Coupled deformation-diffusion effects in the mechanics of faulting and failure of geomaterials

2001 ◽  
Vol 54 (6) ◽  
pp. 483-502 ◽  
Author(s):  
JW Rudnicki
Keyword(s):  
Field Studies ◽  
Review Article ◽  
Stress And Strain ◽  
Shear Cracks ◽  
Material Parameters ◽  
Mechanics Of Faulting ◽  
Mass Injection ◽  
Diffusion Effects ◽  
Water Well ◽  
Well Level

This review article discusses the applications of poroelasticity to the mechanics of faulting and failure in geomaterials. Values of material parameters inferred from laboratory and field studies are summarized. Attention is focused on solutions for shear dislocations and shear cracks. A common feature is that undrained response, invoked by rapid slip or deformation, is stiffer than drained response, which occurs for slower slip or deformation. The time and spatial variation of the stress and pore pressure is different for slip on permeable and impermeable planes. These solutions are applied to interpretation of water well level changes due to slip, earthquake precursory processes, and stabilization of spreading slip zones. Inclusion models for reservoirs, aquifers, and other inhomogeneities are formulated and the results are applied to stress and strain changes caused by fluid mass injection or withdrawal. This article has 120 references.

Study of the Creep Deformation of Sanicro 25 Austenitic Steel by Computer Simulations

2019 ◽  
Vol 961 ◽  
pp. 156-162
Author(s):  
Tri Widodo Besar Riyadi ◽  
Fakhri Hasamulhaq Ahmad ◽  
Ibham Veza ◽  
Agung Setyo Darmawan ◽  
Agus Dwi Anggono ◽  
...  
Keyword(s):  
Experimental Data ◽  
Austenitic Steel ◽  
Power Law ◽  
Tube Wall ◽  
Cylindrical Tube ◽  
Stress And Strain ◽  
Uniform Temperature ◽  
Material Parameters ◽  
Simulation Input ◽  
Abaqus Software

The Abaqus software was used to simulate the creep behavior of a cylindrical tube of Sanicro-25 austenitic steel under an internal pressure of 11.3 MPa at a uniform temperature at 750 °C. The data used for the simulation input were obtained from the experimental data of a previous work. The hidden information of material parameters was estimated from the shape of creep strain versus time plots obtained from the experimental data. The validated results between the simulation and the experimental data produced the material parameter of the creep power law which were set at 2.6 x 10-22 for the power law constant and 9 for the stress exponent. The parameters were further used to explore the stress and strain inside and outside of the tube wall and the thickness changes of the tube wall.

Review article: Financial stress and strain associated with terminal cancer—a review of the evidence

2007 ◽  
Vol 21 (7) ◽  
pp. 595-607 ◽  
Author(s):  
Barbara Hanratty ◽  
Paula Holland ◽  
Ann Jacoby ◽  
Margaret Whitehead
Keyword(s):  
Financial Stress ◽  
Review Article ◽  
Terminal Cancer ◽  
Stress And Strain

Application and Research of Numerical Simulation for Rubber Like Material with MSC.Marc

2008 ◽  
Vol 575-578 ◽  
pp. 854-858
Author(s):  
Jian Bing Sang ◽  
Bo Liu ◽  
Zhi Liang Wang ◽  
Su Fang Xing ◽  
Jie Chen
Keyword(s):  
Numerical Simulation ◽  
Energy Function ◽  
Strain Energy ◽  
Strain Energy Function ◽  
Stress And Strain ◽  
Perfect Agreement ◽  
Energy Functions ◽  
Material Parameters ◽  
User Subroutine ◽  
Strain Energy Functions

This paper starts with a discussion on the theory of finite deformation and various types strain energy functions of rubber like material, the material parameter of elastic law of Gao[3] is estimated by experiment and numerical simulation. Because there are various types of strain energy functions, a user subroutine is programmed to implement the strain energy function of Gao[3] into the program of MSC.Marc, which offers a convenient method to analyze the stress and strain of rubber-like material with the strain energy function that is needed. Two examples will be presented in this paper to demonstrate the use of the framework for rubber like materials. One is to simulate a foam tube in compression. The other one is to simulate a rectangle board with a circular hole. After numerical analysis, it is proved the numerical results based on Gao model are in perfect agreement with the results based on Mooney model and the estimated material parameters are valid.

