Title page for etd-0909112-170006


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URN etd-0909112-170006
Author Jing-yu Lin
Author's Email Address No Public.
Statistics This thesis had been viewed 5581 times. Download 1322 times.
Department Mechanical and Electro-Mechanical Engineering
Year 2011
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Finite Element Analysis of the Residual Stress Distribution in Rolled Aluminum Plates after Tension Levelling
Date of Defense 2012-07-16
Page Count 95
Keyword
  • Flatness
  • Residual strain
  • Residual stress
  • Tension levelling
  • Finite element method
  • Abstract When an aluminum alloy plate after rolling, non-uniform residual stress distributions existed inside the plate and defects, such as edge wave, middle wave, of the plate will be induced. Usually, a levelling process will be adopted to modify the plate flatness. By numerically simulating the tension levelling process, the purpose of this thesis is to understand the final dimensions and the residual stress distribution of the aluminum plate subjected to the tension levelling process.
    This study used the finite element method as the basic theory of the numerical simulation. A 3-D model of a cold-rolled plate with a side wave, subjected to tension levelling process was constructed. Then, the effects of the variations of the tensile ratio and residual stress distribution after rolled on the residual stress distribution after levelling and the improvement of flatness were studied.
    The simulation results showed that in the wave region, the tension levelling process could eliminate more than 90% of the residual stress, in the flat region was up to 80%.Also, after leveling, the residual stress distribution in the flat region was more uniform than the wave region. After-rolled residual stresses at the wave region affected the final peak position of the wave and the stress eliminated ratio of the wave region, but showed no significant effect on the final plate width and the residual strains. After-rolled residual stresses at the flat region affected the stress elimination ratio of the  flat region only. The tensile ratio would affect the plate flatness, the plate width, stress elimination ratio, and the maximum residual stress. The higher of the tensile ratio, the more flatness of the plate would be obtained, but the higher residual strain would be induced and caused the lesser range of available plate.
    Advisory Committee
  • SHIAU,TING-NUNG - chair
  • SUN,RONG-HONG - co-chair
  • CHIEN,CHIH-HUI - advisor
  • Files
  • etd-0909112-170006.pdf
  • Indicate in-campus at 0 year and off-campus access at 2 year.
    Date of Submission 2012-09-09

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