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首页> 外文期刊>International Journal of Damage Mechanics >Flexural fatigue damage model of ultra-high toughness cementitious composites on base of continuum damage mechanics
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Flexural fatigue damage model of ultra-high toughness cementitious composites on base of continuum damage mechanics

机译：基于连续损伤力学的超高韧性水泥基复合材料弯曲疲劳损伤模型

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摘要

Ultra-high toughness cementitious composite is a fiber reinforced cementitious material, with the characteristics of strain hardening and multiple cracking under uniaxial tension. It could be applied in some structures to sustain complicated loading conditions, such as fatigue loads. This paper presents an experimental and theoretical investigation on the flexural fatigue damage property of ultra-high toughness cementitious composites. Based on continuum damage mechanics and elastic-plastic isotropic damage model, a flexural fatigue damage model of ultra-high toughness cementitious composites is developed. The parameter of starting damage D_s is introduced, which equals to the damage amount happening in fatigue stage I. Meanwhile, the plastic strain ε_p on the bottom surface of the standard specimen is employed to calculate fatigue damage, D. The fitted parameters of the damage model are obtained with the experimental data. The research result shows that the starting damage amount and the cumulative damage degree drop with the decrease of stress levels. It is proved that this fatigue damage model is applicable to calculate the fatigue damage of ultra-high toughness cementitious composites.
机译：超高韧性水泥基复合材料是一种纤维增强的水泥基材料，具有单轴张力下的应变硬化和多次开裂的特性。它可以应用于某些结构中以承受复杂的载荷条件，例如疲劳载荷。本文对超高韧性水泥基复合材料的弯曲疲劳损伤特性进行了实验和理论研究。基于连续损伤力学和弹塑性各向同性损伤模型，建立了超高韧性水泥基复合材料的弯曲疲劳损伤模型。引入初始损伤参数D_s，该参数等于疲劳阶段I中发生的损伤量。同时，使用标准试样底表面的塑性应变ε_p计算疲劳损伤D。损伤的拟合参数用实验数据获得模型。研究结果表明，随着应力水平的降低，初始损伤量和累积损伤程度降低。实践证明，该疲劳损伤模型适用于计算超高韧性水泥基复合材料的疲劳损伤。

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