Microstructurally Motivated Constitutive Models for Mouse Arteries

2009 ◽  
Author(s):  
Laura Hansen ◽  
William Wan ◽  
Rudolph Gleason
Keyword(s):  
Vascular Remodeling ◽  
Carotid Arteries ◽  
Constitutive Models ◽  
Axial Loading ◽  
Local Environment ◽  
Stress And Strain ◽  
Biaxial Testing ◽  
Material Parameters ◽  
Local Stresses ◽  
Testing Data

Vascular remodeling occurs as cells sense changes in their mechanical environment. Thus, quantifying the cells’ local environment in terms of stress and strain distributions is an important aspect in studies of vascular remodeling. Knowledge of the constitutive behavior of vessel will allow the local stresses and strains to be calculated given applied loads and geometry. The goal of this study is to determine material parameters for several constitutive models by fitting biaxial testing data from mouse carotid arteries cultured under different axial loading conditions [1].

Identifying the Distribution of Heterogeneous Anisotropic Elastic Properties in Cerebral Aneurysms

2009 ◽  
Author(s):  
Xuefeng Zhao ◽  
Madhavan L. Raghavan ◽  
Jia Lu
Keyword(s):  
Arterial Wall ◽  
Cerebral Aneurysms ◽  
Wall Stress ◽  
Constitutive Behavior ◽  
Stress And Strain ◽  
Rupture Risk ◽  
Material Parameters ◽  
Heterogeneous Nature ◽  
Anisotropic Elastic

Cerebral aneurysms are focal dilatations of the intracranial arterial wall, whose rupture risk is likely related to pressure induced wall stress. Fundamental to stress and strain prediction in aneurysms is the constitutive behavior of wall tissue. However, delineating the constitutive equation of aneurismal tissue, in particular, experimental determination of the material parameters, presents some significant challenges due to the nonlinear, anisotropic and heterogeneous nature of the aneurysmal tissue.

scholarly journals The Search for an Efficient Black Fly Trap for Xenomonitoring of Onchocerciasis

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Kenneth B. Otabil ◽  
Samuel F. Gyasi ◽  
Esi Awuah ◽  
Daniels Obeng-Ofori ◽  
Mario A. Rodríguez-Pérez ◽  
...  
Keyword(s):  
Field Studies ◽  
Review Article ◽  
Black Flies ◽  
Disease Dynamics ◽  
Black Fly ◽  
Ethical Concerns ◽  
Health Community ◽  
Human Landing ◽  
Control Programmes ◽  
The 1960S

Onchocerciasis is a neglected tropical disease that has plagued mankind for decades with pathologies that involve the eyes and the skin. The WHO and the global health community have earmarked the disease for global elimination by 2045. However, as control programmes shift focus from reduction of the burden of the disease to elimination, new tools and strategies may be needed to meet targets. Monitoring Onchocerca volvulus larvae in the black fly vectors is an important tool needed to monitor disease dynamics and certify elimination. For decades, human landing collections have been the sole means of acquiring vectors for monitoring of the disease. This procedure has been plagued with ethical concerns and sometimes the inability to harvest enough black flies needed to carry out effective monitoring. Since the 1960s, the WHO recognized the need to replace human landing collections but relatively few field studies have designed and tested alternative traps. This review article systematically discusses some of the key traps tested, their successes, and their challenges. It is the aim of the review to direct research and development focus to the most successful and promising vector traps which could potentially replace the human landing collections.

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