... thermal stability and oxidation standards ASTM E2550 and ASTM E1858 to produce a varnish. Qualitative analysis of the varnish layers was then performed by ASTM E1252 using infrared spectroscopy, and the in-service lubricant chemistry was evaluated using ASTM D7418. varnish degradation oxidation...

..., an array of lubricant additives was tested against these ASTM standards to understand the additive's thermal stability and chemical behavior toward extreme temperature excursions. The results of this testing program are reported. additive decomposition degradation lubricant oxidation...

... failures can result in undue air and moisture transfer across the building envelope, a loss of energy efficiency, and, given moisture ingress to the building envelope, the degradation of materials and components therein. To avoid serious degradation of building components and possible damage...

... A considerable amount of expensive polyamide 12 material remains unjoined in selective laser sintering (SLS) additive manufacturing. Such materials, particularly the ones near the heat-affected zones, go through irreversible chemical degradations originated from thermal oxidations. In the SLS...

... Tributyltin compound (TBT) released into the aquatic environment is generally degraded by bacteria in water and sediment. The isolation of TBT-degrading bacteria from TBT polluted sediment leads to the indication of specific potential TBT degraders. Two new strains of bacteria designated as B2...

... The fabrics of welders' protective garments can be worn out after only one or two use-wash cycles. It is probable that the by-products in the welding process, i.e., ultraviolet C-type (UVC) radiation, ozone, metal fumes, can contribute to the molecular changes responsible for the degradation...

... transfer non-destructive testing turnout gear fire fighter degradation digital image analysis Peter A. Thorpe I and David A. Torvi I Journal of ASTM International, June 2004, Vol. 1, No. 6 Paper ID JAI12119 Available online at www.astm,org Development of Non-Destructive Test Methods for Assessing...

... in the behavior of sealants was observed for exposures with and without fatigue cycling, confirming the importance of fatigue cycling in the degradation of sealants. In order to obtain a good correlation between accelerated weathering and actual service performance, a proper balance of degradation factors...

... results after laboratory and field exposure. NOL ring seismic retrofit wet layup adhesive bonding prepreg winding degradation field exposure Vistasp M. Karbhari, 1James Zhang,2Lixin Wu,3 and David Reynaud4 Materials and Durability Characterization of Composite Wrap Systems Using NOL Ring...

... deterioration of the lubrication film. piston slipper lubrication degradation polishing wear surface fatigue Jeffrey T. Sikes1 Failure Mechanism of a Hydraulic Log Piston and Slipper Assembly Reference: Sikes, J. T., "Failure Mechanism of a Hydraulic Log Piston and Slipper Assembly," Hydraulic...

.... The models are used to reduce laminate-specific microcracking data to general design data in the form of fracture toughness versus cycle ( G Ic ( N )) curves. accelerated aging damage degradation design durability environmental effects material properties polyimides polymer matrix composites...

... on the physical and structural characteristics of PHO, studied the mechanism and degradation rate of PHO in vitro over a 24-month period in physiological media and finally, investigated the biocompatibility and degradation rate of PHO in vivo as a new sealant for the polyester arterial prosthesis. Results...

... A study was performed to assess the effects of tri-calcium phosphate filler on the tissue response, mechanical properties and degradation characteristics of injection moulded poly L-lactide (PLLA) and poly-hydroxybutyrate co valerate (7 mole % valerate) (PHB7V). Test pieces for mechanical...

... This study describes the degradation behavior of biodegradable scaffolds fabricated from a copolymer of polylactic acid and polyglycolic acid using a new technique that eliminates some of the problematic issues with the salt-leaching technique. Two variations of this technique were used...

... substances could result in unwanted wall sorption or catalyzed degradation. The use of a stainless steel core casing, while generally considered to be inert for most test substances, can become very expensive, increasing the overall cost of the field project. for these reasons, the modular lysimeter design...

... An increase in the frequency of fuel degradation following a primary breach in boiling water reactor (BWR) rods was observed during the late-1980s and early 1990s; these rods were often found to contain axial splits. Several failed rods containing splits have been returned to the Vallecitos...

... Thermo-oxidative aging produces a non-uniform degradation state in PMR-15 resin. A surface layer, usually attributed to oxidative degradation, forms. This surface layer has different properties from the inner material. A set of material tests was designed to separate the properties...

... This report describes the results of studies made for the purpose of detecting the irradiation embrittlement of low-alloy steel used for nuclear reactor pressure vessels. For the method of using eddy current to detect material degradation, the device and the sensor employed are light in weight...

... The effect of absorbed moisture on the fiber and interfacial strengths of an epoxy reinforced with continuous fibers of E-glass has been investigated. Single-fiber fragmentation tests of E-glass/epoxy model composites have shown degradation of both the strength of the fiber and the strength...

... materials computational simulation damage degradation durability fracture laminates structural degradation fracture (materials) Levon Minnetyan l and Christos C. Chamis 2 The Compact Tension, C(T), Specimen in Laminated Composite Testing REFERENCE: Minnetyan, L. and Chamis, C. C., "The Compact...