Dynamic and static stress concentration factors ao, and as generated at a fillet part are observed by photoelastic method, and the comparison between two different factors is carried out. Next, the reflection coefficient A is calculated using the height of incident and reflected waves measured by the strain gauge. As the result, following relationship a= ( I+ A )as is derived experimentally. Th...

In this paper, a method to calculate the dynamic stress concentration around triangular defect of piezoelectric material under electroelastic coupling is studied and applied promising barium calcium zirconate titanate. Firstly, governing equation decomposed by decoupling technique, analytical solutions elastic wave field electric are obtained function expansion method. Then, conformal transform...

In this work, gate dielectric degradation under dynamic Fowler-Nordheim (FN) stress is studied. A novel interface characterization technique, direct-current current-voltage (DCIV) technique, is used to measure the interface trap generation caused by dynamic FN stress. The dependence of interface trap generation on stress time is always found to follow a power-law, which is similar to the situat...