The result shows the following important points. The notchcoefficient of interference-fit composite joint is less than the notchcoefficient of sliding-fit composite joint;
研究结果表明复合材料干涉配合接头的有效应力集中系数小于复合材料间隙配合接头的有效应力集中系数；
2
Two examples that are IIR notch filter and IIR low-pass filter are given, the stability of filters and the effects of quantification of coefficient are also analyzed.
The dependence of optimal notch pump power on concentration of erbium ions, signal power and coupling coefficient of pump light is investigated, which provides theoretic basis for device design.