Chang Lhymn

Effect of Environment on the Two-Body Abrasion of Polyether Etherketone (PEEK)/Carbon Fiber Composites

The wear behavior of fibrous polymer composites in various environments was investigated and the measured tribological data were correlated with the observed microstructures. The observed data were explained by means of theoretical wear/friction equations derived previously from fracture mechanics concepts. Wear and friction were measured in tests of carbon-fiber reinforced polyether etherketone (PEEK) sliding against emery paper in a pin-on-table abrasive wear machine. Results were obtained in air and also wing water and oil as lubricants. The wear rate decreased as the normal load increased and a fatigue wear mechanism based on microstructural observations was employed to explain the measured data. The microstructural features strongly implied a damage accumulation mechanism via crack initiation/propagation along tile weak path. Presented as an American Society Of Lubrication Engineers paper at the ASME/ASLE Tribology Conference in Pittsburgh, Pennsylvania, October 20–22, 1986

Thickness dependence of dielectric breakdown voltage

Abstract Some thought was given to the electric breakdown mechanism of anodic aluminum oxide. The foundation of the proposed void erosion model lies in microstructural observation and channel propagation physics. A statistical analysis of the scatter in breakdown voltage data is presented.

Some deformation features in mechanical and electrical breakdown of fibrous polymer composites

SummaryObservations have been made for deformational features due to mechanical load or due to electric force for thermoplastic matrix reinforced by short glass fibers. Morphological aspects common for both phenomena have been noted.

Microscopy of electrical treeing behavior

Abstract The microstructural sequence of electrical treeing behavior has been presented from a study of electric breakdown lifetime and microscopy. The effect of absorbed moisture on the electric lifetime has been explained by means of the electric lifetime equation.