考虑桥联影响的复合材料带域中反平面裂纹动态扩展问题

讨论了纤维加强复合材料带域中，半无限长反平面裂纹在计及桥联纤维影响时的动态扩展问题，桥联增韧作用借与裂纹面位移相关的应力边界条件给出。应用Fourier变换和Wiener-Hopf技术进行数学分析。最后给出了动态应力强度因子，与已知成果进行比较，表明了结论的可靠性。

On the Propagation of Semi-Infinte Anti-Plane Dynamic Cracks Considering Fiber-Bridged Force in the Strip of Composites

Semi-infinite anti-plane dynamic cracks propagating at constant velocity in the strip of fiber-reinforced composites is discussed considering fiber-bridged force, which is related to the displacement of the crack surface. Using Fourier transforms, we reduced the problem to an equation, which is solved by the Wiener-Hopf technique. The dynamic stress intensity factor is derived, which can not be expressed as the product of a velocity correction factor and a static stress intensity factor. Some valuable conclusions are also given as fellows: (1) The effect of fiber-bridged force on decreasing the value of stress intensity factor at crack tip is obvious . (2) At the same condition, the value of stress intensity factor decreases as the crack propagation velocity increases. Sound velocity is its upper bound. (3) Generally, the value of stress intensity factor becomes bigger as G zy becomes smaller, but the value does not change obviously if G zy is very small. (4) The effect of stress intensity factor on G is not obvious when the value of G is very big.