..., the time to crack initiation under constant load has been predicted using a strain-based failure criterion. Finite element analysis of the CT specimen revealed that, due to the strong localization of inelastic strain at the void, a microcrack will initiate in the vicinity of the void rather than...

... to simulate ductile crack growth in fracture specimens and to predict the burst pressure of thin-walled tubular structures containing crack-like defects. ductile fracture crack growth finite elements R -curve pipelines burst pressure crack-tip constraint Claudio Ruggieri I and Eduardo Hippert...

... in a specialized finite-element software, using small crack increments. At each crack propagation step, the mesh is automatically redefined based on a self-adaptive strategy that takes into account the estimation of the previous step stress analysis numerical errors. Numerical methods are used to calculate...

... algorithm is implemented as a user-subroutine in the commercial finite-element method package ABAQUS. The results of a numerical analysis of the rotation of an aircraft turbine disk are presented. Cyclic loading conditions are studied, and the results are compared with numerical results in the literature...

... available information for through cracks in infinite sheets. The semi-infinite results are obtained in closed form and are based on the differences in stored strain energy of an uncracked pipe and a pipe with a slit running its full length. Finite element computations are used to provide results for two...

... appears to be quite promising. fracture mechanics finite elements adhesive joints peel stresses special adhesive elements David A. Dillard, 1 Mark W. Taylor, 2. Raul Andruet, 2 and Siegfried M. Holzer 3 Simple Two- and Three-Dimension Adhesive Finite Elements for Stress Analysis and Energy...

... by a nonlinear finite element method that incorporated the constitutive equations and the damage accumulation criteria. The predictions of the model were compared with the available experimental data for laminates with and without a cutout. Overall, the predictions agreed with the data quite well...

... Elastic-plastic finite-element analyses were used to calculate stresses and displacements around a crack in finite-thickness plates for an elastic-perfectly plastic material. Middle- and edge-crack specimens were analyzed under tension and bending loads. Specimens were 1.25 to 20 mm thick...

... the influence of ductile crack extension prior to cleavage. Ductile crack extensions of 10–15 · the crack-tip opening displacement at initiation are considered in plane-strain, finite element computations. The finite element results demonstrate a significant elevation in crack-tip constraint due to macroscopic...

... to a brittle fracture mode after some amount of ductile tearing. ductile fracture cleavage fracture fracture toughness crack growth stress triaxiality constraint finite elements Noel P. O'Dowd I C. Fong S h i h 2 a n d Robert H. Dodds, Jr. 3 The Role of Geometry and Crack Growth on Constraint...

... advancing the crack. The void-free material surrounding the cells is described by the J 2 flow theory of plasticity. The two cell parameters, D and f 0 , characterize the mean spacing and volume fraction of voids in the material lying in the plane of fracture. Finite element calculations have been...

... stresses are similar in both simulations. ductile fracture cleavage fracture gurson model damage finite elements Ronald W.J. Koers 1, Atfons H.M. Krom 2, and Ad Bakker 3 PREDICTION OF CLEAVAGE FRACTURE IN THE BRITTLE TO DUCTILE TRANSITION REGION OF A FERRITIC STEEL REF]~CE: Koers, R. W. J...

... and simulated service conditions. Finite element modeling is employed to develop relations between bending moments applied to the wheel during cornering maneuvers and peak stress excursions in the wheel spider. Cyclic material properties for candidate materials (high-strength steel and aluminum), that include...

... Many laws have been proposed for the failure of brittle materials. These divide into two main categories — volume and surface integrals. To evaluate these for a complex body requires an initial finite element analysis followed by postprocessing to evaluate the integrals. How this can be achieved...

... for the calculation of stress-intensity factors is demonstrated by comparison with three-dimensional finite element fracture mechanics results and empirically estimated values. Prediction of fatigue crack growth in girth welds and tubular connections is compared with observations of cracking in large-scale test...

... This paper presents an evaluation of the three-dimensional finite-element models and methods used to analyze surface cracks at stress concentrations. Previous finite-element models used by Raju and Newman for surface and corner cracks at holes were shown to have “ill-shaped” elements...

... During fatigue crack propagation in sufficiently thin metallic sheets, shear lips develop which spread throughout the material thickness. This leads to a situation where, in addition to a Mode I component of deformation, there is also a Mode III component. Finite-element calculations are carried...

... The authors have developed a finite-element program with constant-strain capabilities that can handle cyclic loading. The constitutive relation is considered to be elastic-viscoplastic incorporating the Bodner-Partom flow rule. Incalloy 718 is the alloy considered at a temperature of 670°C...

... A unique dynamic delamination buckling and delamination propagation analysis capability has been developed and incorporated into a finite-element computer program. This capability consists of (1) a modification of the direct time integration solution sequence which provides a new analysis...

... plane strain, finite element model was modified to predict stress states at the laminate interior and free edges. Finite element results demonstrated that the weave geometry reduces edge stresses at low temperatures. Delamination edge stresses in woven laminates are more sensitive to small changes...