The Experts below are selected from a list of 1407 Experts worldwide ranked by ideXlab platform
Naveen B Kumar - One of the best experts on this subject based on the ideXlab platform.
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a novel numerical study of influencing parameter of imperfections on thin short carbon steel cylindrical shell under axial compression
International Journal of Research, 2018Co-Authors: Ramakrishna K Rao, Naveen B KumarAbstract:Thin cylindrical shell structures have big variety of applications attributable to their favorable stiffness-to-mass quantitative relation and under axial compressive loading, these shell structures fail by their buckling instability. Hence, their load carrying capability is decided by its buckling strength that successively preponderantly depends on the geometrical imperfections gift on the shell structure. The most aim of the current study is to work out the lot of influential geometrical parameter out of 2 geometrical imperfection parameters particularly, “the extent of state gift over a surface area” and its “amplitude”. To account for these geometrical parameters at the same time, the state pattern is assumed as a Dent having the form of extent of surface area as a virtually sq.. The facet length of extent of expanse is thought of as proportional to extent of state present over a neighborhood and therefore the Dent Depth is thought of as proportional to amplitude of imperfections. For the current numerical study, metallic element models of skinny short steel excellent cylindrical shells with completely different sizes of Dent are generated at 1/3 rd and 0.5 the peak of cylindrical shells and analyzed exploitation ANSYS non-linear metallic element buckling analysis.
Ramakrishna K Rao - One of the best experts on this subject based on the ideXlab platform.
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a novel numerical study of influencing parameter of imperfections on thin short carbon steel cylindrical shell under axial compression
International Journal of Research, 2018Co-Authors: Ramakrishna K Rao, Naveen B KumarAbstract:Thin cylindrical shell structures have big variety of applications attributable to their favorable stiffness-to-mass quantitative relation and under axial compressive loading, these shell structures fail by their buckling instability. Hence, their load carrying capability is decided by its buckling strength that successively preponderantly depends on the geometrical imperfections gift on the shell structure. The most aim of the current study is to work out the lot of influential geometrical parameter out of 2 geometrical imperfection parameters particularly, “the extent of state gift over a surface area” and its “amplitude”. To account for these geometrical parameters at the same time, the state pattern is assumed as a Dent having the form of extent of surface area as a virtually sq.. The facet length of extent of expanse is thought of as proportional to extent of state present over a neighborhood and therefore the Dent Depth is thought of as proportional to amplitude of imperfections. For the current numerical study, metallic element models of skinny short steel excellent cylindrical shells with completely different sizes of Dent are generated at 1/3 rd and 0.5 the peak of cylindrical shells and analyzed exploitation ANSYS non-linear metallic element buckling analysis.
Peiwei Zhang - One of the best experts on this subject based on the ideXlab platform.
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Drop-weight impact behavior of honeycomb sandwich panels under a spherical impactor
Composite Structures, 2017Co-Authors: Qing Guo Fei, Peiwei ZhangAbstract:InDentation response and energy absorption property of honeycomb sandwich panels subjected to drop-weight impact under a spherical impactor were investigated. Experiments were conducted using a pendulum-impact system. A three-dimensional finite element model with micro-structure considered was built and validated. In conjunction with experimental and numerical methods, analytical models of inDentation response and energy balance specifically aimed to solve problems of low-velocity impact of a spherical inDenter on sandwich panels were deduced. Results show that a hemispherical residual Dent caused by bending of top face-sheet and core crushing is left on top face-sheet after impact. It also concludes that more than 80% of impact energy is absorbed mostly by top face-sheet and honeycomb core. The main form of energy dissipation is plastic dissipation. In addition, parametric studies were carried out to explore effects of impact energy on impact behavior by altering impact velocity or impactor mass. Different effects are observed for the two approaches and some useful semi-empirical formulations based on both experimental and numerical results are overfitted to estimate the residual Dent Depth and energy absorbed during a drop-weight impact event on a honeycomb sandwich panel under a spherical impactor.
