scholarly journals Influence of initial stress distribution on liquefaction-induced settlement of shallow foundations

2015 ◽  
pp. 89-99
Author(s):  
D. BERTALOT ◽  
A. J. BRENNAN
Keyword(s):  
Stress Distribution ◽  
Initial Stress ◽  
Shallow Foundations

Reference Stress for Redistribution Time in Creep of Structures

1969 ◽  
Vol 11 (4) ◽  
pp. 429-431 ◽  
Author(s):  
I. M. Bill ◽  
A. C. Mackenzie
Keyword(s):  
Steady State ◽  
Stress Distribution ◽  
Initial Stress ◽  
Creep Test ◽  
Linear Elastic ◽  
Reference Stress ◽  
Creep Analysis

When creep occurs in a structure subject to a step load the stresses redistribute with time. It is shown that if the initial stress distribution is the linear elastic one, and the material obeys an n-power creep law, the time for a particular stress to reach its steady state value may be estimated from the results of a single creep test at a selected value of stress with-out the parameters of the creep law being known. This reference stress is identified from the results of an appropriate elastic-creep analysis.

Local effects of initial stress distribution in the zone of matrix reinforcement by the fiber

1971 ◽  
Vol 3 (2) ◽  
pp. 217-220
Author(s):  
�. S. Umanskii ◽  
L. M. Lobanov ◽  
E. I. Zaluzhnaya
Keyword(s):  
Stress Distribution ◽  
Initial Stress ◽  
Local Effects ◽  
Matrix Reinforcement

scholarly journals Initial Stress Distribution of Ore in Cargo Holds

1975 ◽  
Vol 1975 (137) ◽  
pp. 196-201
Author(s):  
Yoshiyuki Yamamoto ◽  
Tamaki Ura
Keyword(s):  
Stress Distribution ◽  
Initial Stress

The earthquake arrest zone

2020 ◽  
Vol 224 (1) ◽  
pp. 581-589 ◽  
Author(s):  
Chun-Yu Ke ◽  
Gregory C McLaskey ◽  
David S Kammer
Keyword(s):  
Stress Distribution ◽  
Initial Stress ◽  
Cohesive Zone ◽  
Large Scale ◽  
Static Stress ◽  
Smooth Transition ◽  
Crack Model ◽  
Coseismic Slip ◽  
Stress Changes ◽  
Natural Earthquakes

SUMMARY Earthquake ruptures are generally considered to be cracks that propagate as fracture or frictional slip on pre-existing faults. Crack models have been used to describe the spatial distribution of fault offset and the associated static stress changes along a fault, and have implications for friction evolution and the underlying physics of rupture processes. However, field measurements that could help refine idealized crack models are rare. Here, we describe large-scale laboratory earthquake experiments, where all rupture processes were contained within a 3-m long saw-cut granite fault, and we propose an analytical crack model that fits our measurements. Similar to natural earthquakes, laboratory measurements show coseismic slip that gradually tapers near the rupture tips. Measured stress changes show roughly constant stress drop in the centre of the ruptured region, a maximum stress increase near the rupture tips and a smooth transition in between, in a region we describe as the earthquake arrest zone. The proposed model generalizes the widely used elliptical crack model by adding gradually tapered slip at the ends of the rupture. Different from the cohesive zone described by fracture mechanics, we propose that the transition in stress changes and the corresponding linear taper observed in the earthquake arrest zone are the result of rupture termination conditions primarily controlled by the initial stress distribution. It is the heterogeneous initial stress distribution that controls the arrest of laboratory earthquakes, and the features of static stress changes. We also performed dynamic rupture simulations that confirm how arrest conditions can affect slip taper and static stress changes. If applicable to larger natural earthquakes, this distinction between an earthquake arrest zone (that depends on stress conditions) and a cohesive zone (that depends primarily on strength evolution) has important implications for how seismic observations of earthquake fracture energy should be interpreted.

Influences of Horizontal Initial Stress and Slope Angle on Stress Distribution in Mountains and Cavern Stability

2011 ◽  
Vol 90-93 ◽  
pp. 688-691
Author(s):  
Li Ge Wang ◽  
Wei Shen Zhu ◽  
Kui Zhou ◽  
Xiao Li Xin
Keyword(s):  
Stress Distribution ◽  
Initial Stress ◽  
Flat Surface ◽  
Slope Angle ◽  
Jointed Rock ◽  
Vertical Profiles ◽  
Mountain Area ◽  
Rock Stability ◽  
The Many ◽  
Cavern Stability

Inbetween the many factors, which will influence the distribution character of initial stress in a mountain, different angle of mountain slopes and horizontal geostress will have important effects on it. Therefore, stress distribution in mountains under different slope angles with considering different lateral coefficients of initial stress is studied using numerical method in here. In this paper, the initial geostress distribution of mountain at typical vertical profiles are studied in the gravity field, with the slope angles being 30°, 45° and 60°, respectively. After the calculation, it can be known that the actual initial vertical stresses may be 2-5 times of the gravitational stresses calculated by direct depth gh for some zones. Meanwhile, it reveals that different horizontal geostress has a momentous impact on it as well. Computation of damage-fracture model for jointed rock is adopted to analyze the rock stability of a cavern. Comparison of the rock stability excavated in a mountain area or under a flat surface is made also.

