... A methodology is shown for predicting the time-dependent reliability of ceramic components against catastrophic rupture when subjected to transient thermomechanical loads (including cyclic loads). The methodology takes into account the changes in material response that can occur with temperature...

... development in ISO Committee TC 206, Fine Ceramics. The SRM is a set of five silicon nitride test specimens. The SRM may be used with any credible ceramic fracture toughness test method, but has been optimized for test methods that use beams in bending. Identical results are obtained with single-edge...

... Over the last 13 years the Versailles project on Advanced Materials and Standards (VAMAS) has conducted five full fledged, international round robins on ceramic fracture toughness characterization. As many as forty laboratories have done thousands of experiments on silicon nitride, silicon...

... In order to understand the fracture behavior of the structural ceramics at elevated temperatures, the R-curve behavior of silicon nitride based ceramics was measured by using single edge notched beam (SENB) specimens, at room and elevated temperatures. It is difficult to obtain stable fracture...

... The fracture toughness of alumina, zirconia, silicon nitride, and silicon carbide ceramics as well as silicon nitride and silicon carbide particulate composites were studied by the single edge V-notched beam (SEVNB) method over a wide temperature range. Manual and mechanical procedures for V...

... Dynamic fatigue or constant stress-rate testing is a convenient method for generating SCG (slow crack growth) data on ceramics and glasses. The tests are simple, inexpensive, and accomplished quickly. However, the use of dynamic fatigue testing to generate slow crack growth data for SCG...

... The application of fracture mechanics to advanced technical ceramics was initiated nearly 30 years ago. It was heralded by an international conference at the Pennsylvania State University in 1973. Unbridled optimism prevailed as many believed that the coupling of fracture mechanics with ceramics...

... are demonstrated. Second, the role of microstructure in governing the transition from single crystal to polycrystalline values of toughness is shown. I postulate that mixed mode fracture mechanics expressions can be used to explain the transition in fracture toughness. ceramics fracture toughness grain...

... Plates of both square and round geometries are tested to determine the strength and fatigue properties of ceramics under multiaxial stresses. The necessary tolerances required for accurate testing are not well documented in published literature. The stresses in square and round plates subjected...

... An ASTM standard test method for determination of fracture toughness has been created for advanced ceramics. Standard C 1421-99 includes three test methods and is suitable for ceramics with flat R -curve behavior, but includes some provisions for materials with rising R -curve. The three...

... New Standard Reference Material (SRM) 2100 is the first reference material in the world for the property fracture toughness for any class material. The SRM is for fracture toughness of ceramics and may be used with any ceramic fracture toughness test method, but is optimized for methods that use...

... coatings, and ceramics were tested. To verify the positive results obtained in the model, one of the materials which was classified as suitable is tested in a swashplate unit. hydraulics high water-based fluids tribology ceramics coatings plastics surfaces wear friction Richard OberemI...

.... Cracking and spalling out in the slip region are both observed in some instances. The critical normal force at which fatigue failure occurs, was determined for bulk ceramics and ceramic coatings. The evolution of the electrical contact resistance in the case of self-mated soft tin coatings tested under...

... was lubricated. anisotropy single crystals ceramics composites multiaxial strength nickel aluminide tungsten carbide displacement strain stress J. A. Salem I and M. G. Jenkins 2 Biaxial Strength Testing of Isotropic and Anisotropic Monoliths REFERENCE: Salem, J. A. and Jenkins, M. G., "Biaxial...

... Ceramic on ceramic bearings applications were developed, in Europe, 27 years ago. After the initial failures related to both manufacturing problems as well as the surgeons learning curve, these materials now appear to be very promising for total hip replacement surgery in young and active...

... test was developed under subcontract to Oak Ridge National Laboratory to help to assess the grindability of structural ceramic materials. The procedure involves applying a 10 N normal force to the end face of a 3 × 4 mm cross-section test bar for 30 seconds which is rubbed against a wet, 220 grit...

..., a description of the grain boundary sliding mechanism in terms of motion of grain boundary dislocations is needed. ceramics zirconia alumina high-temperature anelasticity internal friction damping mechanical loss grain boundary sliding A. Lakki I and Robert Schaller I Damping Due to Grain...

... The piezoelectric ultrasonic composite oscillator technique (PUCOT) was used at frequencies near 120 kHz to measure the elastic and anelastic properties of two kinds of advanced ceramics as a function of temperature ( T ) up to about 1300 K and of strain amplitude in the range 10 -7 to 10 -4...

... The concept of employing thermally stable compounds (that is, metal oxides) as high temperature vapor phase ceramic lubricants was investigated. A major part of this study was devoted to the development of various calorimetric and tribological techniques that could be used to determine...

.... The relative proportions of cracking and plastic response seemed to vary with tool shape, material, and microstructure. surface coatings surface treatments wear testing ceramics coatings plasma-sprayed coatings scratching indentation hardness elastic modulus Arthur W. R u f f 1...