... to avoid deformation-induced temperature accumulation. The temperature was measured by a nontactile pyrometer. The objective was to minimize excessive heating while also chilling with high-pressure dry air. The results were then used to train a machine-learning algorithm that can make predictions about...

... The effect of processing and machining on the dimensional stability of polychlorotrifluoroethylene (PCTFE) rod stock and oxygen gas cylinder valve seats was investigated. Initial testing focused on two types of extruded rod stock and one type of compression-molded rod stock made from the same...

... More complicated and expensive machine tools together with production with limited manpower requires disturbance free and safe manufacturing, to avoid expensive and unexpected stops. The result of a machining operation is based on the interaction between manufacturing method, the machine tool...

... function to evaluate the cost of a design sequence. Forging Optimization Machining Simplified Models Christian E. Fischer, 1Jay S. Gunasekera, 2 James C. Malas 3 PROCESS MODEL DEVELOPMENT FOR OPTIMIZATION OF FORGED DISK MANUFACTURING PROCESSES REFERENCE: Fischer, C.E., Gunasekera, J.S...

... Continuous-fiber ceramic composites (CFCC) are a relatively new area of composite materials in research. Therefore, the feasibility of using abrasive waterjets (AWJ) as a secondary CFCC process was explored. Continuous fiber-reinforced advanced ceramic composite materials have been machined...

... with detailed fractography are summarized using Weibull statistics including competing risk analyses. Specimen fabrication and mechanical testing issues (e.g. machining, strain gaging) which were addressed to ensure the integrity of the strength database will also be discussed. silicon nitride...

... criterion. The nature of these problems is discussed, along with corrective actions. slow strain rate (SSR) test time to failure percent reduction of area percent elongation environments strain rate surface preparation deaeration machining machine compliance calibration Edward L. Hibner...

... Research over the last several years has established the effectiveness of acoustic emission (AE) based sensing methodologies for machine condition analysis and process monitoring. Acoustic emission has been proposed and evaluated for a variety of sensing tasks as well as for use as a technique...

... Control during alpine skiing is achieved principally through the mechanical interaction between the ski and the snow. In that the nature of this interaction is basically a cutting or machining process, it is proposed that the complex physical and mechanical properties of the snow responsible...

... The surface and near-surface regions in diamond machined Cu have been investigated by high resolution transmission electron microscopy, scanning electron microscopy, and scanning transmission electron microscopy. This study has revealed that the near-surface region produced by diamond machining...

... surface observations of controlled indentation flaws provide essential insight into the scattering process and the mechanics of failure. With more complex flaw configurations, such as machining damage, acoustic scattering measurements provide a unique method for examining the micromechanics of failure...

... preheat postheat automatic submerged arc welding stainless steel overlay nondestructive examination machining erection postweld heat treatment /. E. Bonta^ and O. G. Sikora^ Fabrication of Heavy-Wall Pressure Vessels REFERENCE: Bonta, I. E. and Sikora, O. C , "Fabrication of Heavy-Wall Pressure...

... interest in coal-hydrogenation processes. abrasion coal-hydrogenation cutting ductile metals erosion erosive wear flow stress grinding hardness heat treatment machining metals scratching size effect wear work-hardening /. Finnie,1 A. Levy,1 and D. H. McFadden1 Fundamental Mechanisms...

.... Within the range used in normal specimen manufacture, few significant effects were observed. Tests were made using manually controlled, as well as computer-controlled, machines. Again, the differences were generally small, but the differences in tensile strength and elongation were statistically...

... direction. Attention is drawn to the possibly dangerous combination of stresses resulting from heat treatment, machining, and interference assemblies. It is shown that the mere presence at the surface of a forging of residual compressive stresses resulting from heat treatment is no guarantee that stress...

... The contract tool, die, and precision machining industry faces unique problems in the area of metrication due to its role as a supplier industry. Although little work to metric specifications is presently being done, and a significant level of awareness exists in the industry regarding...

... for this decision. metric system units of measurement standards tooling threads pipe threads drawings machining machine tools L. R. Strang, V. W. Schellschmidt, and J. G. Langenstein Metrication Experience at Caterpillar Tractor Co. REFERENCE: Strang, L. R., Schellschmidt, V. W., and Langenstein, J...

... Surface integrity is a subject covering the description and control of the many possible alterations produced in the surface of a component during manufacturing. Surface integrity is evaluated by measuring the influence of machined surface layers on component reliability. This is accomplished...

... malleable iron, and the structural characteristics of the material are reviewed. New design techniques recognize the significance of molding aggregate and metallurgical factors, and the importance of the “feeding path” and “freezing order” concepts is emphasized. Recently developed machinability information...

... Constant-level, completely reversed bending fatigue tests were conducted on unmachined, mechanically machined, and chemically machined aluminum and titanium alloy sheet panels. All unmachined panels had lower fatigue strengths than machined panels because of stress concentration factor...