四点弯曲型试件的裂纹面张开位移

Opening displacement of crack surface in four-point-bend specimen

研究了四点弯曲型试件在各种类型载荷作用下的裂纹面位移，并考虑了裂纹尖端塑性区对它的影响。得到了它的计算式与数值计算程序，为研究疲劳裂纹的闭合行为提供了分析手段。

A crack surface displacement of four-point-bend specimen under three types of loading is studied in this paper. Considering the effect of plastic zone ahead of crack tip, the authors develop a set of formulas and procedure of numerical calculation, which provide an analytical means for studying the fatigue crack closure.