FRACTURE TOUGHNESS TESTING OF PLASTICS UNDER VARIOUS ENVIRONMENTAL CONDITIONS

/ y 8( AO. 7 V 6 3 ACKNOWLEDGEMENT I first wish to express my gratitude to my advisor and major professor Dr. George W. Watt. His scientific curiosity, encouragement, and guidance through out this work have been necessary for this thesis. I had invaluable and stimulating discussions with Dr. Watt through the course of this work that answered most of my questions. I also would like to thank Dr. Phillip R. Foster, Associate Professor in the Department of Engineering Technology, UNT, who patiently taught me the use of various jigs, fixtures, and method of specimen preparation. I also thank Dr. Ratan Kumar