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为研究超高韧性水泥基复合材料的损伤扩展规律,该文对该材料的预制单边切口试件进行了三点弯曲疲劳试验。基于连续损伤力学,建立两种疲劳损伤扩展模型:一是以J积分作为自变量的双对数线性模型,二是以疲劳应力水平作为自变量的单对数线性模型。结果表明,两种模型计算结果与试验结果吻合良好。但J积分取值很大程度上依赖于试件的几何特征,导致模型1受试件形状影响较大;实际应用中,由于疲劳应力水平的获得相对直观方便,故模型2更加实用。
In order to study the damage propagation law of ultra-high toughness cement-based composites, three-point bending fatigue test was carried out on the prefabricated single-incision specimens of this material. Based on the continuous damage mechanics, two fatigue damage expansion models are established: one is the logarithmic linear model with J integral as independent variable and the other is the logarithmic linear model with fatigue stress level as independent variable. The results show that the calculated results of the two models are in good agreement with the experimental results. However, the value of J integral depends largely on the geometric characteristics of the specimen, resulting in a greater impact on the shape of the specimen under test. In practical applications, Model 2 is more practical because the fatigue stress level is relatively easy to obtain.