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Improving the formability limits of ...

Kaya, Serhat.

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Improving the formability limits of lightweight metal alloy sheet using advanced processes: Finite element modeling and experimental validation .

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Improving the formability limits of lightweight metal alloy sheet using advanced processes: Finite element modeling and experimental validation ./
Author:	Kaya, Serhat.
Description:	230 p.
Notes:	Adviser: Taylan Altan.
Contained By:	Dissertation Abstracts International68-12B.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3292759
ISBN:	9780549359395

Improving the formability limits of lightweight metal alloy sheet using advanced processes: Finite element modeling and experimental validation .
Kaya, Serhat.

Improving the formability limits of lightweight metal alloy sheet using advanced processes: Finite element modeling and experimental validation . - 230 p.

Adviser: Taylan Altan.

Thesis (Ph.D.)--The Ohio State University, 2008.

Weight reduction is one of the major goals in the automotive, appliance and electronics industries. One way of achieving this goal is to use lightweight alloys such as aluminum and magnesium that have high strength to weight ratios. However, due to their limited formability at room temperature, advanced forming processes are needed. Room temperature and elevated temperature hydraulic bulge tests (using a submerged tool) were conducted for Al 5754-O and Mg AZ31-O to determine their mechanical properties. Experiments were conducted between room temperature and 225 C, at various approximate true strain rates. Strain values up to 0.7 were obtained under equi-biaxial state of stress at elevated temperatures. Flow stress curves were calculated using the membrane theory.

ISBN: 9780549359395Subjects--Topical Terms:

783786
Engineering, Mechanical.

Improving the formability limits of lightweight metal alloy sheet using advanced processes: Finite element modeling and experimental validation .
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005 20110830
008 110831s2008 ||||||||||||||||| ||eng d
020 $a 9780549359395
035 $a (UMI)AAI3292759
035 $a AAI3292759
040 $a UMI $c UMI
100 1 $a Kaya, Serhat. $3 1286055
245 1 0 $a Improving the formability limits of lightweight metal alloy sheet using advanced processes: Finite element modeling and experimental validation .
300 $a 230 p.
500 $a Adviser: Taylan Altan.
500 $a Source: Dissertation Abstracts International, Volume: 68-12, Section: B, page: 8344.
502 $a Thesis (Ph.D.)--The Ohio State University, 2008.
520 $a Weight reduction is one of the major goals in the automotive, appliance and electronics industries. One way of achieving this goal is to use lightweight alloys such as aluminum and magnesium that have high strength to weight ratios. However, due to their limited formability at room temperature, advanced forming processes are needed. Room temperature and elevated temperature hydraulic bulge tests (using a submerged tool) were conducted for Al 5754-O and Mg AZ31-O to determine their mechanical properties. Experiments were conducted between room temperature and 225 C, at various approximate true strain rates. Strain values up to 0.7 were obtained under equi-biaxial state of stress at elevated temperatures. Flow stress curves were calculated using the membrane theory.
520 $a Deep drawability of aluminum and magnesium alloys is investigated through experiments and process simulation at room temperature (using solid dies), against liquid pressure (hydroforming) and at elevated temperatures (warm forming). Limiting Draw Ratio (LDR) of Al 5754-O is increased from 2.1 (room temperature) to 2.4 when hydroforming is used as the drawing process. This value is increased to 2.9 when warm forming is used. Formability of Mg AZ31-O is found to be limited at room temperature while LDR up to 3.2 is obtained at elevated temperatures. Warm forming experiments were conducted using a servo motor driven press and a heated tool set. The in-die dwelling concept is developed by using the flexibility of the servo press kinematics and blanks were heated in the tool set prior to forming. Temperature - time measurements were made at various blank holder interface pressures in order to determine the required dwell time to heat the blank to the forming temperature. Several lubricants for elevated temperature forming were evaluated using the deep draw test and a PTFE based film was selected as a lubricant at elevated temperatures. Deep drawing tests were conducted to determine the process window (max. punch velocity as functions of blank size and temperature) for Al 5754-O and Mg AZ31-O. Maximum punch velocities of 35 mm/s and 300 mm/s were obtained for the Al and Mg alloys, respectively. Comparisons for the Mg alloy sheets from two different suppliers were made and significant differences in formability were found. Additional experiments were conducted in order to understand the effect of constant and variable punch velocity and the temperature on the mechanics of deformation. Variable punch velocity is found to improve the thickness distribution of the formed part and provide 60% reduction in the drawing time. By calculating heat transfer coefficients using inverse optimization, computational models are developed and experimental results are used to validate the predictions from the computational model.
590 $a School code: 0168.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Engineering, Metallurgy. $3 1023648
690 $a 0548
690 $a 0743
710 2 $a The Ohio State University. $3 718944
773 0 $t Dissertation Abstracts International $g 68-12B.
790 $a 0168
790 1 0 $a Altan, Taylan, $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3292759