects of the reflected blast shock waves and structural perturbation are discussed. The proposed theory for the strain growth mechanisms may guide the safe design of cylindrical Containment Vessels.Copyright © 2008 by ASME
Jinyang Zheng - One of the best experts on this subject based on the ideXlab platform.
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delamination failure of composite Containment Vessels subjected to internal blast loading
Composite Structures, 2015Co-Authors: Jinyang ZhengAbstract:Abstract Delamination failure of composite Vessels subjected to internal blast loading was studied in this paper. Experiments were conducted on several e-glass/epoxy Vessels with aluminum lining. Micro observation and fracture analysis indicated that delamination failure occurred under a wide range of explosive loadings. A finite element model was also established to explore the delamination initiation mechanism and the evolution of dynamic behavior. Delamination simulation was achieved using a tiebreak contact model and a cohesive criterion. Numerical results from the finite element analysis were compared with experimental data, which indicated that both dynamic response and delamination failure are in good agreement. An analysis of dynamic response highlighted the amplitude and phase inconsistency between neighbor layers during the vibration process, which is considered the main cause of delamination failure. The dynamic behavior evolution of delamination under different explosive loading conditions was investigated by setting a small pre-delamination in the numerical model. Results showed that the pre-delamination ignited continuous delamination in different scales of length. With the increment of explosive charge, pre-delamination extended more rapidly with many new delamination appearing and several delamination fusing with the bigger one during the extension.
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ductile and brittle failure assessment of Containment Vessels subjected to internal blast loading
International Journal of Impact Engineering, 2013Co-Authors: Yang Hu, Jinyang ZhengAbstract:Abstract Several major international design methods of explosion Containment Vessels (ECVs) refer to the items of pressure vessel codes and standards, where the fracture mechanics analysis of pressurized components should be performed to prevent the occurrence of brittle fracture. However a ductile damage mode in the form of adiabatic shear band (ASB) is frequently found as a failure mode for the Containment Vessels subjected to internal blast loading. A rate-dependent failure criterion was proposed to account for ASB propagation, and a finite element analysis of a cylindrical Containment vessel with different size of cracks is performed, where the overpressure caused by detonation was calculated and the propagation of cracks and the final fracture profile are obtained, which shows a good agreement with experimental result. The Failure assessments based on ASB mode and failure assessment diagram (FAD) method were conducted, respectively. It was found that the final fracture mode primarily depends upon the intensity of explosive load as well as loading rate in ASB mode. The assessment result based on FAD method resembles that of ASB at low or intermediate loading rate. However with increment of loading rate, the difference of assessment results based on two methods became obvious, the comparison indicates that for the structures under high strain-rate loading the ASB assessment provides better estimation of crack growth than FAD method does.
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dynamic responses of discrete multi layered explosion Containment Vessels with the consideration of strain hardening and strain rate effects
International Journal of Impact Engineering, 2010Co-Authors: Yan Chen, Jinyang Zheng, Guide DengAbstract:Abstract Explosion Containment Vessels (ECVs) are widely used to completely contain the effects of explosions. A theoretical model for calculating the dynamic plastic responses of discrete multi-layered explosion Containment Vessels (DMECVs) has been established, which considered the effects of the strain-hardening and strain-rate on the material. The maximum displacement and equivalent plastic strain formulae have been derived for “moving separately” and “moving together” response modes. With the considerations of the effects of strain-hardening and strain-rate, three-dimensional finite element models have been developed in LS-DYNA to calculate the dynamic plastic responses of DMECVs under partial loadings. It shows that analytical and numerical results support each other, which indicates their validity. The two response modes of DMECV are confirmed in different material combinations, and a non-membrane response phase of the outer ribbon layers has been identified. Furthermore, the equivalent plastic strain of the outer ribbon layer does not change during the non-membrane response phase, which is an important characteristic for the dynamics of DMECVs.
