The Experts below are selected from a list of 60729 Experts worldwide ranked by ideXlab platform
Hans Gregersen - One of the best experts on this subject based on the ideXlab platform.
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Longitudinal residual strain and Stress-strain relationship in rat small intestine.
Biomedical engineering online, 2006Co-Authors: Yanling Dou, Jingbo Zhao, Yanhua Fan, Hans GregersenAbstract:Background To obtain a more detailed description of the Stress-free state of the intestinal wall, Longitudinal residual strain measurements are needed. Furthermore, data on Longitudinal Stress-strain relations in visceral organs are scarce. The present study aims to investigate the Longitudinal residual strain and the Longitudinal Stress-strain relationship in the rat small intestine.
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Longitudinal residual strain and Stress strain relationship in rat small intestine
Biomedical Engineering Online, 2006Co-Authors: Jingbo Zhao, Yanling Dou, Hans Gregersen, Yanhua FanAbstract:To obtain a more detailed description of the Stress-free state of the intestinal wall, Longitudinal residual strain measurements are needed. Furthermore, data on Longitudinal Stress-strain relations in visceral organs are scarce. The present study aims to investigate the Longitudinal residual strain and the Longitudinal Stress-strain relationship in the rat small intestine. The Longitudinal zero-Stress state was obtained by cutting tissue strips parallel to the Longitudinal axis of the intestine. The Longitudinal residual Stress was characterized by a bending angle (unit: degrees per unit length and positive when bending outwards). Residual strain was computed from the change in dimensions between the zero-Stress state and the no-load state. Longitudinal Stresses and strains were computed from stretch experiments in the distal ileum at luminal pressures ranging from 0–4 cmH2O. Large morphometric variations were found between the duodenum and ileum with the largest wall thickness and wall area in the duodenum and the largest inner circumference and luminal area in the distal ileum (p 0.5). The Longitudinal residual strain was tensile at the serosal surface and compressive at the mucosal surface. Hence, the neutral axis was approximately in the mid-wall. The Longitudinal residual strain and the bending angle was not uniform around the intestinal circumference and had the highest values on the mesenteric sides (p < 0.001). The Stress-strain curves fitted well to the mono-exponential function with determination coefficients above 0.96. The α constant increased with the pressure, indicating the intestinal wall became stiffer in Longitudinal direction when pressurized. Large Longitudinal residual strains reside in the small intestine and showed circumferential variation. This indicates that the tissue is not uniform and cannot be treated as a homogenous material. The Longitudinal stiffness of the intestinal wall increased with luminal pressure. Longitudinal residual strains must be taken into account in studies of gastrointestinal biomechanical properties.
Denis Thibault - One of the best experts on this subject based on the ideXlab platform.
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residual Stress characterization in low transformation temperature 13 cr 4 ni stainless steel weld by neutron diffraction and the contour method
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2010Co-Authors: Denis Thibault, Philippe Bocher, Marc Thomas, Michael A Gharghouri, Marjolaine CoteAbstract:Abstract This study presents the results of residual Stress characterization by neutron diffraction and the contour method on 13%Cr–4%Ni welds made using 410NiMo weld filler metal. The transverse, Longitudinal and normal components of Stress were determined by neutron diffraction. The Longitudinal Stress distribution was also measured by the contour method. The last bead of the weld was found to be in a state of triaxial compression while a part of the heat-affected zone as well as a region beneath the weld were in a state of Longitudinal tension. These results are explained with reference to the low martensitic transformation start temperature (Ms) of the alloy. The same measurements were made on an identical weld that had undergone a standardized post-weld heat treatment. The maximum tensile Stress was reduced from 534 to 136 MPa, and the maximum compressive Stress was reduced from 371 to 152 MPa.
Marjolaine Cote - One of the best experts on this subject based on the ideXlab platform.
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residual Stress characterization in low transformation temperature 13 cr 4 ni stainless steel weld by neutron diffraction and the contour method
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2010Co-Authors: Denis Thibault, Philippe Bocher, Marc Thomas, Michael A Gharghouri, Marjolaine CoteAbstract:Abstract This study presents the results of residual Stress characterization by neutron diffraction and the contour method on 13%Cr–4%Ni welds made using 410NiMo weld filler metal. The transverse, Longitudinal and normal components of Stress were determined by neutron diffraction. The Longitudinal Stress distribution was also measured by the contour method. The last bead of the weld was found to be in a state of triaxial compression while a part of the heat-affected zone as well as a region beneath the weld were in a state of Longitudinal tension. These results are explained with reference to the low martensitic transformation start temperature (Ms) of the alloy. The same measurements were made on an identical weld that had undergone a standardized post-weld heat treatment. The maximum tensile Stress was reduced from 534 to 136 MPa, and the maximum compressive Stress was reduced from 371 to 152 MPa.
Yanling Dou - One of the best experts on this subject based on the ideXlab platform.
