Some propositions on caustics and an application to the biaxial-fracture problem |
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| Authors: | K Shimizu S Takahashi H Shimada |
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| Institution: | (1) Faculty of Engineering, Department of Mechanical Engineering, Kanto Gakuin University, 236 Yokohama, Japan;(2) Faculty of Engineering, Department of Metal Processing and Mechanical Metallurgy, Tohoku University, 980 Sendai, Japan |
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| Abstract: | Some fundamental problems on the optical method of caustics, which is used to determine the value of the stress-intensity factor, are studied. The paper shows that the radiusr
o of the initial curve considerably affects the results and describes a method to eliminate this effect. This method is also applied to the biaxial-stress fracture problem. It is shown that the biaxial stress affects the fracture toughness of thin specimens of Plexiglas sheets and that the fatigue-crack-growth rate is increased due to the compressive stress along the crack line.Paper was presented at 1982 SESA/JSME Spring Meeting held in Oahu and Maui, HI on May 23–29, 1982. |
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