A study of hysteresis in theK ID -å relation |
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Authors: | J. W. Dally R. K. Agarwal R. J. Sanford |
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Affiliation: | (1) Department of Mechanical Engineering, University of Maryland, 20742 College Park, MD |
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Abstract: | A photoelastic study of high speed crack propagation in Homalite 100 was conducted to measure hysteresis in the constitutive relation forK ID -å. The fracture specimen was designed to obtain both crack acceleration and deceleration during a single crack extension. Additional loads perpendicular to the cráck-propagation path were applied at secondary locations to accentuate the magnitude of acceleration-deceleration observed in this specimen. The photoelastic data were analyzed using dynamic stress field equations in conjunction with the least-squares over-deterministic method to obtain the crack-propagation fracture toughness,K ID . Crack velocity, å, was determined numerically by differentiating a polynomial fitted to the crack length-time data in a leastsquares sense. Experimental results indicate that Homalite 100 does not exhibit significant hysteresis in theK ID -å relation. |
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