Study of High Temperature Crack Initiation in Single Crystal


Because of their excellent high temperature characteristics, Ni-based single-crystal alloys are used in applications where operating temperatures exceed 900ºC. The initiation of cracks under these conditions is generally associated with micro-scale porosities (typically between 10 and 20 microns). A rate-dependent crystallographic constitutive model in conjunction with a mass diffusion model has been used to study crack initiation in single crystal nickel-base superalloys ....etc

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Because of their excellent high temperature characteristics, Ni-based single-crystal alloys are used in applications where operating temperatures exceed 900ºC. The initiation of cracks under these conditions is generally associated with micro-scale porosities (typically between 10 and 20 microns). A rate-dependent crystallographic constitutive model in conjunction with a mass diffusion model has been used to study crack initiation in single crystal nickel-base superalloys, exposed to an oxidizing environment and subjected to ....etc

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Stress multiaxiality factor for crack growth prediction using the strain energy density theory
Abstract
The multiaxiality factor defined as the ratio of the von-Misses equivalent stress to the volumetric stress has been reported to be related to the initiation and progression of failure in structures. It is demonstrated in the present paper that the location around the crack tip where the multiaxiality factor obtains minimum value is an indicator of the direction of minimum material fracture resistance for crack propagation. I ....etc

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i m sangeetha
currently i m doing project on rail crack detector.
in this we r using ir transmitter & receiver to sense and one dc motor ,relay setup to stop the train.
I NEED
1) in real time how for does the ir sense , their full infomation
2)how it controls the train ....etc

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I need entire Vb .net project on the above topic ....etc

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This article is a full guide which includes five parts, and the following content will show you how to Crack DRM Video, Rip a DVD, burn a DVD, backup iPod File and make iPhone Ringtone.

(1) How to Crack DRM video and audio files.
(2) How to Rip a DVD to put it on iPod/iPhone 3G/PSP/Zune/Sansa View/iRiver¦¦
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Part 1: How to crack DRM video ....etc

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MONITORING CRACK GROWTH IN PRESSURE VESSELS BY ACOUSTIC EMISSION TECHNIQUE
SEMINAR REPORT
Submitted by
NAHUSHAN.Y
ENGINEERING DEPARTMENT OF MECHANICAL
COLLEGE OF ENGINEERING TRIVANDRUM
August 2010



ABSTRACT

AE-Analysis is an extremely powerful technology that can be deployed within a wide range of usable applications of non-destructive testing: metal pressure vessels, piping systems, reactors, and similar. The growing discontinuities in pressure vessels and structures under ....etc

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hai friends, is there any method to sense the cracks on railway track by placing the sensors just beside the track. ....etc

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Ductile Mixed-mode Fracture Criterion Development and Crack Growth Simulations




Stable tearing crack growth (slow ductile growth of a macroscopic crack in a load-bearing structure) is an important fracture failure process in ductile materials (e.g. metals) and usually precedes the final catastrophic failure of a structure. In recent years, there has been a growing demand for a simulation-based structural design and evaluation methodology that takes into account the stable tearing crack growth process. Within such a methodology, two too ....etc

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Stable tearing crack growth (slow ductile growth of a macroscopic crack in a load-bearing structure) is an important fracture failure process in ductile materials (e.g. metals) and usually precedes the final catastrophic failure of a structure. In recent years, there has been a growing demand for a simulation-based structural design and evaluation methodology that takes into account the stable tearing crack growth process. Within such a methodology, two tools must be available: (1) an efficient computer simulation code that can handle the kinem ....etc

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