The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
L I Slepyan - One of the best experts on this subject based on the ideXlab platform.
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Brittle Fracture in a periodic structure with internal potential energy spontaneous crack propagation
Proceedings of The Royal Society A: Mathematical Physical and Engineering Sciences, 2014Co-Authors: M V Ayzenbergstepanenko, Gennady Mishuris, L I SlepyanAbstract:Ayzenberg-Stepanenko, M., Mishuris, G., Slepyan, L. (2014). Brittle Fracture in a periodic structure with internal potential energy. Spontaneous crack propagation. Proceedings of the Royal Society A: Mathematical, Physical & Engineering Sciences, 470 (2167), [20140121].
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Brittle Fracture in a periodic structure with internal potential energy spontaneous crack propagation
arXiv: Soft Condensed Matter, 2014Co-Authors: M V Ayzenbergstepanenko, Gennady Mishuris, L I SlepyanAbstract:Spontaneous Brittle Fracture is studied based on the recently introduced model (Mishuris and Slepyan, Brittle Fracture in a periodic structure with internal potential energy. Proc. Roy. Soc. A, in press). A periodic structure is considered, where only the prospective crack-path layer is specified as a discrete set of alternating initially stretched and compressed bonds. A bridged crack destroying initially stretched bonds may propagate under a certain level of the internal energy without external sources. The general analytical solution with the crack speed $-$ energy relation is presented in terms of the crack-related dynamic Green's function. For the anisotropic two-line chain and lattice considered earlier in quasi-statics, the dynamic problem is examined in detail. The crack speed is found to grow unboundedly as the energy approaches its upper limit. It is revealed that the spontaneous Fracture can occur in the form of a pure bridged, partially bridged or fully open crack depending on the internal energy level. Generally, the steady-state mode of the crack propagation is found to be realised, whereas an irregular growth, clustering and the crack speed oscillations are detected in a vicinity of the lower bound of the energy.
Dhiraj K Mahajan - One of the best experts on this subject based on the ideXlab platform.
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role of stress triaxiality on ductile versus Brittle Fracture in pre cracked fcc single crystals an atomistic study
Modelling and Simulation in Materials Science and Engineering, 2019Co-Authors: Rajwinder Singh, Dhiraj K MahajanAbstract:The ductile versus Brittle Fracture in crystalline materials depends on the relative values of K Ic and K Ie as defined by well-known Rice theory, where K Ic and K Ie are the critical values of stress intensity factor corresponding to cleavage and dislocation emission, respectively. For K Ic < K Ie , the Brittle Fracture (or cleavage) takes place in atomically sharp pre-cracked crystal subjected to Mode I loading. For K Ie < K IC , the dislocations are emitted from the crack front resulting in ductile Fracture. To this end, molecular static simulations are used to explain the crystal orientation dependent Fracture behaviour of FCC single crystal and its contradiction with respect to Rice theory based on stress triaxiality at the crack front. The stress triaxiality at crack front changes with crystal orientation due to transformation of stiffness tensor C ijkl . It is shown that high stress triaxiality suppressed the dislocation initiation leading to cleavage failure even for the case when K Ie < K Ic .
Rajwinder Singh - One of the best experts on this subject based on the ideXlab platform.
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role of stress triaxiality on ductile versus Brittle Fracture in pre cracked fcc single crystals an atomistic study
Modelling and Simulation in Materials Science and Engineering, 2019Co-Authors: Rajwinder Singh, Dhiraj K MahajanAbstract:The ductile versus Brittle Fracture in crystalline materials depends on the relative values of K Ic and K Ie as defined by well-known Rice theory, where K Ic and K Ie are the critical values of stress intensity factor corresponding to cleavage and dislocation emission, respectively. For K Ic < K Ie , the Brittle Fracture (or cleavage) takes place in atomically sharp pre-cracked crystal subjected to Mode I loading. For K Ie < K IC , the dislocations are emitted from the crack front resulting in ductile Fracture. To this end, molecular static simulations are used to explain the crystal orientation dependent Fracture behaviour of FCC single crystal and its contradiction with respect to Rice theory based on stress triaxiality at the crack front. The stress triaxiality at crack front changes with crystal orientation due to transformation of stiffness tensor C ijkl . It is shown that high stress triaxiality suppressed the dislocation initiation leading to cleavage failure even for the case when K Ie < K Ic .
M V Ayzenbergstepanenko - One of the best experts on this subject based on the ideXlab platform.
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Brittle Fracture in a periodic structure with internal potential energy spontaneous crack propagation
Proceedings of The Royal Society A: Mathematical Physical and Engineering Sciences, 2014Co-Authors: M V Ayzenbergstepanenko, Gennady Mishuris, L I SlepyanAbstract:Ayzenberg-Stepanenko, M., Mishuris, G., Slepyan, L. (2014). Brittle Fracture in a periodic structure with internal potential energy. Spontaneous crack propagation. Proceedings of the Royal Society A: Mathematical, Physical & Engineering Sciences, 470 (2167), [20140121].
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Brittle Fracture in a periodic structure with internal potential energy spontaneous crack propagation
arXiv: Soft Condensed Matter, 2014Co-Authors: M V Ayzenbergstepanenko, Gennady Mishuris, L I SlepyanAbstract:Spontaneous Brittle Fracture is studied based on the recently introduced model (Mishuris and Slepyan, Brittle Fracture in a periodic structure with internal potential energy. Proc. Roy. Soc. A, in press). A periodic structure is considered, where only the prospective crack-path layer is specified as a discrete set of alternating initially stretched and compressed bonds. A bridged crack destroying initially stretched bonds may propagate under a certain level of the internal energy without external sources. The general analytical solution with the crack speed $-$ energy relation is presented in terms of the crack-related dynamic Green's function. For the anisotropic two-line chain and lattice considered earlier in quasi-statics, the dynamic problem is examined in detail. The crack speed is found to grow unboundedly as the energy approaches its upper limit. It is revealed that the spontaneous Fracture can occur in the form of a pure bridged, partially bridged or fully open crack depending on the internal energy level. Generally, the steady-state mode of the crack propagation is found to be realised, whereas an irregular growth, clustering and the crack speed oscillations are detected in a vicinity of the lower bound of the energy.
Keiichi Yamamoto - One of the best experts on this subject based on the ideXlab platform.
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ductile crack as trigger of Brittle Fracture in steel
Journal of Structural Engineering-asce, 1997Co-Authors: Hitoshi Kuwamura, Keiichi YamamotoAbstract:Brittle Fracture of structural steel members in buildings is generally triggered by a ductile crack initiated at a notched surface after undergoing a noticeable amount of plastic strain, as evidenced by structural damage in Kobe during the 1995 Hyogoken-Nanbu earthquake, as well as by large-scale Fracture testing in laboratory. This study, based on Fracture experiments and finite-element analyses, showed the conditions governing the initiation of such a ductile crack in conjunction with notch sharpness, material properties, and specimen size. Major findings are as follows. Ductile cracking is governed by three physical parameters, that is, averaged plastic strain in a notched section, peak stress triaxiality under the notch root, and uniform strain capacity pertinent to the material, in such a way that the strain at the onset of a ductile crack increases with the reduction in stress triaxiality and with the increase in uniform strain capacity. Their relations are established in an empirical formula. It is...