... To enable monitoring of graphite that has been exposed to irradiated, high-temperature environments, there is a need for analysis methods that are suitable for fracture toughness measurements in small test specimens. Quasistatic fracture propagation has been studied for two candidate graphites...

... The strength of advanced graphite is reported in accordance with ASTM D7846-16 using a two-parameter Weibull distribution for uniaxial strength testing. The rule of thumb for Weibull distributions is to use a minimum of 30 strength measurements to have a high level of confidence in the Weibull...

... Coefficient of thermal expansion (CTE) gives a key insight into the thermomechanical properties of a material, representing the dimensional expansion of a material for a given temperature change. It is of particular relevance to graphite components within reactors, providing insight...

... Gas permeability describes the rate at which gases can pass through a material under pressure-driven flow. It is a property of interest for graphite components within gas-cooled reactors, indicating the level of permeation of cooling gases within the components and hence the rate of reaction...

... Postirradiation examination (PIE) of graphite samples trepanned from the UK reactor cores has been carried out for more than 50 years. Due to the nature of the material, there are sample size and geometry restrictions and no standard test methods to cover measurements on this material...

... Test methods used to characterize the properties of petroleum coke, pitch, carbon artifacts (anodes and cathodes), and manufactured carbon products and graphite are presented in this chapter. This includes the raw materials and artifacts used in the electrolytic production of aluminum as well...

... One of the key issues that must be addressed when a sampling and measurement program underwrites the performance of full-size graphite components is the understanding of the influence of material type and specimen size on the measured property. Because of sampling constraints, specimen sizes...

... has been limited for nuclear graphite primarily by the sizes of particles and intrinsic defects in the as-fabricated materials in relation with the critical dimensions of the test specimens, in particular, for mechanical properties. However, this is often no longer the case for the more recent...

... Design codes and fitness-for-service protocols have recognized the need to characterize the tensile strength of graphite as a random variable through the use of probability density functions. Characterizing probability density functions require more tests than typically needed to simply define...

... The ASTM Standard C769-09 covers a procedure for measuring the sonic velocity in manufactured carbon and graphite which can then be used to obtain Young’s modulus. There are four main assumptions in this standard that require further investigation (i) homogeneity and isotropy of the tested...

... The HTV capsule is a High Flux Isotope Reactor (HFIR) target-rod capsule designed to operate at very high temperatures. The graphite containing section of the capsule (in core) is approximately 18 in. (457.2 mm) long and is separated into eight temperature zones. The specimen diameters within...

... Understanding the effects of radiation on nuclear grade graphite requires complex experiment design with specific specimen geometries. These geometries are not always optimal for the various testing and measurement standards used to characterize the graphite before and after irradiation...

... The non-linear elastic behavior of a series of pitch-based graphite fibers was studied using the method of laser generated ultrasound. A Q-switched Nd-YAG laser was used to produce pulses which generated stress waves in the fibers. The velocity of the acoustic wave was determined from the time...

... in a fission reactor. Effects of neutron irradiation on the swelling of the materials were determined and presented. Thermal diffusivity data on the irradiated materials are not presented neutron irradiation carbon-boron-titanium compounds thermal diffusivity hot press HIP TiB 2 TiC graphite...

... This paper reports the results of an experimental study on the compressive, time-dependent behavior of fiber-reinforced polymer composite laminates with open holes. The effect of loading rate on compressive strength was determined for six graphite/matrix material systems ranging from brittle...

... Expanding mandrel (Simulated Fuel Expansion or Simfex) pellet-cladding interaction (PCI) simulation tests were performed on unirradiated Zircaloy-2, Zircaloy-4, zirconium-lined Zircaloy-2, Zircaloy-3A alloy-lined Zircaloy-2, and graphite-lined Zircaloy-4 tubing with high-purity argon and iodine...

... nickel-base alloys duplex stainless steels titanium graphite austenitic stainless steels corrosion potential polarization current coupling active-passive regions Narasi Sridhar^ and Juri Kolts^ Evaluation and Prediction of Galvanic Corrosion in Oxidizing Solutions REFERENCE: Sridhar, N...

..., toughness, creep, and fatigue) of relevance to structures operating in power generation equipment are then developed in quantitative terms. ferritic and stainless steels graphite uranium dioxide concrete relationship between mechanical properties and microstructure Peter Marshall Development...

... of its chemical structure, lignin turned into paracrystalline coal, a precursor graphite. In the natural process of carbonization, different kinds of coals such as lignite, bituminous coal, anthracite, or even graphite are formed. TG proved suitable for characterizing these coals by proximate analysis...

... A standard quality-control test method for determining the fiber strength of graphitized roving has been developed. Methods analyzed were (1) single filament, (2) dry strand between joints, and (3) impregnated roving. The single-filament test is currently the only test routinely employed...