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Longitudinal residual strain and Stress-strain relationship in rat small intestine.
Biomedical engineering online, 2006Co-Authors: Yanling Dou, Jingbo Zhao, Yanhua Fan, Hans GregersenAbstract:Background To obtain a more detailed description of the Stress-free state of the intestinal wall, Longitudinal residual strain measurements are needed. Furthermore, data on Longitudinal Stress-strain relations in visceral organs are scarce. The present study aims to investigate the Longitudinal residual strain and the Longitudinal Stress-strain relationship in the rat small intestine.
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Longitudinal residual strain and Stress strain relationship in rat small intestine
Biomedical Engineering Online, 2006Co-Authors: Jingbo Zhao, Yanling Dou, Hans Gregersen, Yanhua FanAbstract:To obtain a more detailed description of the Stress-free state of the intestinal wall, Longitudinal residual strain measurements are needed. Furthermore, data on Longitudinal Stress-strain relations in visceral organs are scarce. The present study aims to investigate the Longitudinal residual strain and the Longitudinal Stress-strain relationship in the rat small intestine. The Longitudinal zero-Stress state was obtained by cutting tissue strips parallel to the Longitudinal axis of the intestine. The Longitudinal residual Stress was characterized by a bending angle (unit: degrees per unit length and positive when bending outwards). Residual strain was computed from the change in dimensions between the zero-Stress state and the no-load state. Longitudinal Stresses and strains were computed from stretch experiments in the distal ileum at luminal pressures ranging from 0–4 cmH2O. Large morphometric variations were found between the duodenum and ileum with the largest wall thickness and wall area in the duodenum and the largest inner circumference and luminal area in the distal ileum (p 0.5). The Longitudinal residual strain was tensile at the serosal surface and compressive at the mucosal surface. Hence, the neutral axis was approximately in the mid-wall. The Longitudinal residual strain and the bending angle was not uniform around the intestinal circumference and had the highest values on the mesenteric sides (p < 0.001). The Stress-strain curves fitted well to the mono-exponential function with determination coefficients above 0.96. The α constant increased with the pressure, indicating the intestinal wall became stiffer in Longitudinal direction when pressurized. Large Longitudinal residual strains reside in the small intestine and showed circumferential variation. This indicates that the tissue is not uniform and cannot be treated as a homogenous material. The Longitudinal stiffness of the intestinal wall increased with luminal pressure. Longitudinal residual strains must be taken into account in studies of gastrointestinal biomechanical properties.
B W Schafer - One of the best experts on this subject based on the ideXlab platform.
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effect of Longitudinal Stress gradients on elastic buckling of thin plates
Journal of Engineering Mechanics-asce, 2007Co-Authors: B W SchaferAbstract:This paper analyzes the effect of Longitudinal Stress gradients on the elastic buckling of thin isotropic plates. Two types of thin plates are considered: (1) a plate simply supported on all four edges and rotationally restrained on two Longitudinal edges; and (2) a plate simply supported on three edges with one Longitudinal edge free and the opposite Longitudinal edge rotationally restrained. These two cases illustrate the influence of Longitudinal Stress gradient on stiffened and unstiffened elements, respectively. A semianalytical method is derived and presented herein to calculate the elastic-buckling Stress of both types of rectangular thin plates subjected to nonuniform applied Longitudinal Stresses. Finite-element analysis using ABAQUS is employed to validate the semianalytical model for plates with fixed and/or simple supports. Empirical formulas are produced to calculate the buckling coefficients of plates with fixed and/or simple supports under Longitudinal Stress gradients. The results help establish a better understanding of the effect of Longitudinal Stress gradients on the elastic buckling of thin plates and are intended to aid in the development of design provisions to include these effects in the strength prediction of thin-walled beams under moment gradients.
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effect of Longitudinal Stress gradient on the ultimate strength of thin plates
Thin-walled Structures, 2006Co-Authors: B W SchaferAbstract:When thin-walled sections are subjected to a moment gradient, the plates that comprise the section are themselves subjected to a Longitudinal Stress gradient. This paper analyzes the effect of Longitudinal Stress gradient on the ultimate strength of thin plates. Two types of thin plates are investigated: (1) plates simply supported on all four edges; and (2) plates simply supported on three edges, and with one Longitudinal edge free. These two cases illustrate the influence of Longitudinal Stress gradient on stiffened and unstiffened elements of cold-formed steel sections, respectively. Nonlinear finite element analysis (ABAQUS) was performed to determine the ultimate strength of thin plates under a Longitudinal Stress gradient. The results indicate that the Longitudinal Stress gradient increases the strength of both types of thin plates, but has significantly more influence on unstiffened elements than stiffened elements. The beneficial effect of Longitudinal Stress gradients can be accounted for in design by using a plate buckling coefficient modified to account for the Longitudinal Stress gradient, an example of the impact of this change on a common cold-formed steel channel is provided.
