Study of High Temperature Crack Initiation in Single Crystal
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
mechanical wiki
Active In SP

Posts: 150
Joined: Sep 2009
03-09-2009, 11:04 PM

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, exposed to an oxidizing environment and subjected to mechanical loading. The time to crack initiation under creep and fatigue loading conditions has been predicted using a strain-based failure criterion. The problem has been solved using a two dimensional finite element analysis. A notched compact tension specimen has been studied with a casting defect, idealized as a cylindrical void, close to the notch surface. The analysis predicts that, due to the strong localization of inelastic strain at the void, a microcrack will initiate in the vicinity of the void rather than at the notch. The numerical results have shown that the time or number of cycles to crack initiation depends strongly on the applied load level and the void location. The coupled diffusion-deformation finite element studies have shown that environmental effects (i.e. oxidation) reduce the time or number of cycles to crack initiation, due to the oxidation-induced material softening in the vicinity of the notch and void
Use Search at wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion

Important Note..!

If you are not satisfied with above reply ,..Please


So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page

Quick Reply
Type your reply to this message here.

Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  temperature based fan speed controller ppt jaseelati 0 197 23-02-2015, 01:53 PM
Last Post: jaseelati
  inversion of single slider crank mechanism ppt jaseelati 0 233 16-02-2015, 04:45 PM
Last Post: jaseelati
  automatic temperature controlled fan ppt jaseelati 0 167 31-01-2015, 02:15 PM
Last Post: jaseelati
Question How to making best bike in high milaze? HARI PRIYA1 2 427 24-10-2013, 09:26 PM
Last Post: luckynaik
  CRACK AND ITS PROPAGATION PPT seminar projects maker 0 241 21-09-2013, 02:12 PM
Last Post: seminar projects maker
  DESIGN MODELING AND ANALYSIS OF SINGLE PLATE CLUTCH project girl 2 2,503 18-09-2013, 11:04 AM
Last Post: seminar projects maker
  Conductively Cooled Superconducting Magnet System with Room Temperature seminar projects maker 0 323 11-09-2013, 04:14 PM
Last Post: seminar projects maker
  Conductively Cooled Superconducting Magnet System with Variable Temperature Insert seminar projects maker 0 401 11-09-2013, 04:13 PM
Last Post: seminar projects maker
Last Post: study tips
  Study of Desert Cooler study tips 0 339 10-08-2013, 12:59 PM
Last Post: study tips