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Nonlinearities and Imperfections in Creep Stability
The effects of material and geometric nonlinearities and imperfections on the 'safe-load-limit' and the 'safe-service-period' of structures...

Inelastic Mechanisms in Dynamically Loaded Ceramics
The dynamic response of ceramic materials has been the subject of intense research in the past decade. In this paper, we succinctly describe a plate impact experiment of a star-shaped...

Large Deformation Analysis of Cardiac Structures
The finite element technique can be used to simulate the response of the cardiac structures that have complex shape and geometry and nonlinear material properties. This paper enumerates...

Non-Linear Passive Elastic Properties of the Left Ventricular Myocardium: Application of Finite Element Analysis to 3-D Geometry Obtained from Ultrasound Images
A finite element (FE) analysis and an optimization algorithm were employed to assess the nonlinear passive elastic properties of left ventricular myocardium in a canine mode. The three-dimensional...

Contact Problems in Cell Adhesion
Adhesion of biological cells plays an important role in many physiological processes. For instance, the adhesion of killer T-lymphocyte to its target cell is an essential step in cytolysis,...

Computational Mechanics: Constitutive Modeling and Performance Analysis
The availability of supercomputers in the 80's has brought about a revolution in the analysis and design of complex structures. Parallel with this, computers have played a...

Analysis of a CMC Compact Tension Specimen
A cohesive force model is applied to study the stability of fiber failure in a ceramic matrix composite compact tension specimen. By controlling the length of the bridged crack results...

Characterization of Acoustic Emission Signals
Separation of crack growth signals is of fundamental importance for detecting, locating and determining the significance of an internal flaw using acoustic emission techniques. An analytical...

The Application of Computerized Tomography for Determining Material Properties
X-ray computerized tomography (CT) is an imaging technique that has been used by the medical community for a number of years and is well documented. However, the adaption of this technique...

Cement and Concrete Characterization by Scanning Electron Microscopy
The scanning electron microscope (SEM) is a powerful tool for the microstructural and chemical characterization of cement and concrete. Imaging techniques such as secondary electron, backscattered...

Studies of the Interfacial Properties of Fiber Reinforced Cement
The multiple fiber pull-out tests were conducted with steel wires and alkali resistant glass fiber strand in order to characterize the behavior of interface of fiber and cementitious matrix....

Mechanical Behavior of Composites with Interphases
The effect of interphases on the mechanical behavior of fiber-reinforced composites is studied. Two problems, a cracked fiber in a matrix, and a fiber pulled out of a matrix, are discussed....

Theoretical and Experimental Mechanisms of Toughening in Multi-phase Materials
Multi-phase materials are an important class of materials being developed for aerospace primary structural applications. Multi-phase materials are those materials consisting of two or...

Nonlocality of Continuum Approximation of Microcracked Materials
A continuum with nonlocal damage has recently been shown to be an effective approach for the analysis of strain-softening structures. The basic idea is that only the damage, normally caused...

A Phenomenological Approach to Physico Chemical Phenomena Coupled with Damage in Massive Concrete
This paper presents the first experiments which have been done to support the bases of a thermomechanical model coupled with damage and to identify the characteristics parameters needed...

Instability and Plastic Flow of Soils
Materials should according to Drucker's postulate become unstable when the second increment of plastic work is negative. Experimental observations however show otherwise....

Modeling of Successive Impacts in Sand
The principal aspects of numerical modeling of successive, high energy impacts in sand are discussed in this paper. These include the numerical formulation used for solution of the equations...

Comparison of a Microscopic Model and a Macroscopic Model Predictions on the Stress-Strain Behavior of a Soil
The stress-strain behavior of a soil under drained triaxial conditions was simulated using the Microscopic constitutive model TRUBAL. The model parameters for the Macroscopic constitutive...

Constitutive Relations for Granular Solids Accounting for Heterogeneous Deformation Fields
Under high deviatoric stress levels corresponding to large strains, the deformation of granular media is highly heterogeneous. A micro-mechanical approach is developed here to model the...

A Time-Dependent Microplane Model for Creep of Cohesive Soils
The microplane model is used in this paper to describe the time-dependent (creep) behavior of cohesive soils (clays). The constitutive equations are defined on each of a set of microplanes...

 

 

 

 

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