Dynamic Crack Propagation
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Study of cracks in concrete target under deep penetration by a projectile
Abstract A large number of cracks occur in concrete structure after projectile penetration. The study of crack distribution and propagation process is the basis of damage assessment, structural repair and high dynamic fracture mechanism. In this paper, wire saw cutting, X-ray computed tomography (X-CT) and mechanical property testing of damaged concrete were
Lat. Am. j. solids struct.. Publicado em: 14/03/2019
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2. Experimental Study of Fatigue Crack Behavior of Rib-To-Rib Butt Welded Connections in Orthotropic Steel Decks
Abstract Rib-to-rib (RR) butt welded connections are one of the most sensitive locations for encountering fatigue failure in orthotropic steel decks (OSDs), and numerous fatigue cracks arising from these areas have been identified in existing OSD bridges. Due to dynamic factors in their service life bridges with an orthotropic steel deck (OSD) are prone to f
Lat. Am. j. solids struct.. Publicado em: 11/10/2018
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3. Dynamic crack propagation of granite subjected to biaxial confining pressure and blast loading
Abstract To great understanding the dynamic crack propagation of rock under in-situ stress and blasting, the static-dynamic loading experimental platform was built. With different confining pressure (0MPa, 2MPa, 4MPa, 6MPa, 8MPa) and different ratios (K) of horizontal-to-vertical pressure (0, 0.25, 0.5, 0.75, 1), nine texts have been carried out in quadrate
Lat. Am. j. solids struct.. Publicado em: 02/07/2018
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4. Laboratory study of dynamic mechanical characteristic of granite subjected to confining pressure and cyclic blast loading
Abstract To investigate the deformation characteristic of deep rock under cyclic blasting, the static-dynamic loading experimental equipment was set up. The dynamic strain gauges and high-speed (HS) camera were adopted to obtain strain field and the crack propagation of rock under confining pressure of 0 MPa, 5 MPa and 10 MPa. Under the one-time loading fro
Lat. Am. j. solids struct.. Publicado em: 28/06/2018
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5. Analysis of parameters effects on crack breathing and propagation in shaft of rotor dynamic systems
In this paper the design of experiment method is used to investigate and explain the effects of the rotor parameters on crack breathing and propagation in the shaft. Three factors are considered which have an influence on the behavior and the propagation of the crack: the rotational speed, the length of the rotor and the diameter of the shaft. The elaborated
Mat. Res.. Publicado em: 28/05/2013
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6. PARALLEL TOPOLOGICAL SUPPORT FOR FINITE ELEMENT MESHES IN DYNAMIC FRACTURE AND FRAGMENTATION ANALYSES / SUPORTE TOPOLÓGICO EM PARALELO PARA MALHAS DE ELEMENTOS FINITOS EM ANÁLISES DINÂMICAS DE FRATURA E FRAGMENTAÇÃO
Fracture propagation and fragmentation phenomena in solids can be described by Cohesive Zone Models and simulated with the Finite Element Method. Among the computational approaches of recent interest for fracture representation in finite element meshes are those based on cohesive elements. In those approaches, fracture behavior is represented by cohesive ele
Publicado em: 2011
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7. FADIGA EM ESTRUTURAS METÁLICAS TUBULARES SOLDADAS
Circular and rectangular hollow sections are used extensively in the field of the construction and mechanical engineering in all types of structures, such as offshore platforms, towers of communication, fluid conductors, bridges, footbridges and others, under different types of loading. These structures when submitted to cyclical loads, although in situation
Publicado em: 2008
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8. Sobre metodologias de modelagem computacional de propagação de trincas por fadiga em fuselagens aeronáuticas. / On computacional modeling methodologies of fatigue crack propagation in aircraft fuselages.
A methodology for modeling fatigue crack growth in pressurized, stiffened, thin shell structures is implemented within a software framework that consists of a fracture simulation code associated with a finite element analysis code. Crack trajetories are allowed to be arbitrary and are computed incrementally as a part of the simulation. Trajectories are repre
Publicado em: 2007
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9. Application of intrinsic cohesive models for simulation of dynamic crack propagation. / Aplicação de modelos coesivos intrínsecos na simulação da propagação dinâmica de fraturas.
Os fenômenos estudados pela Mecânica da Fratura podem ser observados na própria Natureza, em sistemas de altíssimo padrão tecnológico, bem como em estruturas mais tradicionais. Dessa forma, os engenheiros devem estar alerta para investigar a variedade de mecanismos complexos, relacionados aos processos de fratura, que podem surgir nesses sistemas. Ness
Publicado em: 2007
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10. Avaliation of cracking process in concrete beams considering dinamics aspects / Avaliação do processo de ruptura em vigas de concreto considerando os aspectos dinâmicos
The concrete is a quasibrittle and heterogeneous material. These attributes are favourable to arise cracks that could propagate with time in a loaded structures. Some advances of the fracture mechanics theory applied to concrete have been already achieved. Nowadays, there are three basics models of constitutive diagrams used to simulate the concrete behaviou
Publicado em: 2006
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11. Oxygen-induced intergranular fracture of the nickel-base alloy IN718 during mechanical loading at high temperatures
There is a transition in the mechanical-failure behavior of nickel-base superalloys from ductile transgranular crack propagation to time-dependent intergranular fracture when the temperature exceeds about 600 °C. This transition is due to oxygen diffusion into the stress field ahead of the crack tip sufficient to cause brittle decohesion of the grain bounda
Materials Research. Publicado em: 2004-03