The Experts below are selected from a list of 9321 Experts worldwide ranked by ideXlab platform
Hyeon Gyu Beom - One of the best experts on this subject based on the ideXlab platform.
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the Concentration of stress and Strain in finite thickness elastic plate containing a circular hole
International Journal of Solids and Structures, 2008Co-Authors: Zheng Yang, Changboo Kim, Chongdu Cho, Hyeon Gyu BeomAbstract:Abstract The elastic stress and Strain fields of finite thickness large plate containing a hole are systematically investigated using 3D finite element method. It is found that the stress and Strain Concentration Factors of the finite thickness plate are different even if the plate is in elasticity state except at notch root of plate surface. The maximum stress and Strain do not always occur on the mid plane of plate. They occur on the mid plane only in thin plate. The maximum stress and Strain Concentration Factors are not on mid plane and the locations of maximum stress and Strain Concentration Factors are different in thick plate. The maximum stress and Strain Concentration Factors of notch root increase from their plane stress value to their peak values, then decrease gradually with increasing thickness and tend to each constant related to Poisson’s ratio of plate, respectively. The stress and Strain Concentration Factors at notch root of plate surface are the same and are the monotonic descent functions of thickness. Their values decrease rapidly and tend to each constant related to Poisson’s ratio with plate thickness increasing. The difference between maximum and surface value of stress Concentration Factor is a monotonic ascent function of thickness. The thicker the plate is or the larger the Poisson’s ratio is, the larger the difference is. The corresponding difference of Strain Concentration Factor is similar to the one of stress Concentration Factor. But the difference magnitude of stress Concentration Factor is larger than that of Strain Concentration Factor in same plate.
Zheng Yang - One of the best experts on this subject based on the ideXlab platform.
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the stress and Strain Concentrations of an elliptical hole in an elastic plate of finite thickness subjected to tensile stress
International Journal of Fracture, 2009Co-Authors: Zheng YangAbstract:The elastic stress and Strain fields in a plate of finite thickness containing an elliptical hole are systematically investigated using the 3D finite element method. It is found that the stress and Strain Concentrations are different in the plate of finite thickness even if the plate is in an elastic state. The relation between the stress and the Strain Concentration Factors depends on Poisson’s ratio, the hole’s geometric configuration and the plate thickness. The stress Concentration Factor is equal to the Strain Concentration Factor only at the notch root of the plate surface. The stress (or Strain) Concentration Factor at the notch root of the plate surface decreases rapidly with increasing thickness and becomes lower than the stress and Strain Concentration Factors corresponding to the plane stress state or at the notch root of the mid plane. It is too low to reflect the overall stress Concentration as the thickness increases or as the b/a ratio decreases. The maximum stress Concentration Factor occurs on the mid plane only when the plate is thinner than the transition thickness of the stress Concentration Factor. When the plate is thicker than the transition thickness of the stress Concentration Factor, the distance between the location of the maximum stress Concentration Factor and plate surface tends to be constant with increasing thickness for the plate with a given b/a ratio. The differences between the maximum value and the surface value of the stress and Strain Concentration Factors increase rapidly and tend to their respective constant values with increasing plate thickness. The smaller the b/a ratio, the larger these differences. The difference of the stress Concentration Factor is larger than that of the Strain Concentration Factor in the same plate.
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the Concentration of stress and Strain in finite thickness elastic plate containing a circular hole
International Journal of Solids and Structures, 2008Co-Authors: Zheng Yang, Changboo Kim, Chongdu Cho, Hyeon Gyu BeomAbstract:Abstract The elastic stress and Strain fields of finite thickness large plate containing a hole are systematically investigated using 3D finite element method. It is found that the stress and Strain Concentration Factors of the finite thickness plate are different even if the plate is in elasticity state except at notch root of plate surface. The maximum stress and Strain do not always occur on the mid plane of plate. They occur on the mid plane only in thin plate. The maximum stress and Strain Concentration Factors are not on mid plane and the locations of maximum stress and Strain Concentration Factors are different in thick plate. The maximum stress and Strain Concentration Factors of notch root increase from their plane stress value to their peak values, then decrease gradually with increasing thickness and tend to each constant related to Poisson’s ratio of plate, respectively. The stress and Strain Concentration Factors at notch root of plate surface are the same and are the monotonic descent functions of thickness. Their values decrease rapidly and tend to each constant related to Poisson’s ratio with plate thickness increasing. The difference between maximum and surface value of stress Concentration Factor is a monotonic ascent function of thickness. The thicker the plate is or the larger the Poisson’s ratio is, the larger the difference is. The corresponding difference of Strain Concentration Factor is similar to the one of stress Concentration Factor. But the difference magnitude of stress Concentration Factor is larger than that of Strain Concentration Factor in same plate.
