six wide-plate crack-arrest tests (wp-2 series) are discussed in this report. each test utilized either a 1 x 1 x 0.1-m or a 1 x 1 x 0.15-m thick single-edge notch specimen (a/w = 0.2), fabricated from a low-upper-shelf base material, that was subjected to a linear thermal gradient along the plane of crack propagation. the tests were conducted at the national institute of standards and technology and were designed ...
the first pressurized-thermal-shock test of a 148-mm-thick steel pressure vessel with a 1-m-long flaw was performed to investigate fracture behavior of a vessel under conditions relevant to a flawed nuclear reactor pressure vessel during an overcooling accident. the objectives were to observe crack arrest and stability on the ductile upper shelf and the effects of warm prestressing on crack initiation. three coordinated pressure and thermal transients were imposed on the ...
The Galerkin-finite element approximation to the Navier-Stokes equations is developed from the continuous conservation laws governing the time-dependent flow of a viscous incompressible fluid. A computer code implementing the approach is described and results from several example problems are discussed. Biquadratic Lagrangian isoparametric elements are used to discretize the velocities. Bilinear elements discretize the pressure unknown. The nonlinear problem that results from the convection term in the Navier-Stokes equations is ...
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