Dynamic crack bifurcation in pmma
WebNote that only the micro-cracks that form far enough away from the main crack tip subsequently grow into a macroscopic branch, while those close to the main crack tip … WebMay 16, 2024 · dynamic two cracks bifurcation. In the present work, this method is extended for simulation of the multiple crack branching phenomena. The cracks are modeled by the Delaunay Automatic triangulation for each time step. Using this crack modeling technique the moving singularities at the
Dynamic crack bifurcation in pmma
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WebSep 19, 2024 · The U.S. Department of Energy's Office of Scientific and Technical Information WebIn this study the effect of the position of the layer within the geometry is studied. Of particular interest are dynamic crack deflection, bifurcation and penetration mechanisms across …
WebPolymethyl methacrylate (PMMA) is one of important engineering materials and has been widely applied in various fields. Owing to the catastrophically brittle fracture nature, exploring the fracture mechanism of PMMA is of crucial significance to guide its engineering application. In this work, tensile tests with several kinds of sample geometries including … WebNov 22, 2016 · Static experiments related to rapid crack bifurcation are conducted with PMMA plate specimens with Y-shaped notches. The bifurcation angle of the Y-shaped notch is changed from zero to 45...
WebA finite volume/cohesive zone formulation was used to model micro-crack nucleation and dynamic interaction in the process zone. The cohesive strength and fracture resistance were estimated from unnotched tensile tests and the application of LEFM to the notch test data. Even though a very simple criterion was used to govern the insertion and ... WebNov 1, 2006 · Request PDF Dynamic crack bifurcation in PMMA An investigation of the branching characteristics of small PMMA single edge notched tensile (SENT) specimens …
WebAn investigation of the branching characteristics of small PMMA single edge notched tensile (SENT) specimens is presented. The influence of notch depth and s...
WebNov 1, 2006 · In the paper, the stress intensity factor (SIF) for an axial crack in a polymethyl methacrylate (PMMA) cylindrical shell is studied using the optical caustic … novel less than zeroWebDec 1, 2024 · The existing dynamic phase-field model for brittle PMMA reveals that bifurcation places an upper limit on the crack propagation velocity ( Rabczuk et al., 2009, Tian et al., 2024b ). This fact implies that the limit crack velocity is insensitive to loading once crack bifurcation occurs, which will also be strengthened in the next section. novellen theodor stormWebSep 5, 2006 · The problem of dynamic symmetric branching of an initial single brittle crack propagating at a given speed under plane loading conditions is studied within a continuum mechanics approach. Griffith's energy criterion and the principle of local symmetry are used to determine the cracks paths. The bifurcation is predicted at a given critical speed and … novelle electric fireplaceWebA finite volume/cohesive zone formulation was used to model micro-crack nucleation and dynamic interaction in the process zone. The cohesive strength and fracture resistance … novellen witcherWebOct 22, 2024 · In order to study the dynamic crack propagation law in fissured rock under the different fillings, a borehole with 7 mm diameter was processed in the center of a polymethyl methacrylate (PMMA) specimen. novelle nails carefreeWebOct 22, 2024 · When the stress strength exceeds the dynamic tensile strength of PMMA, the wing cracks begin to initiate and propagate. In the crack propagation process, the … novell groupwise 6.5 isoWebIn order to validate the numerical simulation results, experiments by using PMMA (polymethyl methacrylate) with a crack and a borehole were carried out. The charge structure and incident angle of the blasting experimental model were the same as those in the numerical models. ... “Dynamic crack bifurcation in PMMA,” Engineering Fracture ... novellen thomas mann