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Amit Pandey's blog

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Concept of Yield Point or Elastic Limit?

A similar discussion on this forum raised many interesting point about- Stress or strain: which one is more fundamental?

http://imechanica.org/node/1001 

On a similar note I would like to address this decade old fundamental question on how do we define yield point of a material?  

 

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Reliability Summer Internship (Rolls Royce and LG Fuel Cells)

 Fuel Cell Ceramics Reliability Summer Intern. 

 

Interested candidates with a background in mechanical, material science. solid mechanics please email your resume to amit.pandey/at/lgfcs/dot/com with the subject title "Fuel Cell

Ceramics Reliability Summer Intern"

http://www.rolls-royce.com/careers/search-and-apply/job-content?language...

 

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Thermo-mechanical response: Role of Porosity and Microcracking (in particular)

Below are references to some of our ongoing work that is published and is related to study the role of microcracking (in particular) and porosity to the thermo-mechanical response of functional ceramics. This study is  relevant to understand the structural reliability of the systems such as the SOFC's (solid oxide fuel cells) and DPF's (diesel particulate filters).

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Mechanical responses and deformation mechanisms of an AZ31 Mg alloy- Part 2

Recent paper is Part-2 of the paper mentioned below

 http://imechanica.org/node/10104 

http://www.sciencedirect.com/science/article/pii/S0749641910001142 

Mechanical responses and deformation mechanisms of an AZ31 Mg alloy sheet under dynamic and simple shear deformations

 

Abstract

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Additive manufacturing --> microstructure-->mechanical response

Tensile behavior of selective laser melted Ferritic Oxide Dispersion Strengthened Steel was evaluated for the first time and correlated to microstructures.

 

http://www.sciencedirect.com/science/article/pii/S1359645414009732

 

Abstract

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in-situ Young's moduli of the constitutive layers in a multilayer systems (e.g. thin films, SOFCs, TBCs etc.)

 

This recent article present an improved methodology to calculate in-situ Young's moduli of the constitutive layers in a multilayer systems (e.g. thin films, SOFCs, TBCs etc.)

Pandey, A., Shyam, A., Liu, Z., & Goettler, R. (2014). In-situ Young’s Moduli of the Constitutive Layers in a Solid Oxide Fuel Cell. Journal of Power Sources.

 

http://www.sciencedirect.com/science/article/pii/S0378775314015341 

 

Highlights

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in-situ Young's moduli of the constitutive layers in a multilayer systems (e.g. thin films, SOFCs, TBCs etc.)

 

This recent article presents an improved methodology to calculate in-situ Young's moduli of the constitutive layers in a multilayer systems (e.g. thin films, SOFCs, TBCs etc.)

 

Amit Pandey, Amit Shyam, Zhien Liu, Richard Goettler, In-situ Young's moduli of the constitutive layers in a solid oxide fuel cell, Journal of Power Sources, Volume 273, 1 January 2015, Pages 522-529

 

http://www.sciencedirect.com/science/article/pii/S0378775314015341 

 

Highlights

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Seminal research work: in-situ mechanical testing under electron microscope

A lot work has been done/published in the area of in-situ mechanical testing using electron microscopy. Please list which, according to what you feel has had a significant impact. Here are two in my opinion:

 Uchic, M. D., Dimiduk, D. M., Florando, J. N., & Nix, W. D. (2004). Sample dimensions influence strength and crystal plasticity. Science, 305(5686), 986-989.

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TMS- 2015 CALL FOR ABSTRACT (Symposium on HIGH TEMPERATURE SYSTEMS FOR ENERGY CONVERSION AND STORAGE)

HIGH
TEMPERATURE SYSTEMS FOR ENERGY CONVERSION AND STORAGE

 

TMS Division: Functional Material Division (FMD
formerly known as EMPMD)

FMD sub-committee: Energy Conversion and Storage

 

Organizers:

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Fuel Cell Ceramics Reliability Summer Intern (Rolls-Royce PLC & LG Corp.)

 Fuel Cell Ceramics Reliability Summer Intern. 

Interested candidates with a background in mechanical, material science. solid mechanics please email your resume to amit.pandey/at/lgfcs/dot/com with the subject title "Fuel Cell
Ceramics Reliability Summer Intern"

 

--------------------------------------------

 

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Negative to positive strain rate sensitivity in 5xxx series aluminum alloys

In continuation to our previous work on 5xxx series Al alloys

Experimental and numerical investigations of yield surface, texture, and deformation mechanisms in AA5754 over low to high temperatures and strain rates
node/14353

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The Uniaxial Tensile Response of Porous and Microcracked Ceramic Materials

http://onlinelibrary.wiley.com/doi/10.1111/jace.12720/abstract

The Uniaxial Tensile Response of Porous and Microcracked Ceramic Materials

Amit Pandey,§,*,†,‡ Amit Shyam,§,* Thomas R. Watkins,§,* Edgar Lara-Curzio,§,** Randy J. Stafford,¶,* and Kevin J. Hemker||

§Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, 37831 Tennessee

‡Reliability Division, Rolls Royce LG Fuel Cell System Inc., North Canton 44720

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Developmental Thermal Barrier Coating Bond Coats

Thermomechanical Behavior of Developmental Thermal Barrier Coating Bond Coats

Authors: Amit Pandey 1, 2, Vladimir K. Tolpygo 3,  Kevin J. Hemker 1

1. The Johns Hopkins University, Department of Mechanical Engineering

2. Oak Ridge National Laboratory, Materials Science and Technology Division

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Stress Relaxation

2012-07-10

I would like to seek comments on : Room temperature stress relaxation and governing mechanisms that contribute to the plasticity that occurs during this process. As, most of the available work on relaxation is done at elevated temperatures.

Please check more on this thread by hari@

node/12687

 I have also attach papers by Prof Hart and Prof Krempl that did throw some light on this particular subject.

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tension/compression assymetry problem in Abaqus

Hello all

 I am trying to model a composite material with different tension and compression modulus (elastic analysis).  Does anyone know how to do it ??

 

Thanks for help.

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