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Abstract
The dislocation distribution function in the plastic zone at a crack tip is calculated with the help of a modified BCS-type crack model. It is found that opposite sign dislocations appear on the slip plane immediately ahead of the crack tip. These negative dislocations seem to enter the crack tip and blunt it, resulting in a dislocation-free zone at the crack tip. The image force theory of the formation of dislocation-free zone is discussed.
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LONG QI-WEI,

XIONG LIANG-YUE

1.
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Cited By

[1]	Li Lian-He, Liu Guan-Ting.A screw dislocation interacting with a wedge-shaped crack in one-dimensional hexagonal quasicrystals. Acta Physica Sinica, 2012, 61(8): 086103.doi:10.7498/aps.61.086103
[2]	GE TING-SUI.NONLINEAR ANELASTIC INTERNAL FRICTION PEAKS ASSOCIATED WITH DISLOCATION CORE DIFFUSION. Acta Physica Sinica, 1996, 45(6): 1016-1025.doi:10.7498/aps.45.1016
[3]	ZHAO QING-LAN, GUAN TIE-TANG.BORRMANN IMAGE OF DISLOCATION IN THE CRYSTAL OF THALLIUM ACID PHTHALATE. Acta Physica Sinica, 1993, 42(4): 626-630.doi:10.7498/aps.42.626
[4]	Yang Shun-hua, Li Guo-wang, Huang Jun-ping.MOVING DISLOCATION IN TWO PHASE MEDIUM. Acta Physica Sinica, 1991, 40(5): 771-780.doi:10.7498/aps.40.771
[5]	YANG SHUN-HUA, HU XIAO-FENG, MA RU-ZHANG.THE ELASTIC PROPERTIES OF A DISLOCATION IN TWO PHASE MEDIUM. Acta Physica Sinica, 1989, 38(9): 1483-1491.doi:10.7498/aps.38.1483
[6]	SUN ZONG-QI, HAN MING-HUI.DISCRETE ELASTIC MODEL FOR CRYSTAL DISLOCATION——CORE STRUCTURE AND P-N FORCE. Acta Physica Sinica, 1989, 38(2): 183-192.doi:10.7498/aps.38.183
[7]	GAO FEI, ZHANG HONG-TU.THE APPLICATION OF DISLOCATION GAUGE FIELD FOR THE DISLOCATION CORE. Acta Physica Sinica, 1989, 38(7): 1127-1133.doi:10.7498/aps.38.1127
[8]	GAO FEI, ZHANG HONG-TU.PILE-UP OF DISLOCATION WHILE EXISTING INHOMOGENEITY. Acta Physica Sinica, 1988, 37(8): 1315-1325.doi:10.7498/aps.37.1315
[9]	CHEN JIN-CHANG, HUANG YI-SEN, WEI PEI-ZAI.DISLOCATIONS IN POTASSIUM DIHYDROGEN PHOSPHATE (KDP) CRYSTALS. Acta Physica Sinica, 1985, 34(3): 377-380.doi:10.7498/aps.34.377
[10]	LONG QI-WEI, WANG LI.THE IMAGE FORCE ON THE DISLOCATION NEAR A CRACK TIP. Acta Physica Sinica, 1984, 33(9): 1337-1340.doi:10.7498/aps.33.1337
[11]	GUO CHANG-LIN.DISLOCATIONS IN α-SILICON CARBIDE SINGLE CRYSTAL. Acta Physica Sinica, 1982, 31(11): 1511-1525.doi:10.7498/aps.31.1511
[12]	GE CHUAN-ZHEN, XU XIU-YING, FENG DUAN.THE NEEDLE-LIKE STRESS ZONES AND DISLOCATIONS DUE TO CONSTITUTIONAL SUPERCOOLING IN CZOCHRALSKI METHOD-GROWN YAG SINGLE CRYSTALS. Acta Physica Sinica, 1981, 30(2): 218-223.doi:10.7498/aps.30.218
[13]	LIU ZHEN-MAO, WANG GUI-HUA.A DISLOCATION SOURCE IN THE FLOAT-ZONE GROWN SILICON SINGLE CRYSTALS. Acta Physica Sinica, 1980, 29(9): 1164-1179.doi:10.7498/aps.29.1164
[14]	YANG CHUAN-ZHENG, JIANG XIAO-LONG, XU SHUN-SHENG.X-RAY TOPOGRAPHIC STUDY OF DISLOCATIONS AND STACKING FAULTS IN SILICON WEB DENDRITES. Acta Physica Sinica, 1980, 29(3): 341-353.doi:10.7498/aps.29.341
[15]	GUO KE-XIN, LIN BAO-JUN.MOVEMENT AND INTERACTIONS OF DISLOCATIONS IN NICKEL-CHROMIUM ALLOYS. Acta Physica Sinica, 1978, 27(6): 729-745.doi:10.7498/aps.27.729
[16]	LIU CHEN-MAO, WANG KWEI-HUA, HUNG CHING, YEH I-CHENG.THE EXPERIMENTAL OBSERVATION OF DISLOCATION MULTIPLICATION IN SILICON CRYSTALS. Acta Physica Sinica, 1966, 22(9): 1077-1097.doi:10.7498/aps.22.1077
[17]	HSIN HSIU-SAN.THE FORMATION OF DISLOCATION LOOPS BY VACANCY CONDENSATION. Acta Physica Sinica, 1966, 22(5): 541-546.doi:10.7498/aps.22.541
[18]	HUNG CHING, YEH E-CHENG.VELOCITY OF DISLOCATIONS IN SILICON CRYSTALS. Acta Physica Sinica, 1965, 21(12): 1968-1976.doi:10.7498/aps.21.1968
[19]	FONG DUAN, MING NAY-BEN, LI CHI.A STUDY OF ETCH-FIGURES OF DISLOCATION LINES IN MOLYBDENUM CRYSTALS. Acta Physica Sinica, 1964, 20(4): 337-351.doi:10.7498/aps.20.337
[20]	.ИССЛЕДОВАВНЕ ДИСЛОКАЦИОННОГО МЕХАНИЗМА СКОЛЬЖЕНИЯ В КРИСТАЛЛАХ. Acta Physica Sinica, 1960, 16(4): 229-240.doi:10.7498/aps.16.229

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Vol. 33, Issue 6 - 1984-03-20

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