| 基于连续损伤力学的UHTCC疲劳损伤扩展模型研究 |
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| 引用本文： | 罗璐, 刘问, 徐世烺, 任贇跃. 基于连续损伤力学的UHTCC疲劳损伤扩展模型研究[J]. 工程力学, 2017, 34(1): 22-27. DOI: 10.6052/j.issn.1000-4750.2015.05.0458 |
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| 作者姓名： | 罗璐 刘问 徐世烺 任贇跃 |
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| 作者单位： | 1.北京林业大学土木工程系, 北京 100083;;2.浙江大学高性能建筑结构与材料研究所, 杭州 310058 |
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| 基金项目： | 国家自然科学基金项目（51308046） |
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| 摘 要： | 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。
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| 关 键 词： | 结构工程 疲劳损伤扩展模型 连续损伤力学 超高韧性水泥基复合材料 J积分 疲劳应力水平 |
| 收稿时间： | 2015-05-28 |
| 修稿时间： | 2016-01-05 |
FATIGUE DAMAGE PROPAGATION MODELS FOR ULTRA-HIGH TOUGHNESS CEMENTITIOUS COMPOSITES WITH CONTINUUM DAMAGE MECHANICS |
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| LUO Lu, LIU Wen, XU Shi-lang, REN Yun-yue. FATIGUE DAMAGE PROPAGATION MODELS FOR ULTRA-HIGH TOUGHNESS CEMENTITIOUS COMPOSITES WITH CONTINUUM DAMAGE MECHANICS[J]. Engineering Mechanics, 2017, 34(1): 22-27. DOI: 10.6052/j.issn.1000-4750.2015.05.0458 |
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| Authors: | LUO Lu LIU Wen XU Shi-lang REN Yun-yue |
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| Affiliation: | 1.Department of Civil Engineering, Beijing Forestry University, Beijing 100083, China;;2.Institute of Advanced Engineering Structures and Materials, Zhejiang University, Hangzhou 310058, China |
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| Abstract: | The damage propagation property of Ultra-high toughness cementitious composites (UHTCC) was studied using three-point flexural fatigue tests on single-notched specimens. Based on the continuum damage mechanics and the flexural fatigue damage model, two fatigue damage propagation models were built. One was a bi-logarithmic linear model with J-integral range as its independent variable. The other was a semi-logarithmic linear model with fatigue stress level as its independent variable. Results from the two models fit well with experimental results. However, because the J-integral is strongly dependent on the specimens' geometry, the first model was affected significantly by the specimens' shape. The second model is expected to be more applicable in engineering practice since the fatigue stress level is easy to obtain. |
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| Keywords: | structural engineering damage propagation model continuum damage mechanics UHTCC J-integral fatigue stress level |
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