The Stress Field Created by a Circular Sliding Contact

1966 ◽  
Vol 33 (2) ◽  
pp. 371-376 ◽  
Author(s):  
G. M. Hamilton ◽  
L. E. Goodman
Keyword(s):  
Stress Field ◽  
Tensile Stress ◽  
Contact Region ◽  
Normal Pressure ◽  
Maximum Tensile Stress ◽  
Sliding Contact ◽  
Constant Yield ◽  
Circular Contact

Equations are obtained for the complete stress field due to a circular contact region carrying a “hemispherical” Hertzian normal pressure and a proportional distributed shearing traction. The equations are illustrated by graphs of a constant-yield parameter and graphs of maximum tensile stress.

Effect of Coating Geometry on Contact Stresses in Two-Dimensional Discontinuous Coatings

2000 ◽  
Vol 122 (4) ◽  
pp. 665-671 ◽  
Author(s):  
Sunil Ramachandra ◽  
Timothy C. Ovaert
Keyword(s):  
Tensile Stress ◽  
Contact Pressure ◽  
Contact Region ◽  
Solid Lubricants ◽  
Normal Pressure ◽  
Friction Reduction ◽  
Experimental Investigations ◽  
Two Dimensional ◽  
Normal Contact ◽  
Normal Contact Pressure

Recent experimental investigations have shown that discontinuous coatings, characterized by island-like coating deposits on dissimilar substrates, can exhibit improved tribological performance over equivalent continuously-coated substrates. In this analysis, the effect of coating geometry on the normal contact pressure profile was examined for several two-dimensional discontinuous coatings using a numerical elastic stress model. Normal pressure singularities were found for discontinuous coatings having both sharp and rounded edges. However, when crowned discontinuous regions were examined, the normal pressure singularities were reduced or eliminated. Interfacial tensile stress, due to an imposed tangential friction force, was also investigated. The magnitude of this tensile stress (and stress singularities due to edge configuration) was most affected by the friction coefficient and by the discontinuous coating geometry in the middle of the contact region, where the normal contact pressure was the highest. The discontinuous coating has the potential to provide reservoirs of sacrificial solid lubricants, which wear away with the coating itself, providing a friction-reduction mechanism over the life of the coating reducing the interfacial tensile stress which can lead to premature coating failure. [S0742-4787(00)01504-6]

Effect of Hydrogen on the Fracture Behavior of High-Strength Cr-Mo Steel

2006 ◽  
Vol 512 ◽  
pp. 55-60 ◽  
Author(s):  
Mao Qiu Wang ◽  
Eiji Akiyama ◽  
Kaneaki Tsuzaki
Keyword(s):  
Tensile Stress ◽  
Power Law ◽  
High Strength ◽  
Maximum Tensile Stress ◽  
Maximum Principal Stress ◽  
Slow Strain Rate Test ◽  
Diffusible Hydrogen ◽  
Thermal Desorption Spectrometry ◽  
Stress Concentration Factors ◽  
Peak Value

We examine the hydrogen embrittlement susceptibility of a high-strength AISI 4135 steel by means of a slow strain-rate test (SSRT) using notched round bar specimens. Hydrogen was introduced into the specimens by electrochemical charging and its content was measured by thermal desorption spectrometry (TDS). It was found that the maximum tensile stress decreased in a power law manner with increasing diffusible hydrogen content. Finite element method (FEM) calculations demonstrated that the peak value of the maximum principal stress and the peak value of the locally accumulated hydrogen concentration at the maximum tensile stress were in good agreement with one power law relationship for the specimens with different stress concentration factors.

Maximum Stress at Intersecting Bores of Pressurized Blocks

1994 ◽  
Author(s):  
Ajay Garg
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Tensile Stress ◽  
Element Model ◽  
Maximum Tensile Stress ◽  
Pressure Vessels ◽  
Experimental Results ◽  
Empirical Methods ◽  
Element Analysis ◽  
Matched Design

Abstract In high pressure applications, rectangular blocks of steel are used instead of cylinders as pressure vessels. Bores are drilled in these blocks for fluid flow. Intersecting bores with axes normal to each other and of almost equal diameters, produce stresses which can be many times higher than the internal pressure. Experimental results for the magnitude of maximum tensile stress along the intersection contour were available. A parametric finite element model simulated the experimental set up, followed by correlation between finite element analysis and experimental results. Finally, empirical methods are applied to generate models for the maximum tensile stress σ11 at cross bores of open and close ended blocks. Results from finite element analysis and empirical methods are further matched. Design optimization of cross bores is discussed.

