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Makuteswara Srinivasan

Makuteswara Srinivasan
Materials Matter, U.S.A.

Ph.D.

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33
Publications
377
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238
Citations

Publications

Publications (33)
Article
Graphitizations at temperatures greater than 2700 • C are generally preferable for nuclear graphite manufacture in order to obtain higher order of graphitization and lattice density. In 1993, Brocklehurst and Kelly published data showing graphitization temperature played a significant role on the dimensional change behavior (DCB) of pile grade A (P...
Article
Successful deployment of graphite in 21st century nuclear reactors depends on the rigor and quality of communication between the component designer and manufacturer. For construction in the U.S., a thorough understanding of meeting the regulatory requirements, ASME International graphite component design and construction code requirements, and ASTM...
Article
Literature on the changes in the specimen dimensions and volume after high energy neutron irradiation of more than a dozen graphites were examined. Some of these data have been previously used to design graphite components in gas cooled reactors. The dimensional change behavior of a graphite is rather unique and depends on both the irradiation temp...
Article
For nuclear reactor designs there is general recognition of the impracticality to directly test materials and components to determine their properties, which affect their performance. It becomes necessary therefore to determine design-significant physical, thermal, and mechanical properties from small specimens of the same material, representative...
Article
Hertzian fracture tests were conducted on sintered α-silicon carbide, partially-stabilized zirconia and other ceramics by using tungsten carbide spherical indenters. The influence of the indenter diameter, specimen surface conditions, and loading rates on the fracture strengths are discussed. The Weibull statistical treatment of brittle fracture se...
Chapter
The notch root configuration in machining notches for single-edge notched beam specimens and the corresponding ambiguities in the measured Klc values were evaluated by using different notching procedures, namely ultrasonic and diamond machining. A variety of ceramics were examined with notch widths varying from 0.25 to 0.76 mm. The need for precrac...
Chapter
It is well recognized that surface and near-surface flaws control the strength of the majority of specimens from a population of sintered alpha silicon-carbide test bars. An investigation was carried out to examine the applicability of surface acoustic wave techniques (SAW) to detect two-dimensional Knoop-indented surface cracks in this material. T...
Chapter
SummaryA comprehensive computer program to simulate the three-dimensional microstructure of particulate-and whisker-reinforced composites and the crack particulate interactions has been developed. Although only the crack deflection aspects are considered at present to evaluate fracture toughness increments, other toughening models can be incorporat...
Chapter
enamel;electrolytic-pretreatment (EP);electroplating;oxidation;zero-carbon base
Chapter
High frequency, bulk-wave ultrasonics detected defects in manufactured SiC components. In addition, gas-turbine blades and vanes were examined by scanning laser acoustic microscopy (SLAM). Comparative results obtained on simple shapes such as disks and bars by microfocus X-ray radiography, ultrasonics, scanning photoacoustic spectroscopy, and SLAM...
Article
An attempt to apply three-dimensional flaw models to characterize fracture origins in sintered alpha silicon carbide is made. Some general improvements in the intrinsic flaw fractography results are obtained by using three-dimensional void models instead of two-dimensional crack models.
Article
The thermoluminescent properties of LiF (TLD-100) have been investigated as a function of plastic deformation. Without exposure to ionizing radiation, plastic deformation up to fracture does not induce a thermoluminescent response. After subsequent exposure to ionizing radiation, the intensity of the thermoluminescent glow peaks decreases with the...
Chapter
The advanced ceramics of yesteryear, specifically the non-oxide materials, have become fully commercialized in several applications where long life, improved performance, unique design capability and cost advantages have been explicitly utilized. Exploiting the advantages of their unique properties combined with the availability of complex shapes,...
Article
Corrosion rates of single phase α-SiC and reaction-sintered SiC containing 8-13 wt.% free silicon are measured by DC polarization measurements in HCl, HNO3, H3PO4, and aqua regia.
Article
SiC/TiB2 composites have been exposed to aqua regia solution for 200 h, to 50% aqueous NaOH, and to 10% HF/57% HNO3/H2O solution for up to 500 h at room temperature.
