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  • 1
    Electronic Resource
    Electronic Resource
    Acetone Absorption in Irradiated Polycarbonate (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 5751-5757 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00121a009
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  • 2
    Electronic Resource
    Electronic Resource
    Hardness of irradiated poly(methyl methacrylate) at elevated temperatures (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 1745-1749 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The decrease in hardness induced by gamma irradiation in poly(methyl methacrylate) (PMMA) has been investigated. The hardness is assumed to decrease linearly with the concentration of radiation-induced defects. Annealing at high temperatures induces defect annihilation as tracked by an increase in hardness. The annihilation follows first-order kinetics during isothermal annealing. The dependence of hardness on the reciprocal of the time constant satisfies the Arrhenius equation, and the corresponding activation energy of the kinetic process decreases with increasing dose. The hardness of postannealed PMMA decreases linearly with increasing dose. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1388573
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  • 3
    Electronic Resource
    Electronic Resource
    The elastic interaction between a moving screw dislocation and a crack (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2164-2166 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the elastic interaction between a moving screw dislocation and a crack. The stress intensity factor at the crack tip decreases with the increasing velocity of the screw dislocation. This implies that the shielding effect of the moving screw dislocation on crack propagation is reduced. The image force on the moving screw dislocation arising from the crack surface decreases with the increasing velocity of the screw dislocation itself. Finally, Newton's third law is not valid in the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352346
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of superdislocation on fracture: Dislocation-free zone in the front of a semi-infinite crack tip (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2209-2214 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of superdislocation on mode II or mode III fracture has been investigated. The plastic zone between a semi-infinite crack tip and a superdislocation with a dislocation-free zone is simulated by a continuous dislocation distribution. The dislocation distribution functions in the crack and plastic zone are analytically derived. A close form of the number of dislocations in the plastic zone and stress field along the x axis are obtained. From the stress field, the stress intensity factor KIII at the crack tip and stress concentration at the superdislocation are available. When the distance between crack tip and superdislocation is larger than the plastic zone size, the stress intensity factor is proportional to the square root of plastic zone size KIII, but is inversely proportional to the distance between crack tip and superdislocation. On the other hand, when the distance between crack tip and superdislocation is almost the same as the plastic zone size, the stress intensity factor is inversely proportional to the square root of distance between crack tip and superdislocation. It is also found that the applied stress is determined by the superdislocation. Finally, our results can be reduced to several special cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351613
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  • 5
    Electronic Resource
    Electronic Resource
    Theory for the rate of crack closure (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 212-216 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The theory for the constant rate of crack closure was investigated. The aim of this theory is to explain why the rate of crack closure is constant during the wetting stage of healing. Assuming that a surface crack in a material is treated by compression or with solvent, its crack closes up at a constant rate and its shape is independent of time. This approach was based on the Gibbs energy of an atom near the boundary between healed and unhealed zones. The results are in satisfactory agreement with experimental data in the literature. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360654
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  • 6
    Electronic Resource
    Electronic Resource
    An edge dislocation near a macrocrack with a microcrack (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 6079-6087 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The elastic interaction between an edge dislocation and a macrocrack with a microcrack has been investigated by means of the Muskhelishvili potential method. The stress and displacement fields were obtained. From the stress field, we derived the stress intensity factor at each crack tip and the image force on the dislocation. The effects of the distance between two cracks on the crack shielding and of the image force on the edge dislocation were examined. The effects of the microcrack length on the shielding of the macrocrack and of the image force of the dislocation were also considered. The dislocations in the microcrack play an important role in fracture. Two conditions, an edge dislocation emitting from the microcrack and originating from elsewhere, are discussed. We compare the mechanical behavior between edge and screw dislocations near the macrocrack with the microcrack. Newton's third law is satisfied for this system. Two special cases are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355192
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  • 7
    Electronic Resource
    Electronic Resource
    Diffusion-induced stresses in a long bar of square cross section (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 3211-3219 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The diffusion-induced stresses in a long bar of square cross section have been investigated. Two mass transfers consisting of constant average concentration and constant surface concentration were considered. The concentration distribution was obtained in an analytic form. The displacement and stress fields were obtained numerically using a Jacobi iterative method. The maximum stress is located at the corner for constant average concentration and at the midedge for constant surface concentration. A comparison of stresses built up in the bar of a square cross section and in a thin slab was made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352965
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of chemical stresses on diffusion (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2823-2829 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of chemical stresses on diffusion has been investigated. A thin plate of isotropic material with boundary conditions of constant surface chemical potential and constant surface stresses is considered. If there is no rotation in the isotropic solid, the effective diffusivity arising from the chemical stresses is proportional to the concentration. The chemical stresses enhance the mass transfer because of increasing diffusivity. The initial surface concentration may differ from the final surface concentration for the constant surface chemical potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356174
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  • 9
    Electronic Resource
    Electronic Resource
    Image force and shielding effects of a moving edge dislocation near a semi-infinite crack (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 4869-4877 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The image force and shielding effects of a moving edge dislocation near a semi-infinite crack were investigated. The crack surface was simulated by continuous dislocations. After the dislocation distribution in the crack was obtained, the stress field in the entire space was calculated. Based on the stress field, the stress intensity factor and crack extension force on the crack tip, and the image force on the edge dislocation were computed. The crack shielding or antishielding arising from the edge dislocation slip or climb was studied in detail. The transition velocity of changing behavior of edge dislocation and Lorentz force were discussed. Newton's third law was invalid in the system of moving edge dislocation and crack.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353803
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  • 10
    Electronic Resource
    Electronic Resource
    Interaction of an edge dislocation with a wedge crack (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4873-4880 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The elastic interaction of an edge dislocation with a wedge crack is investigated using Muskhelishvili's complex potential treatment of elasticity. The stress intensity factors induced by the dislocation, the strain energy, and the image force acting on the dislocation are formulated, calculated, and plotted. Especially, the influence of wedge angle on the shielding effects and on image forces is investigated. The results show that the radial component of the image force is inversely proportional to the distance from the crack tip to the dislocation and the tangential image force increases with increasing wedge angle as the dislocation position is kept unchanged. When the slip plane passes the crack tip, whether the edge dislocation shields or antishields the crack tip depends on its Burgers vector. In this case, the slip plane of the edge dislocation of Burgers vector b1+ib2=beiθmax inclined at an angle θmax with respect to the positive real axis corresponding to the maximum mode I crack shielding increases slightly to a maximum and then decreases with increasing wedge angle. Regardless of wedge angle, the maximum mode II shielding (or anti-shielding) occurs when the dislocation is located at the positive real axis. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359775
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