Abstract
To characterize fracture toughness of thin plates or local positions in weld joints, a new fracture toughness test method is proposed. A small round bar with a circumferential notch is tensile-tested, and a load-displacement curve is recorded. J-integral is calculated continuously from a load start point to obtain a blunting line empirically. The critical J is determined at the fracture point on the blunting line. Some specimens show remarkable necking, and others fracture at or near the maximum load. Since necking generates a large plastic flow and cup & cone fracture, a flow diagram to evaluate the critical fracture toughness is assessed by adding some limitations. A comparison of results by this new method with ASTM E813-89 is performed, and both methods reveal nearly equivalent toughness value.
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References
ASTM E813–89. Standard test method for Jic, a measure of fracture toughness, Annual book of ASTM standards, American Society for Testing and Materials, Philadelphia (1991).
Y.A. Rosenthal, R.L. Tobler, and P.T. Purtscher, Jib data analysis methods with a negative crack growth correction procedure, J. Test. Eval., 18: 301 (1990).
A. Nyilas and B. Obst, A new test method for characterizing low temperature structural materials, Adv. Cryo. Eng., 42: 353 (1996).
T. Ogata, K. Ishikawa, T. Yuri, R.L. Tobler, P.T. Purtscher, R.P. Reed, T. Shoji, K. Nakano, and H. Takahashi, Effects of specimen size, side-grooving, and precracking temperature on J-integral test results for AISI 316LN at 4 K, Adv. Cryo. Eng., 34: 259 (1988).
J.R. Rice, P.C. Paris, and J.G. Merkle, Some further results of J-integral analysis and estimates, in: “ASTM Special Technical Publications 536,” (1973) p. 231.
Y.Z. Itoh, T. Murakami, and H. Kashiwaya, Approximate formulae for estimating the.1-integral of a circumferentially cracked round bar under tension or torsion, Eng. Frac. Mech., 31: 967 (1988).
A. Nishimura, R.L. Tobler, H. Tamura, S. Imagawa, T. Mito, J. Yamamoto, O. Motojima, H. Takahashi, S. Suzuki, Fracture toughness of partially welded joints of SUS316 stainless steel at 4 K by large bend-bar tests, IEEE Trans. on Magnetics, 32: 2941 (1996).
A Nyilas, B. Obst, and D.R. Harries, Mechanical investigations on aged stainless steel and Incoloy 908 materials at 4–7 K, Paper will be presented at Adv. Cryo. Eng. (Materials), AC3, ICMC at Portland, USA, July 1997.
A. Nishimura, J. Yamamoto, O. Motojima, J.W. Chan, J.W. Morris, Jr., R.L. Tobler, H. Takahashi, and S. Suzuki, Fracture toughness of partially welded joints of SUS316 in high magnetic field at 4 K, Adv. Cryo. Eng., 42: 315 (1996).
A. Nyilas, B. Obst, and A. Nishimura, Fracture mechanical investigations of on aged and aged structural materials with EDM-notched round bars at 7 K, Paper will be presented at Adv. Cryo. Eng. (Materials), HC3, ICMC at Portland, USA, July 1997.
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Nishimura, A., Yamamoto, J., Nyilas, A. (1998). Fracture Toughness Evaluation of a Round Bar with a Circumferential Notch at Cryogenic Temperature. In: Balachandran, U.B., Gubser, D.G., Hartwig, K.T., Reed, R.P., Warnes, W.H., Bardos, V.A. (eds) Advances in Cryogenic Engineering Materials . Advances in Cryogenic Engineering, vol 44. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9056-6_19
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DOI: https://doi.org/10.1007/978-1-4757-9056-6_19
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