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. 1992 Sep-Oct;97(5):579–607. doi: 10.6028/jres.097.026

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 12 — Fracture toughness for the ZAC as measured by the single-edge precracked beam (SEPB) method. The rate dependence of fracture toughness probably is a consequence of R-curve and environmentally assisted crack growth phenomena.