... deformations generated by defects resulting from irradiation. Such deformations were determined using atomic-scale (ab initio and empirical potential) calculations. According to our results, breakaway growth is strongly related to the vacancy diffusion anisotropy: in agreement with ab initio calculations...

... to initiate from the volumetric defects. However, the defect size in the R-B specimens is consistently smaller and, consequently, results in better fatigue resistance as compared to the axial specimens. Hence, special care needs to be taken during the specimen design to ensure that there is enough volume...

... by up to 98% as verified by CT scans. closed-loop control defect repair flaws defects lack of fusion laser powder based fusion (LPBF) in situ inspection in-process inspection surface profilometry additive manufacturing STRUCTURAL INTEGRITY OF ADDITIVE MANUFACTURED MATERIALS AND PARTS 1...

... metallic parts requires new approaches that more explicitly quantify the influence of the AM process on the quality of the part. For example, the AM process can, when not properly designed and controlled, create defects, such as porosity, lack of fusion, or severe surface roughness. If these defects occur...

... loading conditions is lacking. Fatigue performance is largely driven by defects in the material, such as porosity and surface roughness. AM process optimization often is completed through trial-and-error iterations misguided by average values to characterize defects that do not capture the fatigue...

... scatter was still found. Further analysis of fracture surfaces and cross sections are presented to explain the data scatter. fatigue Ti-64 additive microstructure defects HIPing hot isostatic pressing particle shedding FOURTH SYMPOSIUM ON FATIGUE AND FRACTURE OF METALLIC MEDICAL MATERIALS...

... describes the geometry and fracture behavior of pre-Northridge and of unreinforced post-Northridge WSMF connections. The origin, size, and geometry of the fracture initiating defects are discussed, as are the stresses and strains, and the materials at the fracture initiation sites. The factors needed...

.... Two case studies involving stone veneer systems are presented, outlining the problems found and the solutions used in remediation. stone veneer exterior wall travertine granite cladding condition survey defects liner blocks solutions expanding polyurethane foam remediation Joseph P...

... of idealizing the discontinuities as initial cracks were examined. weld ship design high-strength steel A710 steel HSLA-80 steel fatigue discontinuities cracks defects George R. Kober, I Robert J. Dexter, 2 Eric J. Kaufmann, 2 Ben T. Yen, 3 and John W. Fisher 3 THE EFFECT OF WELDING...

...-the-thickness splaying of the layers and numerous delaminations near the waviness, was the common failure mode. composite materials thermoplastics defects layer waviness compression failure fatigue life Daniel O'Hare A d a m s I and Michael W. Hyer 2 Effects of Layer Waviness on the Compression...

... Probabilistic failure theories have been developed for predicting the structural reliability of complex components subjected to conditions of multiaxial stress. Embodied in these theories are material failure characteristics which describe the statistical variation of defects within the volume...

... This paper describes work performed by Failure Analysis Associates, Inc. (FaAA) to develop capabilities for quantitative analysis and evaluation of parts containing defects. The work was conducted for Boeing Aerospace under the Astronautics Laboratory NDE Data Application Project (F04611-86-C...

... and defect designs for evaluating the overall stress/strain behavior of plain and welded plates. Furthermore, the performance requirements in relation to the purpose of the test are critically reviewed. Part III considers the present state of the art in heat-affected-zone wide-plate testing procedures...

... stress defects cracks notches toughness requirements test requirements Rudi M. Denys t Wide-Plate Testing of Weldments: Part l Wide-Plate Testing in Perspective REFERENCE: Denys, R. M., "Wide-Plate Testing of Weldments: Part 1--Wide-Plate Testing in Perspective," Fatigueand Fracture Testingof...

... testing crack-tip opening displacement (CTOD) Charpy V-notch impact test brittle fracture residual stress defects cracks notches toughness requirements high-strength steels Rudi M. Denys ~ Wide-Plate Testing of Weldments: Part II Wide-Plate Evaluation of Notch Toughness REFERENCE: Denys, R. M...

... The damage to optics from high power laser radiation depends in part upon the surface films on the system optics. Approaches to hardening these surfaces to these types of radiation have focused on layered film compositions and upon the reduction of structural defects in the films...

... Defect clusters in a commercial RPV material, generated by a series of four controlled irradiations in a test reactor, and their thermal evolution with different heat treatments were investigated by SANS, and the studies were completed by independent DENS experiments performed with a triple-axis...

... with the concentration of nitrogen atoms revealed that Cottrell locking is dominant over Snoek drag for the strain-rates used here. interstitial impurities embrittlement diffusion energy radiation aging ductility dislocation locking defects serrations STP1046-EB/May 1990 K. Linga Murty1 and Sheikh T...

... uniformity, epi/substrate transition width, and epi defect density. silicon epitaxy single wafer reactor uniformity autodoping defects edge crown McDonald Robinson and Lamonte H. Lawrence CHARACTERIZATION OF HIGH GROWTH RATE EPITAXIAL SILICON FROM A NEW SINGLE WAFER REACTOR REFERENCE: Robinson...

..., data on delamination depth are rarely available. However, it was found that by assuming a delamination interface that results in the lowest failure strain, correlation with test data was obtained. composite materials impact delamination defects buckling fracture mechanics laminates Gerry...