... content that primarily includes graphite filler, graphitized pitch binder, and voids/defects that typically occupy approximately 20% of the volume. Among these microstructural components, porosity and microcracking (considered to be part of voids/defects) heavily influence the overall properties...

... So far the interaction of microcracks with microstructural elements like grain boundaries or phase boundaries is described qualitatively well by the models of Tanaka and Navarro and De Los Rios. However, an experimentally verified quantitative description is missing due to a lack of systematic...

... The effect of chemical composition on microstructure and mechanical properties was investigated. Optimum contents of Al and N for appropriate prior austenite grain size were determined to avoid the formation of microcracks during oil quenching after a carbonitriding heat treatment...

... transverse tensile stresses. In this work, use is first made of a phenomenological approach that models the response of homogeneous materials that have a large number of possible microcrack planes with different orientations in space. Densities of cracks of similar orientation can be treated as internal...

... the process of failure in concrete under increasing stress levels as influenced by latex modification. These results were indicative of the effectiveness of latex in controlling the initiation and growth of microcracks under load. Test results on the impact resistance and flexural strength and toughness...

... mechanics mechanical properties microcracks microscopy short cracks small cracks test methods James M. Larsen, 1 Jay R. Jira, ~ and Kakkaveri S. Ravichandran I Measurement of Small Cracks by Photomicroscopy: Experiments and Analysis REFERENCE: Larsen, J. M., Jira, J. R., and Ravichandran, K. S...

... microcracks, both at ambient and elevated temperatures. In addition, the stereoimaging technique has been used to measure crack-tip parameters that characterize the mechanics and driving force for small fatigue cracks. cracks microcracks measurements scanning electron microscope crack-tip mechanics...

... to the measurement of closure, crack shape, and to automation of small-crack testing. automation crack propagation displacements fatigue materials fracture mechanics interferometry lasers mechanical properties microcracks short cracks small cracks test methods William N. Sharpe, Jr., 1 Jay R...

... microcracks short cracks small cracks test methods James M. Larsen,^ James C. Williams,^ and Anthony W. Thompson^ Crack-Closure Effects on the Growth of Small Surface Cracks in Titanium-Aluminum Alloys REFERENCE: Larsen, J. M., Williams, J. C., and Thompson, A. W., "Crack-Closure Effects on the Growth...

... were concluded to be the primary features contributing to crack closure. crack closure crack propagation fatigue (materials) fracture mechanics mechanical properties minicomputers microcracks short cracks small cracks surface cracks test methods titanium alloys Jay R. Jira,^ Tusit...

... by hydrogen, without measuring the thickness of material tested. ultrasonic testing wave velocity hydrogen attack Young's modulus shear modulus Poisson's ratio carbon steel low alloy steel decarburization microcracks nondestructive tests Takeharu Watanabe, 1 Yuzo Hasegawa, 1and Kazumasa...

... An electrochemical technique is described that images and quantitatively measures the distribution and severity of fatigue damage. The technique is based upon ( 1 ) the creation of microcracks in a surface anodic oxide film during fatigue of the underlying metal, and ( 2 ) the detection...

... describing the mechanical behavior of investigated rocks was suggested for complicated conditions of impact rock spalling. granite limestone basalt graywacke Hopkinson split bar test stress pulse fracture damage spalling microcracks specific surface energy crack propagation Jaroslav Buchar...

... Theoretical limits for maximum and minimum temperature gradients within which microcracks occur in cellular concrete were established. Specimens of concrete were subjected to temperature cycling in four temperature ranges. Experimentally obtained maximum and minimum temperature gradients were...

... Previous work established that tensile stress cycling of fibrous glass reinforced resin composites degrades their macroscopic mechanical properties by inducing microcracks in the cross-linked glassy polymer matrix. While the greatest damage occurs in the first stress cycle, it continues...

... The fatigue phenomenon can be described as a sequence of four phases: (1) crack nucleation, (2) microcrack propagation, (3) macrocrack propagation, and (4) final failure. The last phase is not discussed. Technical problems related to the other phases are indicated. The continuum mechanics...