用双扭方法研究岩石的断裂韧性
DETERMINATION OF FRACTURE TOUGHNESS OF GABBRO BY DOUBLE TORSIONAL METHOD
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摘要: 本实验用双扭技术测量了济南辉长岩的断裂韧性.在干、湿及垂直向位移恒定的条件下,用双扭松弛方法测定裂纹的扩展速度 V.得到了与 Atkinson [1]类似的结果.济南辉长岩的断裂韧性为:KIC=2.810.03MNm-3/2.本文提出了 Spetzler[2] 和 Atkinson 关于在湿条件下亚临界裂纹扩展机制的不同看法.由声发射的实验结果看出,声发射率与应力强度因子的关系呈现了与 K1——V 曲线类似的趋势.Abstract: The stress intensity of Jinan gabbro was measured by using the double torsional method. The crack velocities V were also observed from the load relaxation at constant crosshed displacement under dry and wet conditions. The results obtained are similar to that of Atkinson's.The fracture toughness of gabbro was found to be 2.81 0.03 MNm-3/2 A view different from that of Spetzler and Atkinson on the mechanism of the subcritical crack growth under wet condition has been proposed.The relation between acoustic emission rate and the stress intensity is nearly the same as those of V vs K1 from results of acoustic emission experiment.
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[20] B. K. Atkinson, Int. J. Rock, Mech. Min. Sci&Geomcch Ab}tr, 16, 49——53, 1979
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[25] B. J. Pletka, E. R. Fuller. .Jr. B. G. Koepkc, ASTM. STP 678,19——37,1979.[1] H. Spetzler, A. model for time——dependent rock failure, 1981(讲演稿).
[2] B. K. Atkinson and R. D. Rawlings, Acoustic emission on during Sub}eritical tensilo cracking of gabhro and granite, Ahstract AGU meeting, May 1979, Washington, EOS, 60, 740, 1979.
[3] P. L. Swanson, Stress corrosion cracking in Wcsterl granite: An examination by the double torsin teahuique MSC thesis, U. Colorado 142, 1980.
[4] H. Spetzler,C. Sondergeld. and C. Getting, the influence of Stran rato and moisture content on rock .failure, Proc :iVIIth Assembly IUGG Canberra. Australia. 1979.
[5] H. Mizutani, H. Spetzler, I. Geffing, R. Marfin, J. III and N. Sofia, Proe 8th lunar, Sci. Conf, 1235——1248, 1977.
[6] N. Sofia. H. Spctzler and H. Mizutani, Proc 10th Lunar, Sci. Conf, 2165——2173, 1979.
[7] R A. Schmidt and J. T. Lutz, ASTM. STP.678,167,1979.
[8] F. F. Lunge, In fracture mechanics of ceramics 1, 3——15. Edited by R. C. Braet. D. P. H. Has selman and F.F.Lange, 1914.
[9] B. J. S. Willkiua and L. A. Simpson, Journal of the American Caramics Sociaty, 57, 11, 500,1974.
[10] S. Peng and A. M. Johnson, Crack growth and faulting in cylindrical specinens of Chalmsford granite. Int. J. Rock Mech. Min. Sci.& Geom ech Abstra, 9, 37——86, 1974.
[11] R. J. Clifton, E. R. Simons. A. H. Jones and S. J. Green. Expl Meeh, 16,233——238,1976.
[12] R. A. Schmidt, Fracture——toughness testing of limestone. Expl. Meck., 16. 161——167, 1976.
[13] J. P. Henry and J. Pa.quet, Mecanique de la ruptwe de ruches calcitigues, Bull. Soc. geol. Fr, 18, 1573——1582, 1976.
[14] R. A. Schmidt andC. W. Haddle, Int. J. Rock Mech Min. Sci, & Geomech Abstr. 14, 289——293,1977.
[15] R. F. Pafsh, In Fracture Mechanics of Ceranticy, Edited iyR.C. Bradt. D. P. H. Hassohman and F. F. Lange, 2,555——565,Plenum Press——New York,1974.
[16] L. A. Sintpson. In fracture mechanics of ceramics. Edited by R. C. Bradt, D. P. H. Hasselman and F F. Lange, 2. 567——577, 1976.
[17] J. O. Out.iwater and D. J. Gery, On the fracture energy—— of glass. NRL Interim Contract Report Contract NoNR 3219(01)(X). A. D. 640848.University of Vermont Burliugton Vt Aag 1966.
[18] D. P.Williantn and A. G, Evans. Journal of Testing and EvaLuat.ion, 1 4. 264——270, 1973.
[19] A. G. Evaus, Journal of Material Sc.ionce, 7, 10, 1137——1146, 1972.
[20] B. K. Atkinson, Int. J. Rock, Mech. Min. Sci&Geomcch Ab}tr, 16, 49——53, 1979
[21] R. B. Winter, Bestemntung der Bruchzahigkeit and Spezifischen Oberf lachenenergie you Cres——feinen in Dreipunkt——Bisgevepsuch Dipslomarqeit Ruhr——Iinivcreityat Rochant, 1979.
[22] 陈颙、姚孝新、耿乃光,中国科学,11, 1093——1100, 1979.
[23] E. R. Jr. Fuller, ASTM STP, 678, 3——18, 1979.
[24] F. P. Champomier ASTM. STP, 678, 60——72, 1979.
[25] B. J. Pletka, E. R. Fuller. .Jr. B. G. Koepkc, ASTM. STP 678,19——37,1979. -
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