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Failure analysis for cylindrical explosion Containment Vessels
Engineering Failure Analysis, 2010Co-Authors: Jinyang Zheng, Guide Deng, Yongjun ChenAbstract:Abstract The elastic or elastic–plastic dynamical response of the explosion Containment Vessels (ECVs) subject to the impulsive loading have been studied intensively, however the damage mechanism of ECVs is still scarcely investigated. In this work two cylindrical explosion Containment Vessels under the different explosion loads are tested. The overpressure is measured and compared with the numerical result. The damage mechanism of adiabatic shear band is successfully applied to explain the failure mode of the ECVs, where the instability analysis for the thermo-viscoplastic constitutive law is conducted to yield a rate-dependent failure criterion. Based on the overpressure analysis and rate-dependent failure criterion, the shear failure mode of ECVs is studied for the first time, including the potential initial flaw in the meso-scale in the vessel. The failure analysis indicated that the rate-dependent failure criterion governs the damage mode of the vessel with the impulsive loading however the initial flaw is mainly to ignite the shear band, which has minor influence to the final failure mode of the vessel. The simulated fracture profile shows a good agreement with the experimental result.
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methods for design of explosion Containment Vessels
ASME 2008 Pressure Vessels and Piping Conference, 2008Co-Authors: Yongjun Chen, Jinyang Zheng, Guide Deng, Guoyou SunAbstract:Explosion Containment Vessels (ECVs), which can be generally classified into three categories, i.e., multiple use ECVs and one-time use ECVs, single-layered ECVs and multi-layered ECVs, metallic ECVs and composite ECVs according to the usage, structural form and the bearing unit, respectively, are widely used to completely contain the effects of explosions. There are fundamental differences between statically-loaded pressure Vessels and ECVs that operate under extremely fast loading conditions. Conventional pressure design codes, such as ASME Section VIII, EN13445 etc., can not be directly used to design ECVs. So far, a lot of investigations have been conducted to establish design method for ECVs. Several predominant effects involved in the design of ECVs such as scale effect, failure mode and failure criteria are extensively reviewed. For multiple use single-layered metallic ECVs, dynamic load factor method and AWE method are discussed. For multiple use composite ECVs, a minimum strain criteria based on explosion experiments is examined. For one-time use ECVs, a strain limit method proposed by LANL and a maximum strain criteria obtained by Russia are discussed for metallic vessel and composite vessel, respectively. Some improvements and possible future work in developing design criterion for ECVs are recommended as a conclusion.Copyright © 2008 by ASME
Guide Deng - One of the best experts on this subject based on the ideXlab platform.
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dynamic responses of discrete multi layered explosion Containment Vessels with the consideration of strain hardening and strain rate effects
International Journal of Impact Engineering, 2010Co-Authors: Yan Chen, Jinyang Zheng, Guide DengAbstract:Abstract Explosion Containment Vessels (ECVs) are widely used to completely contain the effects of explosions. A theoretical model for calculating the dynamic plastic responses of discrete multi-layered explosion Containment Vessels (DMECVs) has been established, which considered the effects of the strain-hardening and strain-rate on the material. The maximum displacement and equivalent plastic strain formulae have been derived for “moving separately” and “moving together” response modes. With the considerations of the effects of strain-hardening and strain-rate, three-dimensional finite element models have been developed in LS-DYNA to calculate the dynamic plastic responses of DMECVs under partial loadings. It shows that analytical and numerical results support each other, which indicates their validity. The two response modes of DMECV are confirmed in different material combinations, and a non-membrane response phase of the outer ribbon layers has been identified. Furthermore, the equivalent plastic strain of the outer ribbon layer does not change during the non-membrane response phase, which is an important characteristic for the dynamics of DMECVs.
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Failure analysis for cylindrical explosion Containment Vessels
Engineering Failure Analysis, 2010Co-Authors: Jinyang Zheng, Guide Deng, Yongjun ChenAbstract:Abstract The elastic or elastic–plastic dynamical response of the explosion Containment Vessels (ECVs) subject to the impulsive loading have been studied intensively, however the damage mechanism of ECVs is still scarcely investigated. In this work two cylindrical explosion Containment Vessels under the different explosion loads are tested. The overpressure is measured and compared with the numerical result. The damage mechanism of adiabatic shear band is successfully applied to explain the failure mode of the ECVs, where the instability analysis for the thermo-viscoplastic constitutive law is conducted to yield a rate-dependent failure criterion. Based on the overpressure analysis and rate-dependent failure criterion, the shear failure mode of ECVs is studied for the first time, including the potential initial flaw in the meso-scale in the vessel. The failure analysis indicated that the rate-dependent failure criterion governs the damage mode of the vessel with the impulsive loading however the initial flaw is mainly to ignite the shear band, which has minor influence to the final failure mode of the vessel. The simulated fracture profile shows a good agreement with the experimental result.
