THE OPPOSITE SIGN DISLOCATIONS AT A CRACK TIP AND THE IMAGE FORCE THEORY OF DISLOCATION-FREE ZONE

LONG QI-WEI; XIONG LIANG-YUE

doi:10.7498/aps.33.755

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.
Authors and contacts
LONG QI-WEI,

XIONG LIANG-YUE

1.
中国科学院金属研究所
References

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[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
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[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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THE OPPOSITE SIGN DISLOCATIONS AT A CRACK TIP AND THE IMAGE FORCE THEORY OF DISLOCATION-FREE ZONE

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THE OPPOSITE SIGN DISLOCATIONS AT A CRACK TIP AND THE IMAGE FORCE THEORY OF DISLOCATION-FREE ZONE

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