Abstract
A novel, simplified, method for evaluating theJ-integral for paper sheets has been developed. The inaccuracy of the single-specimen method (proposed by Riceet al. [8]), when applied to the fracture toughness testing of paper, was found to result from an erroneous assumption about the relationship between the load and the displacement due to plasticity. A new method was developed theoretically; it is based on a modified assumption about this relationship. Using this method, theJ-integral can be evaluated with a single load-displacement curve together with a new parameter that must be separately evaluated using at least one additional specimen. Although the new method requires a minimum of two notched specimens, it provides more flexibility than previous modifications of the single-specimen method. The experimental study indicated that the present method yields values ofJ c (the critical value of theJ-integral) which agree very closely with those obtained using the cumbersome multiple-specimen method, and is therefore more suitable for paper testing than other methods presently available.
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On leave from the Central Research Laboratory, Oji Paper Co. Ltd, 1-10-6 Shinonome, Koto-ku, Tokyo 135, Japan
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Yuhara, T., Kortschot, M.T. A simplified determination of theJ-integral for paper. J Mater Sci 28, 3571–3580 (1993). https://doi.org/10.1007/BF01159839
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DOI: https://doi.org/10.1007/BF01159839