Determination of abutment pressure from surface displacements

1974 ◽  
Vol 10 (5) ◽  
pp. 551-555 ◽  
Author(s):  
F. M. Érlikhman
Keyword(s):  
Abutment Pressure ◽  
Surface Displacements

Energy for crack growth in model rubber components

1972 ◽  
Vol 7 (2) ◽  
pp. 132-140 ◽  
Author(s):  
P B Lindley
Keyword(s):  
Fatigue Life ◽  
Crack Growth ◽  
Crack Surface ◽  
Uniform Stress ◽  
Numerical Techniques ◽  
Surface Displacements ◽  
Tearing Energy ◽  
Crack Growth Rates ◽  
Essential Prerequisite

The determination of tearing energy, i.e. the energy available for crack growth, is an essential prerequisite for the estimation of the fatigue life of rubber components. Three methods of determining tearing energy are considered: from changes in total energy, from crack surface displacements, and by comparison with known values for the same crack growth rates. It is shown by applying experimental and numerical techniques to plane-stress testpieces, not necessarily of uniform stress or thickness, that the methods are satisfactory.

Determination of abutment pressure zones during overworking of preparatory workings

1972 ◽  
Vol 8 (2) ◽  
pp. 134-137
Author(s):  
I. A. Petukhov ◽  
V. I. Doroshenko
Keyword(s):  
Abutment Pressure

A Numerical Elastoplastic Model for Rough Contact

1995 ◽  
Vol 117 (3) ◽  
pp. 422-429 ◽  
Author(s):  
C. Mayeur ◽  
P. Sainsot ◽  
L. Flamand
Keyword(s):  
Yield Criterion ◽  
Kinematic Hardening ◽  
Three Dimensional ◽  
Surface Shape ◽  
Real Surface ◽  
Pressure Distributions ◽  
Surface Displacements ◽  
Elastic Shakedown ◽  
Von Mises

Pressure distributions due to surface roughness in contact induce high stresses just beneath the surface. These stresses can bring on crack initiation and micro-pitting. A purely elastic contact model to account for these effects is restrictive because stress fields often exceed the yield strength of the material. Plastic flow occurs and modifies the surface shape and material properties (work hardening). This paper presents a numerical model for elastoplastic rough contact. It allows the determination of real pressures and permanent surface displacements (flattening of asperities) as well as residual stress and plastic strains useful in fatigue analysis). The material is assumed to obey the Von-Mises yield criterion with linear kinematic hardening. Real surface profiles obtained from a measurement can be considered. In addition, simplified methods have been used to treat cyclic loading. Thus the ability of a rough surface to reach an elastic shakedown state can be investigated, even for a three-dimensional contact found, for instance, in roller bearings.

Simultaneous measurement of three displacement derivatives using a multiple image-shearing interferometric camera

1979 ◽  
Vol 14 (3) ◽  
pp. 81-88 ◽  
Author(s):  
Y Y Hung ◽  
A J Durelli
Keyword(s):  
Vibration Isolation ◽  
Light Illumination ◽  
Coherent Light ◽  
Interference Phenomenon ◽  
Multiple Image ◽  
Surface Displacements ◽  
Complete State ◽  
Derivatives Of ◽  
Bent Plates

This paper describes a multiple image-shearing camera. By incorporating coherent light illumination, the camera serves as a multiple-shearing speckle interferometer which measures the derivatives of surface displacements with respect to three directions simultaneously. The application of the camera to the study of flexural strains in bent plates is shown, and the determination of the complete state of two-dimensional strains is also considered. The multiple image-shearing camera uses an interference phenomenon, but is less demanding than holographic interferometry with respect to vibration isolation and the coherence of the light source. It is superior to other speckle techniques in that the obtained fringes are of much better quality.

scholarly journals Assessment of Geotechnical Hazard due to Deep Excavations in Bogota Clays: A Contribution for Sustainability in Urban Environments

2020 ◽  
Vol 29 (54) ◽  
pp. e11373
Author(s):  
Jorge Arturo Pineda-Jaimes ◽  
Cesar Augusto García-Ubaque ◽  
Rodrigo Elías Esquivel-Ramírez
Keyword(s):  
Urban Environments ◽  
Soft Soils ◽  
Deep Excavations ◽  
Surface Displacements ◽  
Vertical Ground ◽  
Three Stages ◽  
Strength And Stiffness ◽  
Hazard Level ◽  
The City

The development of resilient and sustainable cities considers the construction of infrastructure projects that involve deep excavations. During excavations, surface displacements frequently occur that may be inadmissible for previously constructed elements of the urban environment, threatening the sustainability of already consolidated sectors. In this article, we present an approximation to the estimation of the geotechnical hazard  by deep excavations in soft lacustrine soils of Bogotá, DC, using parametric numerical simulations that sought to establish the probability of occurrence of base bottom heave, and the estimation of surface displacements for variable excavation geometries. A database was consolidated from 85 projects found in geotechnical zones having soft soils in the city. From this base, statistically representative values of shear strength and stiffness were determined, and a statistically representative geotechnical profile of the lacustrine clays was prepared for parametric analyzes. The hazard estimation was developed in three stages: construction of the geotechnical model, approach of hazard scenarios and determination of the hazard level. The following parameters were considered: excavation geometry (base and height), safety factor, failure probability and vertical ground displacements (settlements). Finally, a matrix is ​​presented to determine the hazard level by excavations in the soft soils of Bogotá, whose data provide a prior assessment that contributes to promoting resilience and sustainability of already developed areas.

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