Impact of surface and residual stresses and electro-/magnetostatic axial loading on the suspended nanomechanical based mass sensors: A theoretical study

2014 ◽  
Vol 115 (21) ◽  
pp. 214310 ◽  
Author(s):  
Ivo Stachiv
Keyword(s):  
Residual Stresses ◽  
Theoretical Study ◽  
Axial Loading ◽  
Mass Sensors

On the Analysis of Residual Stresses Introduced in Sheet Metals by Thermal Shock Treatment

1976 ◽  
Vol 43 (1) ◽  
pp. 117-123 ◽  
Author(s):  
T. R. Hsu ◽  
S. R. Trasi
Keyword(s):  
Residual Stresses ◽  
Thermal Shock ◽  
Theoretical Study ◽  
Numerical Technique ◽  
Iteration Scheme ◽  
Plasticity Theory ◽  
Shock Treatment ◽  
Axially Symmetric ◽  
Specific Distribution ◽  
Thin Metal Sheet

This paper presents a theoretical study of the residual stresses in a thin metal sheet with a circular hole subjected to an axially symmetric thermal shock over a concentric annular area. Quasi-static, uncoupled, thermoelastoplasticity theory incorporating the postulates of incremental plasticity theory is employed. The solution is sought through a numerical technique incorporating an iteration scheme and numerical integration. Several numerical examples are considered for a specific distribution and duration of the thermal shock and some optimization considerations are discussed.

Residual Stress Measurements of Cylindrical Parts by Hole Drilling Strain Gage Method

2013 ◽  
Vol 311 ◽  
pp. 462-466
Author(s):  
Chia Lung Chang ◽  
Yan Huo Kao ◽  
You Lung Jao ◽  
Chih Laing Chang
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Strain Gage ◽  
Infinite Plate ◽  
Axial Loading ◽  
Element Model ◽  
Cylindrical Part ◽  
Hole Drilling ◽  
Geometrical Shape ◽  
Calibration Coefficients

Hole drilling strain gage method is a semi-destructive measurement. The method is most commonly used to measure residual stresses. The relieved strains are measured around the drilled hole, and the residual stresses are estimated by the mechanical relationship between relieved strains and residual stresses as well calibration coefficients. The calibration coefficients indicate the relieved strains due to unit stresses within the hole depth. Finite element method is always used to determine the calibration coefficients, and the analytical model is based on the infinite plate. But the geometrical shape and size of cylindrical part are different from the infinite plate. The relieved strains around the drilled hole are different too. Finite element model of the cylindrical part is constructed to obtain the hole drilling calibration coefficients. The measurement of residual stresses in a cylindrical part subject to axial loading calculated by calibration coefficients of both infinite plate and cylindrical part model are compared to show the difference.

Effects of residual stresses on shaft friction of bored cast in situ piles in sand

2013 ◽  
Vol 1 (1) ◽  
pp. 37-51 ◽  
Author(s):  
Ylenia Mascarucci ◽  
Alessandro Mandolini ◽  
Salvatore Miliziano
Keyword(s):  
Residual Stresses ◽  
Axial Loading ◽  
Load Test ◽  
Soil Conditions ◽  
Shear Stresses ◽  
Stress Changes ◽  
Concrete Casting ◽  
Pile Response ◽  
Shaft Friction

The existence of residual stresses locked-in prefabricated displacement piles is a well-known problem and has been addressed by a number of researchers in the last decades. This is not the case with cast in situ piles: as a consequence of concrete curing, pile-soil interaction starts soon after concrete casting, causing stress changes in terms of both normal and shear stresses. Such circumstance has been confirmed by few experimental evidences, reported in the paper, in saturated or dry soil conditions. In order to evaluate the influence of residual stresses on the subsequent pile response to axial loading, a broad parametric study has been carried out by means of numerical modelling. Particular focus is given to the effects induced on the shaft friction of floating bored piles embedded in wet and dry sandy soils. The results have been interpreted with the aim of highlighting errors commonly made if a stress-free pile is assumed when interpreting a specific load test results on instrumented piles and/or arranging general design methods.