Study on the long-term behaviour of glass fibre in the tensile stress field

2019 ◽  
Vol 45 (9) ◽  
pp. 11578-11583 ◽  
Author(s):  
Dapeng Wang ◽  
Qingzhao Wang ◽  
Zhiming Wang ◽  
Huanying Jiang ◽  
Zhao Zhang ◽  
...  
Keyword(s):  
Stress Field ◽  
Tensile Stress ◽  
Glass Fibre ◽  
Tensile Stress Field

scholarly journals Finite Element Simulation and Multi-Factor Stress Prediction Model for Cement Concrete Pavement Considering Void under Slab

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5294
Author(s):  
Bangyi Liu ◽  
Yang Zhou ◽  
Linhao Gu ◽  
Xiaoming Huang
Keyword(s):  
Finite Element ◽  
Tensile Stress ◽  
Concrete Slab ◽  
Three Dimensional ◽  
Mesh Size ◽  
Maximum Tensile Stress ◽  
Concrete Pavement ◽  
Slab Thickness ◽  
Void Size ◽  
Tensile Stresses

Uneven support as result of voids beneath concrete slabs can lead to high tensile stresses at the corner of the slab and eventually cause many forms of damage, such as cracking or faulting. Three-dimensional (3D) finite element models of the concrete pavement with void are presented. Mesh convergence analysis was used to determine the element type and mesh size in the model. The accuracy of the model is verified by comparing with the calculation results of the code design standards in China. The reliability of the model is verified by field measurement. The analysis shows that the stresses are more affected at the corner of the slab than at the edge. Impact of void size and void depth at the slab corner on the slab stress are similar, which result in the change of the position of the maximum tensile stress. The maximum tensile stresses do not increase with the increase in the void size for relatively small void size. The maximum tensile stress increases rapidly with the enlargement in the void size when the size is ≥0.4 m. The increments of maximum tensile stress can reach 183.7% when the void size is 1.0 m. The increase in slab thickness can effectively reduce maximum tensile stress. A function is established to calculate the maximum tensile stress of the concrete slab. The function takes into account the void size, the slab thickness and the vehicle load. The reliability of the function was verified by comparing the error between the calculated and simulated results.

Analysis of Performance Decay Behavior for Asphalt Pavement Based on Aging

2013 ◽  
Vol 723 ◽  
pp. 22-26 ◽  
Author(s):  
Pei Long Li ◽  
Zhan Ding ◽  
Zheng Qi Zhang
Keyword(s):  
Shear Stress ◽  
Service Life ◽  
Tensile Stress ◽  
Simulation Analysis ◽  
Asphalt Pavement ◽  
Maximum Shear Stress ◽  
Maximum Tensile Stress ◽  
Pavement Structure ◽  
Analysis Of Performance ◽  
Decay Behavior

Aging is a main factor affecting the durability of asphalt pavement. To study decay behavior of asphalt pavement with aging, aged asphalt was extracted from stratified pavement mixtures for different service-life. The changes of asphalt properties with service time and depth variations of the pavement were discussed. And numerical simulation analysis of pavement structure was conducted with pavement gradient modulus changes caused by aging. The results indicate that asphalt stiffness increases and low-temperature performance decays sharply with the extension of pavement service life, especially in the first several years. The vertical aging differences from top to bottom of pavement were significant, the aging extents decrease continuously from the surface, which cause the gradient changes of pavement modulus. The maximum tensile stress and maximum shear stress all increase with surface modulus increasing, so more serious aging can induce greater gradient modulus, shear stress and tensile stress are larger under the same loads, which have more serious damage to the pavement structure.

scholarly journals Stress in an Elastic Bedrock Hump Due to Glacier Flow

1977 ◽  
Vol 18 (78) ◽  
pp. 67-75 ◽  
Author(s):  
L. W. Morland ◽  
E. M. Morris
Keyword(s):  
Stress Field ◽  
Applied Load ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Normal Pressure ◽  
Cohesive Stress ◽  
Coulomb Failure ◽  
Gravity Effects ◽  
Coulomb Failure Criterion ◽  
Glacier Flow

Abstract The stress field in an isotropic elastic hump representing a typical bedrock feature is obtained for plane strain conditions. Gravity effects are included and the applied load is a normal pressure distribution deduced from an idealized model of glacier flow. A Coulomb failure criterion is applied, including the effective stress change due to pore-water pressure, and stresses on the predicted failure planes determined for different pressure amplitudes and relative gravity contributions. The latter make little difference to the maximum “failure stress" but influence the regions where such stress levels occur. Levels of cohesive stress required to inhibit Coulomb failure are obtained, and are low in general, implying that coherent rock in the adopted hump profile, subject to the model pressure, would not fail. That is, this profile is stable unless jointing introduces an easier failure mechanism.

scholarly journals Calculation of Constrained Stress in Expansive Mortar with a Composite Creep Model

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Hyeonggil Choi ◽  
Bongsuk Cho
Keyword(s):  
Tensile Stress ◽  
Creep Deformation ◽  
Maximum Tensile Stress ◽  
Composite Model ◽  
Creep Model ◽  
Hydration Products ◽  
Step Method ◽  
Creep Analysis ◽  
Measured Deformation ◽  
Expansive Additive

The creep phenomenon of hardening cement paste mixed with an expansive additive was modeled by considering the creep performance of hydration products of cement and expansive additive. A new composite model that is appropriate for particle conditions is proposed by considering the balance of the hydration products of cement and expansive additive and the stress redistribution phenomenon of hydration products newly generated by the progress of hydration. The creep of mortar and concrete mixed with the expansive additive was evaluated using a composite model of the paste and aggregate. Under the assumption that the modeled creep deformation is proportional to the stress and the gel volume of the hydration products, which allows the law of superposition to be applied, the distribution stress was predicted by applying the step-by-step method at each time increment. By predicting the maximum tensile stress applied to an inner steel ring through a creep analysis based on the measured deformation of the inner steel ring, it is possible to predict the stress progression with age to some degree.

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