Fracture Toughness Testing of Plastics under Various Environmental Conditions

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The primary objective of this study is to test the applicability to plastics of a fracture toughness testing tool developed for metals. The intent is to study pre-test conditioning of several plastic materials and the effect of the depth of the razor notch cut in the chevron notched fracture toughness test specimens. The study includes the careful preparation of samples followed by conditioning in various environments. Samples were subjected to laboratory air for a specific duration or to a controlled temperature-humidity condition as per the ASTM D1870. Some of the samples were subjected to vacuum conditioning under standard test specifications. ... continued below

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viii, 105 leaves : ill.

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Velpuri, Seshagirirao V. December 1997.

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This thesis is part of the collection entitled: UNT Theses and Dissertations and was provided by UNT Libraries to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 153 times , with 6 in the last month . More information about this thesis can be viewed below.

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  • Velpuri, Seshagirirao V.

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Description

The primary objective of this study is to test the applicability to plastics of a fracture toughness testing tool developed for metals. The intent is to study pre-test conditioning of several plastic materials and the effect of the depth of the razor notch cut in the chevron notched fracture toughness test specimens. The study includes the careful preparation of samples followed by conditioning in various environments. Samples were subjected to laboratory air for a specific duration or to a controlled temperature-humidity condition as per the ASTM D1870. Some of the samples were subjected to vacuum conditioning under standard test specifications. Testing was conducted using the conventional three-point bend test as per ASTM D5045-95. ASTM E1304, which sets a standard for short rod and bar testing of metals and ceramics provides some basis for conducting chevron notched four-point bend tests to duplicate the toughness tool. Correlation of these results with the ASTM test samples is determined. The four-point bend test involves less specimen machining as well as time to perform the fracture toughness tests. This study of fracture toughness testing has potential for quality control as well as the fracture property determination.

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viii, 105 leaves : ill.

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  • December 1997

Added to The UNT Digital Library

  • March 24, 2014, 8:07 p.m.

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  • June 26, 2014, 2:09 p.m.

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Velpuri, Seshagirirao V. Fracture Toughness Testing of Plastics under Various Environmental Conditions, thesis, December 1997; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc278346/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .