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eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2023
ISBN: 978-0-8031-7733-8
... the strength of whole-specimen configurations. machine learning fatigue mechanical properties microstructure porosity damage very high cycle fatigue hybrid manufacturing heat-affected zone machining forging 262 ADVANCES IN ACCELERATED TESTING AND PREDICTIVE METHODS IN CREEP, FATIGUE...
eBook Chapter
... 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...
eBook Chapter
... commonly seen in oxidation results. Suggestions for improving oxidation standards are made with the hopes of broadening the range of applications and maximizing its utility. nuclear graphite microstructure porosity oxidation kinetics GRAPHITE TESTING FOR NUCLEAR APPLICATIONS: THE VALIDITY...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2020
ISBN: 978-0-8031-7708-6
... Fatigue cracks grow from pores at the surface of components that were produced by laser powder bed fusion (LPBF). In AlSi10Mg components produced by LPBF, large oxides apparently interfere with consolidation of powder into the melt pool, contributing to part porosity; the oxides may also...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2020
ISBN: 978-0-8031-7708-6
.../contamination in the powder feedstock can be detected in the witness specimen. A series of Ti6Al4V witness specimens with varying porosity distributions are presented, which were part of a previous study of builds of the same set of parts on different laser powder bed fusion systems. This demonstrates how...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2020
ISBN: 978-0-8031-7708-6
...% porosity, while at 0% porosity, it increased from 118 kJ to 419.1 kJ as the strain rate was increased from 10 to 1,000/s. However, at 10% porosity, honeycomb of intermediate slenderness ratio (i.e., 1.0) exhibited the largest energy absorption to the order of 258 kJ at the strain rate of 1,000/s...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2020
ISBN: 978-0-8031-7686-7
... 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...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2019
ISBN: 978-0-8031-7659-1
... will be utilized to identify a preferred preparation method for adoption as standard practice. thermal barrier coatings metallographic preparation sectioning mounting polishing porosity characterization image analysis 100 YEARS OF E04 DEVELOPMENT OF METALLOGRAPHY STANDARDS 21 STP 1607, 2019...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2018
ISBN: 978-0-8031-7641-6
... oxide. High-angle annular dark-field scanning transmission electron microscopy also revealed the development of extensive networks of intergranular porosity and eventually grain decohesion in the reactor-formed oxides. These results suggest that the tetragonal-monoclinic transformation...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2012
ISBN: 978-0-8031-7537-2
... for situations in which a clogged placement is encountered. pervious concrete infiltration rate permeability porosity Heather J. Brown1 and Alan Sparkman2 Pervious Concrete STP 1551, 2012 Available online at www.astm.org DOI:10.1520/STP20120019 The Development, Implementation, and Use of ASTM C1701...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2010
ISBN: 978-0-8031-3419-5
..., respectively. The air void parameters of the concrete are measured with air void analyzer, Rapid Air, and porosity (ASTM C642) tests. The results indicate that although concrete made with a low w/b (≤0.35) has low rapid chloride permeability (≤1320 C), it generally still requires proper air entrainment...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2006
ISBN-10: 0-8031-3408-8
ISBN: 978-0-8031-3408-9
... of the reflection coefficients are influenced by the depth dependence of the porosity and the density. First, the relationships between the frequency characteristics of the reflection coefficients and the porosity variation with the depth are theoretically shown using Ocean Acoustics and Seismic Exploration...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2004
ISBN-10: 0-8031-3471-1
ISBN: 978-0-8031-3471-3
... interconnectivity. A range of techniques has been examined in relation to key measurements such as pore size and porosity. Since capillary flow porometry measures a pore solely at its most constricted point, the method is unable to provide characterisation of other aspects of the pore. Scanning Electron Microscopy...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2000
ISBN-10: 0-8031-2870-3
ISBN: 978-0-8031-2870-5
... in solvent cast, particulate-leached templates can radically change cellular attachment behavior. absorbable porogen porosity tissue engineering Karen J. L. Burg, l Catherine E. Austin,2 and Jeanene P. Swiggett2 Modulation of Pore Topography of Tissue Engineering Constructs Reference: Burg, K. J...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2000
ISBN-10: 0-8031-2624-7
ISBN: 978-0-8031-2624-4
...), strength, and porosity. It has been speculated that the fatigue properties of aluminum castings are dominated by the propagation of cracks which initiate from microshrinkage pores ranging in size from ∼ 10 to 1000 μm. A model was developed that calculates fatigue life based on small crack growth rates...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2000
ISBN-10: 0-8031-2875-4
ISBN: 978-0-8031-2875-0
... of various test properties as a guide to durability. Within this review, recommendations demonstrating how these tests may be specified in UK practice are also given. durability frost damage limestone petrography porosity salt crystallization stone cladding specification testing Bruno F...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2000
ISBN-10: 0-8031-2869-X
ISBN: 978-0-8031-2869-9
... The porosity of twenty-two fabric samples was evaluated using image analysis. The relationship between the optical porosity and vapor penetration was investigated using a permeation test apparatus. A model was derived based on Whelan's equation for the resistance of fabric to diffusion of vapor...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1999
ISBN-10: 0-8031-2493-7
ISBN: 978-0-8031-2493-6
... particles larger than 2.38 mm. However, for particles smaller than 2.38 mm the agreement decreases with decreasing particle size. helium pycnometry automated testing aggregate specific gravity apparent specific gravity bulk specific gravity porosity Stanley J. Vitton~, Michael A. Lehman2...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1999
ISBN-10: 0-8031-2493-7
ISBN: 978-0-8031-2493-6
... between formation factor (F), porosity (n), and cementation factor (m) of remolded sand-cement specimens. This relationship is shown to provide a mechanism for estimating the level of cementation in undisturbed specimens. The formation factor is the ratio of the electrical resistivity of the sand-water...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1998
ISBN-10: 0-8031-2421-X
ISBN: 978-0-8031-2421-9
... normally not detected by microscopic or macroscopic methods. This ultrasonic technique also can be used to map and measure other defects as porosities at the billet stage with a precision previously not attainable. Additionally, a development of conventional step-down testing can be used to enhance...