Chuanjun Han - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of mecanical behavior of buried pipeline impacted by perilous rock
Mechanics, 2015Co-Authors: Jie Zhang, Zheng Liang, Chuanjun HanAbstract:Bulking behaviors of buried pipeline under perilous rock impact in soil stratum and rock stratum were investigated by finite element method. And effects of pipeline parameters and perilous rock parameters on stress and strain of buried pipeline were discussed. The results show that deformation process of buried pipeline impacted by perilous rock can be divided into four stages(no deformation, initial deformation, maximum deformation and final deformation). Plastic strain area of pipeline in rock stratum is bigger than in soil stratum. High stress area, maximum stress, plastic strain and Dent Depth decrease with the increasing of internal pressure, wall thickness and buried Depth, but increase with the increasing of diameter. With the increasing of impact velocity and rock's volume, maximum plastic strain, bent length and bent Depth increase gradually. With the increasing of eccentricity distance, high stress area and Dent Depth decrease gradually, and the stress location tends to one side. DOI: http://dx.doi.org/10.5755/j01.mech.21.4.10134
B Prabu - One of the best experts on this subject based on the ideXlab platform.
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determination of more influencing geometrical parameter of Dent on buckling strength of thin plate under axial load using response surface regression
Materials Today: Proceedings, 2019Co-Authors: D Peroumal, Ranjit Kumar, B PrabuAbstract:Abstract The main aim of this paper is to determine the critical geometrical parameter of Dent, out of two geometrical parameters namely extent of Dent and Dent Depth (DD). Extent of Dent can be of any shape but for simplicity it is taken as corner rounded square shape and the measure for this shape is taken as Extent of Dent (DSL). In order to accommodate these two parameters simultaneously, FE models of thin plate with centrally located Dent of thin plate are generated by varying the Extent of Dent and Dent Depth .These generated FE models are analyzed using static nonlinear FE analysis module of ANSYS including both geometrical and material non-linearities to determine the ultimate strength of the Dented thin plates. Non-linear response surface regression analysis is carried out to fit response surface for ultimate strengths obtained from FE numerical analysis results taking the DSL and DD as input variables. From the regression analysis, it is found that Dent Depth is more dominant factor than extent of Dent
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numerical investigation of influencing parameter of imperfections on thin short carbon steel cylindrical shell under axial compression
International Journal of Modeling Simulation and Scientific Computing, 2013Co-Authors: B PrabuAbstract:Thin cylindrical shell structures have wide variety of applications due to their favorable stiffness-to-mass ratio and under axial compressive loading, these shell structures fail by their buckling instability. Hence, their load carrying capacity is decided by its buckling strength which in turn predominantly depends on the geometrical imperfections present on the shell structure. The main aim of the present study is to determine the more influential geometrical parameter out of two geometrical imperfection parameters namely, "the extent of imperfection present over a surface area" and its "amplitude". To account for these geometrical parameters simultaneously, the imperfection pattern is assumed as a Dent having the shape of extent of surface area as a nearly square. The side length of extent of surface area can be considered as proportional to extent of imperfection present over an area and the Dent Depth can be considered as proportional to amplitude of imperfections. For the present numerical study, FE models of thin short carbon steel perfect cylindrical shells with different sizes of Dent are generated at 1/3rd and half the height of cylindrical shells and analyzed using ANSYS nonlinear FE buckling analysis.
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parametric study on buckling behaviour of thin stainless steel cylindrical shells for circular Dent dimensional variations under uniform axial compression
International journal of engineering science and technology, 2010Co-Authors: B Prabu, A V Raviprakash, N RathinamAbstract:It is well known that thin cylindrical shell structures have wide applications as one of the important structural elements in many engineering fields and its load carrying capacity is decided by its buckling strength which in turn predominantly depends on geometrical imperfections present in it. Geometrical imperfections can be classified as local and distributed geometrical imperfections. But in this work, only local geometrical imperfection namely Dent is considered for analysis. The main aim of this study is to determine the more influential dimensional parameter out of two Dent dimensional parameters, one is the extent of Dent present over a surface area and the other is Dent Depth, which affect the buckling strength of the cylindrical shells drastically. To account for the parameter “extent of Dent present over an area”, the Dent is considered as circular Dent and its amplitude is considered as Dent Depth. For this purpose, finite element (FE) models of cylindrical shells with a circular Dent at half the height of cylindrical shells having different Dent sizes are generated. These FE models are analyzed using ANSYS nonlinear buckling analysis. It is concluded that extent of Dent present over an area is more influential than Dent Depth. To verify this conclusion further, FE models of cylindrical shells with two circular Dents at half the height of cylindrical shell placed at 180° apart having different Dent sizes are generated and analyzed. Keywords: Thin cylindrical shell, Buckling strength, Geometrical imperfections, Dents.