Article
A silicon carbide composite containing titanium diboride particulate reinforcement was subjected to room-temperature acidic corrosion in aqua regia solutions for 200 h, and 50% NaOH+50% H2O and 10% HF+57% HNO3+33% H2O solutions for up to 500 h. A small increase in room-temperature strength was observed after the aqua regia exposure. Separately, thi...
Article
Quality assurance of ceramic components during various processing stages is an important ingredient in assuring the reliability in engineering applications. The current advances which are made in advanced nondestructive evaluation of finished components have been very useful. However, the importance of in-process quality control in closed-loop iter...
Article
The non-lubricated wear behavior of Al//2O//3, PSZ, and two grades of sintered alpha SiC has been studied under unidirectional sliding conditions at room temperature. Using a ring on ring geometry, the wear rates were established as a function of normal load and sliding time. Mechanistic understanding is explored by extensive microscopy and profilo...
Article
A method to obtain the two and three Weibull parameters from the statistical strength distribution of ceramics, when either surface flaws or volumetric flaws govern fracture, is outlined. The advantages of obtaining confidence in the parameter estimates are given realizing the flaw severity variations within a test population. The inadequacy of tes...
Article
The objective of the present paper was to discuss the surface chemistry and the tribological properties of sintered polycrystalline and single crystal alpha SiC at elevated temperatures. Tribological studies and X-ray photoelectron spectroscopy analyses were conducted with sintered polycrystalline and single-crystal SiC flat surfaces in sliding con...
Article
High frequency, bulk-wave ultrasonics detected defects in manufactured SiC components. In addition, gas-turbine blades and vanes were examined by scanning laser acoustic microscopy (SLAM). Comparative results obtained on simple shapes such as disks and bars by microfocus X-ray radiography, ultrasonics, scanning photoacoustic spectroscopy, and SLAM...
Article
The temperature dependence of flexural strength of two engineering structural ceramics - single-phase sintered alpha silicon carbide and two-phase fine grain reaction-bonded silicon carbide - are examined. Using Weibull statistics, the risk of rupture for various stress levels has been derived from flexural versus tensile strength relationships. Ce...
Article
The photoacoustic phase signatures of closed cracks are calculated and compared with experimental observations. The differential signals from near subsurface lateral cracks are advanced in phase by 45° with respect to the background signal, in contrast to the 45° lag in phase observed for a near lower surface step.
Article
The difficulties in applying existing dynamic and static fatigue theories to model the slow crack growth behaviour of silicon carbide ceramics are examined critically. The assumptions that the geometric parameter,Y, in the fracture mechanics relation remains unchanged for all flaws during crack growth and that the final crack size is much larger th...
Article
An analysis has been developed for obtaining tensile strength distribution parameters from expanded ring flexure tests by considering the non-uniform stress distribution which occurs in the test. It is shown that expanded ring flexure strengths overestimate the tensile strength by approximately 5 to 10%.
Article
Description This volume emphasized the use of current fracture mechanics models to understand the failure of important engineering materials such as concrete, SiC, Si3N4 and Si-Al-O-N's.
Article
Flexural strength of sintered alpha silicon carbide was measured from room temperature to 1600 degree C in both air and argon atmospheres. Excellent high temperature strength retention was observed. Failure analysis performed on broken test bars revealed that voids, and weakly-bonded regions were the processing-related critical defects causing fail...
Conference Paper
The oxidation behavior of sintered alpha SiC is parabolic at 1200/sup 0/C, 1350/sup 0/C and during the initial stages at 1500/sup 0/C. Parabolic rate constants have been calculated and show values lower than for hot pressed SiC but consistant with other forms of sintered SiC. Time dependent failure does occur in sintered alpha SiC in air at tempert...
Article
The geometry of the process of plastic deformation is investigated in high purity single crystals of LiF and MgO. Of the four slip planes in the NaCl structure which are equally stressed when the specimen is loaded along a 〈100〉 direction, it is shown that MgO shows a preference for slip along a plane with a long slip path in a rectangular specimen...

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