Zobrazeno 1 - 10
of 82
pro vyhledávání: '"J. Eftis"'
Publikováno v:
International Journal of Plasticity. 19:1321-1354
A set of constitutive-microdamage equations are presented that can model shock compression and the microdamage and fracture that can evolve following hypervelocity impact. The equations are appropriate for polycrystalline metals. For impact at a proj
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3513f51f6a607a2873ad3a8be8d7496e
https://doi.org/10.1016/s0749-6419(02)00036-0
https://doi.org/10.1016/s0749-6419(02)00036-0
Publikováno v:
International Journal of Impact Engineering. 26:157-168
The material damage and fracture of Aluminum 1100 target plates that experience hypervelocity impact by glass projectiles traveling at 6 km/s are simulated using a proposed constitutive-microdamage material model. The model is best suited for polycry
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5e0e611e8e527436793cf8f1ec9a8e2c
https://doi.org/10.1016/s0734-743x(01)00078-1
https://doi.org/10.1016/s0734-743x(01)00078-1
Autor:
J.A. Nemes, J. Eftis
Publikováno v:
International Journal of Plasticity. 9:243-270
A recently developed viscoplastic-damage type of constitutive theory for high strain-rate flow processes and ductile fracture is used to model the deformation and fracture of dynamically loaded smooth cylindrical tensile bars. The analysis assumes po
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a23ff535d586eff158b5ab5c762b1ccc
https://doi.org/10.1016/0749-6419(93)90031-k
https://doi.org/10.1016/0749-6419(93)90031-k
Autor:
James Nemes, J. Eftis
Publikováno v:
International Journal of Fracture. 53:301-324
The ductile spall fracture and post-spall behavior of a circular target plate after impact with a flyer plate having small diameter, is modeled by means of a viscoplastic constitutive theory that includes the microvoid volume fraction as a scalar mat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::abcd8df55bfd457dffc9a86f3a5c39fb
https://doi.org/10.1007/bf00034179
https://doi.org/10.1007/bf00034179
Autor:
J.A. Nemes, J. Eftis
Publikováno v:
International Journal of Plasticity. 8:185-207
A model to predict material damage and spall fracture is applied to low-angle oblique plate-impact experiments. In this configuration, impact of parallel plates occurs along a direction inclined relative to the flyer velocity direction, resulting in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::24e7316f3d9cd828cffcef37727f1a16
https://doi.org/10.1016/0749-6419(92)90013-3
https://doi.org/10.1016/0749-6419(92)90013-3
Autor:
J. Eftis, J.A. Nemes
Publikováno v:
Computers & Structures. 38:317-328
A viscoplastic constitutive theory that contains a scalar variable description of damage is applied to a two-dimensional axisymmetric analysis of plate-impact spallation. The model uses the Perzyna viscoplastic constitutive formulation with inclusion
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::df79de571eb1fd6be71a7bd58456808a
https://doi.org/10.1016/0045-7949(91)90109-y
https://doi.org/10.1016/0045-7949(91)90109-y
Publikováno v:
International Journal of Plasticity. 7:15-39
A model to predict material damage and spall fracture under high strain-rate conditions is applied to plate impact experiments. The model uses the Perzyna viscoplastic constitutive theory, appropriately modified to include a nonlinear isotropic harde
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a1c6b8caee7a1239a2502513c0968880
https://doi.org/10.1016/0749-6419(91)90003-h
https://doi.org/10.1016/0749-6419(91)90003-h
Autor:
J. Eftis, J.A. Nemes
Publikováno v:
International Journal of Plasticity. 7:275-293
A mathematical model for the rate of growth of microvoids under mean tensile stress in dynamic processes is developed, which represents an extension of previous analysis of ductile void growth rates using the hollow sphere model. A viscoplastic mater
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8bc010d0c4e11c4c023b733cde248afa
https://doi.org/10.1016/0749-6419(91)90036-x
https://doi.org/10.1016/0749-6419(91)90036-x
Publikováno v:
Journal of Applied Mechanics. 57:282-291
The Perzyna viscoplastic constitutive theory, which contains a scalar variable for description of material damage, is used to study material behavior at high strain rates. The damage parameter for materials which undergo ductile fracture by nucleatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::743dc9a5678122826c9437561633b7ed
https://doi.org/10.1115/1.2891986
https://doi.org/10.1115/1.2891986
Publikováno v:
Journal of Engineering Materials and Technology. 112:188-197
The titanium alloy Ti-6Al-4V is known to exhibit creep behavior at temperatures as low as room temperature. Consequently, for cyclic loading with hold times it is possible that the rate dependent behavior of Ti-6Al-4V can have negative bearing upon t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::91bd2ad90b777a2427bc92e0d7ac020f
https://doi.org/10.1115/1.2903306
https://doi.org/10.1115/1.2903306