Theoretical Study on the Bending Deformation of Metal Plate Induced by Repetitive Laser Shot Peening

2008 ◽  
Vol 375-376 ◽  
pp. 57-61 ◽  
Author(s):  
Jian Zhong Zhou ◽  
Shu Huang ◽  
Xia Ji ◽  
Jian Jun Du ◽  
Chao Jun Yang ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Residual Stress ◽  
Residual Stresses ◽  
Theoretical Study ◽  
Pulsed Laser ◽  
Metal Plate ◽  
Analysis Model ◽  
Peen Forming ◽  
Bending Mechanism ◽  
Pulsed Laser Beam

The laser peen forming (LPF) uses high-power pulsed laser beam replacing the tiny medium balls to peen the surface of plate and generate compressive stress near the surface, the metals respond to this residual stresses by elongating at the peened surface and effectively bend the overall shape. In this paper, the deforming process of metal plate induced by repetitive pulsed laser was discussed from theory firstly, and the bending mechanism of LPF was investigated. Then a mathematical model of bending curvature concerning the depth of residual stress was presented, the influence of residual stresses on the deformation of plate was analyzed. Lastly, the line-track-peening experiment for SUS 304 plate was carried out to evaluate the reasonability of the theoretical analysis model.

scholarly journals NUMERICAL ANALYSIS FOR COMPRESSED CERAMIC HOLLOW BRICK MASONRY COLUMNS STRENGTHENED WITH GFRP MESHES

2021 ◽  
Vol 2021 (2) ◽  
pp. 76-81
Author(s):  
Serhiy Bula ◽  
◽  
Mariana Kholod ◽  
Nazarii Viter ◽  
◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Theoretical Study ◽  
Experimental Studies ◽  
Axial Loading ◽  
Ceramic Brick ◽  
Scale Models ◽  
Research Problems ◽  
Hollow Brick ◽  
High Level ◽  
Theoretical Results

This article presents the analysis of obtained experimental results for the study of masonry columns which have been strengthened by GFRP confinement after high-level axial compression loading. Ceramic hollow-brick middle-scale models were investigated regarding assumed testing program. The basics of experimental studies were briefly described in the paper. Theoretical study was performed to compare experimental and theoretical values. Such numerical analysis helps to evaluate the possibility to use the existing standard`s approaches for calculating bearing capacity of strengthened by GFRP jacketing ceramic brick columns which were subjected to the high axial loading. Theoretical results areratheraligned with experimental data. Some conclusions were provided in terms of usability the analytical model provided standards and other scientists. Addressing to the further investigation and research problems were performed.

scholarly journals Релаксация механических напряжений в эпитаксиальных пленках кубического карбида кремния на кремниевых подложках с буферным пористым слоем

2021 ◽  
Vol 91 (6) ◽  
pp. 986
Author(s):  
А.С. Гусев ◽  
Н.И. Каргин ◽  
С.М. Рындя ◽  
Г.К. Сафаралиев ◽  
Н.В. Сигловая ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Residual Stresses ◽  
Mechanical Stress ◽  
Essential Role ◽  
Theoretical Study ◽  
Study Data ◽  
Stress Distributions ◽  
Experimental Values ◽  
Cubic Silicon Carbide

The results of the work quantitatively and qualitatively illuminate the processes of relaxation of misfit stresses arising during the epitaxy of cubic silicon carbide on silicon. Analysis of stress distributions of mechanical stress in 3C-SiC / Si and 3C-SiC / por-Si heterostructures is carried out. The essential role of the porous buffer layer in reducing the magnitude of misfit stresses is shown. The theoretical study data are confirmed by the experimental values of residual stresses in 3C-SiC / Si and 3C-SiC / por-Si samples.

Interaction of Mechanical Loading with Residual Stresses in Pressure Vessels

2005 ◽  
Vol 297-300 ◽  
pp. 2278-2283
Author(s):  
Saeid Hadidi-Moud ◽  
Christopher E. Truman ◽  
David John Smith
Keyword(s):  
Residual Stresses ◽  
Axial Loading ◽  
Critical Issue ◽  
Pressure Vessels ◽  
Cylindrical Vessel ◽  
Surface Relaxation ◽  
Integrity Assessment ◽  
Circumferential Crack ◽  
Reactor Pressure

Assessment of the integrity of structures such as reactor pressure vessels is a critical issue in relevant industries. In a full integrity assessment, the presence of initial residual stresses (RS) needs to be taken into account. An initial RS field is introduced into a type 316 stainless steel cylindrical vessel with no defects and to one with a partial circumferential crack on its outer surface. Relaxation of RS following several proof load cycles, in form of internal pressure, applied to the vessel is explored using finite element simulations. It is found that the proof loading process generally relaxes the RS and is proved to be beneficial to both cracked and un-cracked vessels with or without the presence of initial RS. Interaction of residual stresses with warm pre-stressing is further investigated using A533B steel at room and low temperature subjected to axial loading. The results are compared with similar analyses but with no introduction of an initial RS field to explore the interaction effects on fracture resistance, as well as the role of partial crack on the RS distribution / redistribution. The differences are discussed and illustrated.

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