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methods for design of explosion Containment Vessels
ASME 2008 Pressure Vessels and Piping Conference, 2008Co-Authors: Yongjun Chen, Jinyang Zheng, Guide Deng, Guoyou SunAbstract:Explosion Containment Vessels (ECVs), which can be generally classified into three categories, i.e., multiple use ECVs and one-time use ECVs, single-layered ECVs and multi-layered ECVs, metallic ECVs and composite ECVs according to the usage, structural form and the bearing unit, respectively, are widely used to completely contain the effects of explosions. There are fundamental differences between statically-loaded pressure Vessels and ECVs that operate under extremely fast loading conditions. Conventional pressure design codes, such as ASME Section VIII, EN13445 etc., can not be directly used to design ECVs. So far, a lot of investigations have been conducted to establish design method for ECVs. Several predominant effects involved in the design of ECVs such as scale effect, failure mode and failure criteria are extensively reviewed. For multiple use single-layered metallic ECVs, dynamic load factor method and AWE method are discussed. For multiple use composite ECVs, a minimum strain criteria based on explosion experiments is examined. For one-time use ECVs, a strain limit method proposed by LANL and a maximum strain criteria obtained by Russia are discussed for metallic vessel and composite vessel, respectively. Some improvements and possible future work in developing design criterion for ECVs are recommended as a conclusion.Copyright © 2008 by ASME
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experimental investigation on mutilayered explosion Containment Vessels
ASME 2006 Pressure Vessels and Piping ICPVT-11 Conference, 2006Co-Authors: Jinyang Zheng, Guide Deng, Yongjun Chen, Guoyou Sun, Longmao ZhaoAbstract:Explosion Containment Vessels (ECVs) are used to fully contain the effects of high explosions. As monobloc thick-walled ECVs, which are widely used now, become larger and thicker, they are difficult in fabrication, high in cost, and uncertain in quality of very thick steel plates. A multilayered ECV (MECV) is presented to develop large-sized ECVs in this paper, which is convenient and economical in fabrication. Under static loadings the design criteria for the multilayered Vessels has been established. However, it can not be used to design MECVs because blast loadings are quite different from static loadings. Five MECVs with the same materials and dimensions except for steel ribbon winding angles were fabricated and tested under internal blast loading induced by centrally located TNT in order to develop design criteria. Dynamic strains at the outer surface of tested Vessels were measured, and fracture characteristics also were observed, which lay a solid foundation for conducting theoretic dynamic response analysis and numerical simulation, and establishing fracture criteria.Copyright © 2006 by ASME
Q.m. Li - One of the best experts on this subject based on the ideXlab platform.
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Further Study on Strain Growth in Spherical Containment Vessels Subjected to Internal Blast Loading
International Journal of Impact Engineering, 2009Co-Authors: Q Dong, Q.m. Li, J. Y. ZhengAbstract:Strain growth is a phenomenon observed in the elastic response of Containment Vessels subjected to internal blast loading, which is featured by the increased vibration amplitude of the vessel in a later stage. Previous studies attributed the strain growth in spherical Containment Vessels to the beating between two close vibration modes, the interactions between the vessel vibration and the reflected shock waves and the structural perturbation. In this paper, it is shown that nonlinear modal coupling is another important cause of strain growth in spherical Containment Vessels. Based on the understanding of the vibration modes in a complete spherical shell, the nonlinear modal coupling in the nonaxisymmetric response of complete spherical shells are studied using finite element method. Methods for preventing the strain growth due to nonlinear modal coupling are discussed, which provide guidelines for the engineering design of spherical Containment Vessels.