Unconventional behavior of edge dislocations in a plane shock‐stress field

1976 ◽  
Vol 47 (1) ◽  
pp. 22-23
Author(s):  
Ching H. Ma
Keyword(s):  
Stress Field ◽  
Plane Shock ◽  
Edge Dislocations ◽  
Shock Stress

Dislocation damping in a shock stress field

1973 ◽  
Vol 7 (11) ◽  
pp. xxiii-xxiv
Author(s):  
Ching H. Ma
Keyword(s):  
Stress Field ◽  
Shock Stress

Diffraction of a Pressure Wave by a Cylindrical Cavity in an Elastic Medium

1961 ◽  
Vol 28 (3) ◽  
pp. 347-354 ◽  
Author(s):  
M. L. Baron ◽  
A. T. Matthews
Keyword(s):  
Shock Wave ◽  
Stress Field ◽  
Cylindrical Cavity ◽  
Hoop Stress ◽  
Integral Transform ◽  
Time History ◽  
Plane Shock ◽  
Influence Coefficients ◽  
History Of ◽  
Stress Concentration Factors

An infinitely long cylindrical cavity in an infinite elastic homogeneous and isotropic medium is enveloped by a plane shock wave whose front is parallel to the axis of the cavity. An integral transform technique is used to determine the stress field produced in the medium by the diffraction of the incoming shock wave by the cavity. Expressions for the radial stress σrr, the hoop stress σθθ, and the shear stress σrθ are derived as inversion integrals, and numerical results are presented for the time-history of the hoop stress σθθ at the boundary of the cavity. The amplifications of the hoop-stress concentration factors due to the dynamic loading are noted. The problem is considered for pressure waves with a step distribution in time. These results may be used as influence coefficients to determine, by means of Duhamel integrals, the stress field produced by waves with time-varying pressures.

Computer Simulation of Core Structure and Stress Field of Edge Dislocations in C60Crystals Using Girifalco Potential

1998 ◽  
Vol 37 (Part 1, No. 11) ◽  
pp. 6115-6116 ◽  
Author(s):  
Shigeru Tamaki ◽  
Naoki Ide ◽  
Isamu Okada ◽  
Kenichi Kojima
Keyword(s):  
Computer Simulation ◽  
Stress Field ◽  
Core Structure ◽  
Edge Dislocations

Dislocation damping in a shock stress field

1974 ◽  
Vol 22 (6) ◽  
pp. 675-676 ◽  
Author(s):  
Ching H Ma
Keyword(s):  
Stress Field ◽  
Shock Stress

Photographs of the Stress Field Around Edge Dislocations

1956 ◽  
Vol 101 (3) ◽  
pp. 1211-1211 ◽  
Author(s):  
W. L. Bond ◽  
J. Andrus
Keyword(s):  
Stress Field ◽  
Edge Dislocations

scholarly journals Crystal Dislocations and Coercivity in Fine Grained Magnetite

1967 ◽  
Vol 20 (5) ◽  
pp. 507 ◽  
Author(s):  
FD Stacey ◽  
KN Wise
Keyword(s):  
Grain Size ◽  
Domain Wall ◽  
Stress Field ◽  
Potential Well ◽  
Oriented Edge ◽  
Screw Dislocations ◽  
Fine Grained ◽  
Ferromagnetic Domain ◽  
Edge Dislocations ◽  
Ferromagnetic Domain Wall

Interaction of the stress field of a favourably oriented edge dislocation with the magnetostriction in a ferromagnetic domain wall in magnetite causes the dislocation to act as a potential well for the domain wall. The coercivity of 20 pm. grains, in which the domain structure is considered to be particularly simple, can be explained on this basis if the dislocations are arranged so that the effects of several of them are additive. The required density of edge dislocations is 109 cm-2, which is entirely reasonable; screw dislocations are not effective in magnetite. To explain the variation of coercivity with grain size it appears necessary to assume that the arrangement of dislocations is neither regular nor random but is partially ordered.

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