Material Properties for Use in FEA Modeling: Sealant Behavior with Ambient Laboratory Climate Aging

2004 ◽  
Vol 1 (7) ◽  
pp. 11603 ◽  
Author(s):  
AT Wolf ◽  
HL Cleland-Host
Keyword(s):  
Material Properties ◽  
Fea Modeling

Design and Simulation of a Compact Electromagnetic Actuator for the Synchronized Segmentally Interchanging Pulley Transmission System (SSIPTS)

2011 ◽  
Author(s):  
Peter Baoping Wen ◽  
Vahid Mashatan ◽  
Jean W. Zu
Keyword(s):  
Material Properties ◽  
Transmission System ◽  
Comsol Multiphysics ◽  
Electromagnetic Actuator ◽  
Optimized Design ◽  
The Novel ◽  
Minimum Mass ◽  
Performance Requirements ◽  
Fea Modeling ◽  
Simulation Results

This paper presents a practical approach of FEA modeling and optimization of the design of the compact electromagnetic actuator. This special actuator is designed to perform the gear shifts in the synchronized segmentally interchanging pulley transmission system (SSIPTS.) The geometry and material properties of the actuator, which are confined by the assembling space and running condition of SSIPTS, are parametrically optimized by using FEA package, Comsol Multiphysics. The current density of coil, the geometric parameters of magnet, and the permeability of structural materials are major control variables in the optimization of the novel actuator. The target of the optimization process is to find the maximum electromagnetic force and the minimum mass of the entire device within the available space in the transmission package. The simulation results for the optimized design are presented and further compared with the performance requirements of the actuator.

Thermomechanical Characterization and Modeling of Ni60Ti40 SMA for Actuated Chevrons

Aerospace ◽  
2006 ◽  
Author(s):  
Darren Hartl ◽  
Brent Volk ◽  
Dimitris C. Lagoudas ◽  
Frederick Calkins ◽  
James Mabe
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Material Properties ◽  
Mechanical Response ◽  
System Behavior ◽  
Jet Engine ◽  
Fea Modeling ◽  
Primary Focus ◽  
Thermomechanical Characterization

This work describes the thermomechanical characterization and preliminary FEA modeling of commercial jet engine chevrons incorporating active Shape Memory Alloy (SMA) beam components. The SMA beams, when activated, induce the necessary bending forces on the chevron structure to deflect it into the fan flow and reduce noise. The primary focus of this work is the characterization of the SMA material (Ni60Ti40 wt%) chosen to actuate these chevrons and the preliminary modeling of the active chevron system behavior. To fully understand the material and calibrate the model, various thermomechanical experiments are performed on both untrained and trained standard SMA tensile specimens. Material properties for the shape memory alloy components are derived from this tensile experimentation. By using this data, a 3-D FEA implementation of a phenomenological SMA model is calibrated and used to analyze the response of a system motivated by the active chevron. The problem modeled consists of a pre-curved SMA beam clamped firmly against a straight aluminum substrate. The model proves to be an accurate tool for predicting the mechanical response of such a system subject to defined thermal inputs.

Grain boundary segregation in metals

1992 ◽  
Vol 50 (2) ◽  
pp. 1204-1205
Author(s):  
C.L. Briant
Keyword(s):  
Fracture Surface ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Material Properties ◽  
Electron Spectroscopy ◽  
High Vacuum ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Local Concentration ◽  
The One

Grain boundary segregation is the process by which solute elements in a material diffuse to the grain boundaries, become trapped there, and increase their local concentration at the boundary over that in the bulk. As a result of this process this local concentration of the segregant at the grain boundary can be many orders of magnitude greater than the bulk concentration of the segregant. The importance of this problem lies in the fact that grain boundary segregation can affect many material properties such as fracture, corrosion, and grain growth.One of the best ways to study grain boundary segregation is with Auger electron spectroscopy. This spectroscopy is an extremely surface sensitive technique. When it is used to study grain boundary segregation the sample must first be fractured intergranularly in the high vacuum spectrometer. This fracture surface is then the one that is analyzed. The development of scanning Auger spectrometers have allowed researchers to first image the fracture surface that is created and then to perform analyses on individual grain boundaries.

Relationships Between Grain Boundary Structure and Material Properties

1980 ◽  
Vol 38 ◽  
pp. 366-369
Author(s):  
Brian Ralph ◽  
Barlow Claire ◽  
Nicola Ecob
Keyword(s):  
Grain Boundary ◽  
Material Properties ◽  
Main Property ◽  
Grain Structure ◽  
Boundary Structure ◽  
Grain Boundary Structure ◽  
Property Changes

This brief review seeks to summarize some of the main property changes which may be induced by altering the grain structure of materials. Where appropriate an interpretation is given of these changes in terms of current theories of grain boundary structure, and some examples from current studies are presented at the end of this paper.

Bone material properties as measured by Reference Point Indentation are low in subjects with acromegaly

2016 ◽  
Author(s):  
Frank Malgo ◽  
Neveen A T Hamdy ◽  
Alberto M Pereira ◽  
Nienke R Biermasz ◽  
Natasha M Appelman-Dijkstra
Keyword(s):  
Material Properties ◽  
Reference Point ◽  
Bone Material ◽  
Bone Material Properties ◽  
Reference Point Indentation
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