Journal of Engineering Materials and Technology: Recent submissions
Now showing items 661-680 of 3257
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Modeling of Microchannel Hydroforming Process With Thin Metallic Sheets
(The American Society of Mechanical Engineers (ASME), 2012)Micro/mesoscale metal sheet hydroforming (SHF) process is an efficient approach suitable for mass production to fabricate metal parts with micro/mesochannel features. In conventional sheet hydroforming ... -
Direct Observation of Crack Propagation in Copper–Niobium Multilayers
(The American Society of Mechanical Engineers (ASME), 2012)The failure of a cross-sectional 65 nm-thick copper and 150 nm-thick niobium multilayer thin film was investigated via an in situ transmission electron microscopy straining experiment. The fracture ... -
New Tensors for Anisotropic Damage in Continuum Damage Mechanics
(The American Society of Mechanical Engineers (ASME), 2012)In this work, new proposed damage tensors are studied in order to investigate the damage effect variables in the mechanical behavior of materials. All cases studied in this work are defined ... -
Molecular Dynamics Simulations of Diffusion of O2 and N2 Penetrants in Polydimethylsiloxane-Based Nanocomposites
(The American Society of Mechanical Engineers (ASME), 2012)Recently, metal particle polymer composites have been proposed as sensing materials for micro corrosion sensors. To design the sensors, a detailed understanding of diffusion through metal particle ... -
A New Class of Damage Variables in Continuum Damage Mechanics
(The American Society of Mechanical Engineers (ASME), 2012)In this work various new proposed damage variables are introduced, examined and compared. Only the scalar case pertaining to isotropic damage is investigated here. Several types of new damage ... -
The Influence of Lattice Misfit on the Atomic Structures and Defect Energetics of Face Centered Cubic–Body Centered Cubic Interfaces
(The American Society of Mechanical Engineers (ASME), 2012)Using “tunable” interatomic potentials, the lattice misfits for a fcc–bcc metal system have been varied in atomistic models, while keeping other properties essentially unchanged. The procedure and ... -
Process Parameters Effect on Mechanical Properties and Fatigue Behavior of Friction Stir Weld AA6060 Joints
(The American Society of Mechanical Engineers (ASME), 2012)Friction stir welding (FSW) is the most remarkable welding technology that has been invented and developed in the last decade. It is a solid-state welding process in which a rotating tool is ... -
Analysis of Carbon Nanotubes and Graphene Nanoribbons With Folded Racket Shapes
(The American Society of Mechanical Engineers (ASME), 2012)Folding of carbon nanotubes and graphene nanoribbons into a shape that looks like a tennis racket is considered. An elastic continuum model is utilized in two types of analysis. The first is ... -
Stability of Residual Stresses Created by Shot Peening in Monotonic Loading and at the Presence of Load Reversals—Experiments and Modeling
(The American Society of Mechanical Engineers (ASME), 2012)As a method for mechanical surface treatment, shot peening has been widely used to improve the fatigue strength of materials. However, the influence of residual stresses introduced by shot ... -
The Contribution of History in Plastic Behavior of Metals in Machining
(The American Society of Mechanical Engineers (ASME), 2012)Mechanical and thermal properties significantly affect many aspects of machining, such as chip formation, cutting forces, cutting temperatures, and surface integrity of machined products. One of ... -
Nanoscale Structural and Mechanical Characterization of MWCNT-Reinforced Polymer Composites
(The American Society of Mechanical Engineers (ASME), 2012)In this study, the elastic modulus of 1 wt. % multiwalled carbon nanotube (MWCNT) reinforced epoxy composite was characterized using an in-house designed micro/nano tensile load stage in conjunction ... -
Numerical Modeling of the Failure of Magnesium Tubes Under Compressive Loading
(The American Society of Mechanical Engineers (ASME), 2012)A new finite element (FE) specific failure criterion utilizing hardening rates to quantify bending stress is implemented into the MAT_124 material model in the commercial software LS-DYNA to ... -
Elasto-Plastic Stresses in a Functionally Graded Rotating Disk
(The American Society of Mechanical Engineers (ASME), 2012)A numerical method based on the extension of the variable material property method was developed to obtain the elasto-plastic stress field in a functionally graded (FG) rotating disk. The method ... -
Bond Behavior of CFRP Cured Laminates: Experimental and Numerical Investigation
(The American Society of Mechanical Engineers (ASME), 2012)The use of externally bonded carbon fiber-reinforced polymers (CFRPs) as strengthening systems to improve the condition and overall capacity of existing reinforced concrete structural members is ... -
A Novel Singular Finite Element on Mixed-Mode Dugdale Model Based Crack
(The American Society of Mechanical Engineers (ASME), 2012)The symplectic dual approach is employed to obtain the analytical solutions of displacements and stresses around the mixed-mode Dugdale crack tip. Based on the analytical solutions, a novel ... -
A Microstructure and Microhardness Characterization of a Friction Plug Weld in Friction Stir Welded 2195 Al-Li
(The American Society of Mechanical Engineers (ASME), 2012)In this study, extruded 2195-T8 plugs that were friction welded into the friction stir weld of 2195-T8 base metal plates were examined. This study characterizes the resulting microstructure and ... -
Understanding Effect of Grain Boundaries in the Fracture Behavior of Polycrystalline Tungsten under Mode-I Loading
(The American Society of Mechanical Engineers (ASME), 2012)Polycrystalline tungsten is considered as an important material in aerospace, automobile, and energy industries due to its excellent thermal and mechanical properties. While grain boundaries (GBs) ... -
Comparisons of Constitutive Models for Steel Over a Wide Range of Temperatures and Strain Rates
(The American Society of Mechanical Engineers (ASME), 2012)This study investigates and compares several available plasticity models used to describe the thermomechanical behavior of structural steel subjected to complex loadings. The main purpose of this ... -
Concurrent and Hierarchical Multiscale Analysis for Layer-Thickness Effects of Nanoscale Coatings on Interfacial Stress and Fracture Behavior
(The American Society of Mechanical Engineers (ASME), 2012)To investigate the effects of coating layer thickness on stress and the debonding behavior near the interface of coating layer and substrate, multiscale analysis is a must since molecular ... -
Mechanical Behavior of Epoxy-Graphene Platelets Nanocomposites
(The American Society of Mechanical Engineers (ASME), 2012)Various aspects of the mechanical behavior of epoxy-based nanocomposites with graphene platelets (GPL) as additives are discussed in this article. The monotonic loading response indicates that at ...