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      Aluminum sheet effects in viscoelastic punching

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      Beck_Gordon_Thomas_sec_1965.pdf (32.40Mb)
      Date
      1965
      Author
      Beck, Gordon Thomas
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      This project was initiated to study the effects of the sheet metal on the process of punching circular holes with viscoelastic tooling. Two different kinds of aluminum sheet metal, each with four thicknesses were used in the experiments. The mechani­cal properties of the various sheets were evaluated with particular attention being paid to the mechanical anisotropy so that this could be related to the failure during the punching operation. A new high pressure retainer was designed and built for pressurization of the viscoelastic press pads. This along with existing equipment and auxiliary apparatus for the detection of secondary fracture was used to study the primary and secondary fractures. As a result of the analysis of the primary and secondary fractures a useful prediction equation was developed. The prediction equation, with limitations, can be used to esti­mate the pressure necessary to cause complete fracture when punching holes in the aluminum sheet metals. The secondary, fracture analysis yielded contour-type plots from which the suitability of certain combinations of the process variables can be determined. These plots show that for certain combina­tions complete fracture cannot be obtained with practical pressure ratios and with other combinations an optimum punch­ing condition can be established. Suggestions for future research on viscoelastic tooling have been presented.
      Degree
      Master of Science (M.Sc.)
      Department
      Mechanical Engineering
      Program
      Mechanical Engineering
      Committee
      Whelan, John Michael; Hertz, Philip Barry
      Copyright Date
      1965
      URI
      http://hdl.handle.net/10388/etd-07192010-092429
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      • Graduate Theses and Dissertations
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