ar9 - Temperature Effects on Fractural Toughness of...

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50 Temperature Effects on Fractural Toughness of Polymeric Composites. By Jeremy Lyons Submitted To: Dr. Christopher Ibeh, Director PSU/NSF-REU/RET Program Pittsburg State University Kansas Technology Center December, 2003
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51 Table of Contents Summary ………………………………………………………………………… 51 Introduction ……………………………………………………………………… 51 Historical Background ……………………………………………………….… 52 Fracture Toughness …………………………………………………….………. . 55 Methodology …………………………………………………………. .……….… 57 Equipment Used ………………………………………………………. .……………. 57 Testing ………………………………………………………………………………. Specimen Preparation ………………………………………………………………. . Equipment Set-Up/Calibration ………………………………………………………. Procedure ……………………………………………………………………. ..……. 58 Specimen preparation ………………………………………………………. Calculations ……………………………………………………………. ...…. 67 J-Integral --- designated as J IC Plain Strain Fracture Toughness – designated as K IC Critical Strain Energy Release Rate – designated as G IC Results …………………………………………………………………. 69 References ……………………………………………………………. . 73 Appendix ……………………………………………………………. .. 74
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52 Summary. The Thermoset term paper project was selected to continue work that had been launched in the summer of 2003 in participation in the National Science Foundation – Research Education Undergraduate. This project continued the study in fractural toughness of polymeric composites by testing sample in extreme temperature conditions. Samples were tested at sub-zero near -25º F, at 100º F and at 225º F. The freezer located in W127 and the post curing oven in the composites lab were used to reach the extreme temperatures in conjunction with the thermal chamber which was used mainly for its insulative properties. Seven materials were selected to undergo the testing protocol; all were sheet molding compound thermoset composites 0.25 inch thick. All materials were donated with request through a contact found on the companies’ website. The results
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This note was uploaded on 02/24/2011 for the course AERO 520 taught by Professor Rs during the Spring '11 term at Istanbul Technical University.

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ar9 - Temperature Effects on Fractural Toughness of...

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