David L Mcdowell - One of the best experts on this subject based on the ideXlab platform.
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polycrystal orientation distribution effects on microslip in high cycle fatigue
International Journal of Fatigue, 2003Co-Authors: V P Bennett, David L McdowellAbstract:Abstract A principal issue in High Cycle Fatigue (HCF) of polycrystalline metals is the degree of heterogeneity of cyclic slip processes. Under low cycle fatigue (LCF) conditions, persistent slip bands and small cracks are fairly uniformly distributed among grains, leading to low variability of small fatigue crack nucleation and propagation processes. For HCF conditions, the cyclic plastic slip processes are highly heterogeneously distributed among grains and the surface crack density is sparse [1] . This work utilizes computational crystal plasticity to assess the degree of heterogeneity of cyclic plastic deformation for cyclic loading below the yield point among large sets of grains in a single phase polycrystal, using a two-dimensional micromechanical approach based on crystal plasticity. Different realizations of aggregates of grains with random orientations of slip systems are considered for cyclic tension–compression and shear. By examining different microstructure realizations at different Strain amplitudes, statistical information is obtained which provides insight into the dependence of fatigue crack formation and early growth on the heterogeneity inherent in actual polycrystalline alloys. It is shown that the cyclic plastic shear Strain Concentration Factor within the microstructure is more severe under cyclic shear than under cyclic tension–compression in the nominally elastic loading regime.
Chongdu Cho - One of the best experts on this subject based on the ideXlab platform.
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the Concentration of stress and Strain in finite thickness elastic plate containing a circular hole
International Journal of Solids and Structures, 2008Co-Authors: Zheng Yang, Changboo Kim, Chongdu Cho, Hyeon Gyu BeomAbstract:Abstract The elastic stress and Strain fields of finite thickness large plate containing a hole are systematically investigated using 3D finite element method. It is found that the stress and Strain Concentration Factors of the finite thickness plate are different even if the plate is in elasticity state except at notch root of plate surface. The maximum stress and Strain do not always occur on the mid plane of plate. They occur on the mid plane only in thin plate. The maximum stress and Strain Concentration Factors are not on mid plane and the locations of maximum stress and Strain Concentration Factors are different in thick plate. The maximum stress and Strain Concentration Factors of notch root increase from their plane stress value to their peak values, then decrease gradually with increasing thickness and tend to each constant related to Poisson’s ratio of plate, respectively. The stress and Strain Concentration Factors at notch root of plate surface are the same and are the monotonic descent functions of thickness. Their values decrease rapidly and tend to each constant related to Poisson’s ratio with plate thickness increasing. The difference between maximum and surface value of stress Concentration Factor is a monotonic ascent function of thickness. The thicker the plate is or the larger the Poisson’s ratio is, the larger the difference is. The corresponding difference of Strain Concentration Factor is similar to the one of stress Concentration Factor. But the difference magnitude of stress Concentration Factor is larger than that of Strain Concentration Factor in same plate.
Changboo Kim - One of the best experts on this subject based on the ideXlab platform.
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the Concentration of stress and Strain in finite thickness elastic plate containing a circular hole
International Journal of Solids and Structures, 2008Co-Authors: Zheng Yang, Changboo Kim, Chongdu Cho, Hyeon Gyu BeomAbstract:Abstract The elastic stress and Strain fields of finite thickness large plate containing a hole are systematically investigated using 3D finite element method. It is found that the stress and Strain Concentration Factors of the finite thickness plate are different even if the plate is in elasticity state except at notch root of plate surface. The maximum stress and Strain do not always occur on the mid plane of plate. They occur on the mid plane only in thin plate. The maximum stress and Strain Concentration Factors are not on mid plane and the locations of maximum stress and Strain Concentration Factors are different in thick plate. The maximum stress and Strain Concentration Factors of notch root increase from their plane stress value to their peak values, then decrease gradually with increasing thickness and tend to each constant related to Poisson’s ratio of plate, respectively. The stress and Strain Concentration Factors at notch root of plate surface are the same and are the monotonic descent functions of thickness. Their values decrease rapidly and tend to each constant related to Poisson’s ratio with plate thickness increasing. The difference between maximum and surface value of stress Concentration Factor is a monotonic ascent function of thickness. The thicker the plate is or the larger the Poisson’s ratio is, the larger the difference is. The corresponding difference of Strain Concentration Factor is similar to the one of stress Concentration Factor. But the difference magnitude of stress Concentration Factor is larger than that of Strain Concentration Factor in same plate.