On the Methodology of Numerical Etching

1999 ◽  
Vol 563 ◽  
Author(s):  
X. H. Wang ◽  
K. Shyu ◽  
C.-T. Chang ◽  
D. W. Zheng ◽  
Weijia Wen
Keyword(s):  
Thin Film ◽  
Residual Stress ◽  
Stress State ◽  
Numerical Analysis ◽  
Stress Distribution ◽  
Stress Field ◽  
Initial Stress ◽  
Silicon Wafer ◽  
Initial Stress Field ◽  
Actual Stress

AbstractA methodology to study the stress distribution of a patterned thin film residing on a silicon wafer was developed. Si underlying the pattern was thinned down through etching so that the deformation caused by residual stress in the microstructure could be detected by a Twyman- Green interferometer. A procedure called "numerical etching" was implemented to simulate the etching process, which linked the stress state of the microstructure on a regular wafer to that on a Si diaphragm. An initial stress field on the pattern was assumed, and its effect on the deformation of the Si diaphragm beneath was calculated and compared with experimental results. The discrepancy between them was used to modify the initially assumed stress field and repeated until a satisfactory match was achieved. The stress field from numerical analysis accurately predicts the actual stress distribution in and around the patterned structure under investigation. The stress distribution in a Ti pad on a Si3N4/ SiO2/Si composite diaphragm is used as an example.

Effects of initial stress state on the subsurface stress distribution after ultrasonic impact treatment on thick specimens

2020 ◽  
pp. 030932472097683
Author(s):  
Chuan Liu ◽  
Jiabin Shen ◽  
Changhua Lin ◽  
Jianfei Wang ◽  
Jianxin Wang
Keyword(s):  
Stress State ◽  
Stress Distribution ◽  
Tensile Stress ◽  
Compressive Stress ◽  
Initial Stress ◽  
Correction Method ◽  
Welding Residual Stress ◽  
Initial Stress State ◽  
Ultrasonic Impact Treatment ◽  
Before And After

Thick welded specimens with different initial stress states were prepared and treated with the ultrasonic impact treatment (UIT). The subsurface stresses before and after UIT were measured by the X-ray diffraction (XRD) method combined with layer removal. The measured results were corrected based on the finite element correction method. The effects of initial high tensile stress and low compressive stress on the in-depth after-UIT stress distributions were investigated. The results show that initial stress has no effects on the stresses induced by the UIT within 1 mm depth and within that depth, UIT can induce almost the same longitudinal and transverse stress curves beneath the surface with a peak compressive stress close to the material yield strength at the depth of near 0.6 mm and 0.8 mm. UIT induces almost the same longitudinal and transverse stresses along with the measured depth under initial low compressive stress state. While under the initial high tensile stress state, the initial stress dominates the final stress distribution over 1 mm depth. Initial high tensile stress (welding residual stress) can reduce the depth of the after-UIT compressive stresses to 62.5% to 75% of that under the initial low-compressive stress state.

Effect of Bead Deposition by Repair Welding on Residual Stress in Pipe Welds

2004 ◽  
Author(s):  
Masahito Mochizuki ◽  
Masao Toyoda
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Weld Metal ◽  
Initial Stress ◽  
Heat Input ◽  
Welded Joint ◽  
Repair Process ◽  
Residual Stress Distribution ◽  
Initial Residual Stress ◽  
Plastic Analysis

Residual stress by repair welds in a pipe weld is computed using the thermal elastic-plastic analysis. Weld bond and heat-affected zone of a butt-welded joint is gouged and then deposited by weld metal in repair process. Heat source is synchronously moved with the deposition of the finite-element as the weld deposition. The effects of initial stress, heat input, and weld length on residual stress distribution are studied from the organic results of numerical analysis. Initial residual stress before repair weld has no influence on the residual stress after repair treatment near weld metal, because the initial stress near weld metal releases due to high temperature of repair weld and then stress by repair weld regenerates. Heat input has an effect for residual stress distribution, for not its magnitude but distribution zone. Weld length should be considered for reducing the magnitude of residual stress in the edge of weld bead; short bead induces high tensile residual stress.

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