| 超高韧性水泥基复合材料疲劳损伤模型试验 |
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| 引用本文： | 徐世烺,刘问.超高韧性水泥基复合材料疲劳损伤模型试验[J].中国公路学报,2011(6). |
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| 作者姓名： | 徐世烺 刘问 |
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| 作者单位： | 大连理工大学建设工程学部; |
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| 基金项目： | 国家自然科学基金项目(51008270) |
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| 摘 要： | 为研究超高韧性水泥基复合材料(UHTCC)的疲劳特性,对其进行了弯曲疲劳试验;在UHTCC弯曲疲劳试验的基础上,从连续损伤力学出发,基于弹塑性各向同性损伤模型,研究了该材料在等幅重复荷载下的弯曲疲劳累积损伤性能,并建立了关于D-S的疲劳损伤模型。为准确描述该材料的损伤演变,模型中引用了起始损伤Ds的概念表示第Ⅰ变形阶段的损伤量;采用试件底面塑性应变εp作为变量计算损伤量D;根据试验曲线拟合得出损伤模型的各项参数。结果表明:UHTCC在不同应力水平S下的起始损伤量和累积损伤程度随应力水平的降低而变小,与实际情况相符;损伤模型的计算曲线与试验曲线吻合良好。
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| 关 键 词： | 道路工程 超高韧性水泥基复合材料 弹塑性损伤力学 起始损伤量 累积损伤程度 |
Fatigue Damage Model Test of Ultra-high Toughness Cementitious Composites |
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| XU Shi-lang,LIU Wen.Fatigue Damage Model Test of Ultra-high Toughness Cementitious Composites[J].China Journal of Highway and Transport,2011(6). |
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| Authors: | XU Shi-lang LIU Wen |
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| Institution: | XU Shi-lang,LIU Wen(Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China) |
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| Abstract: | In order to study the fatigue properties of ultra-high toughness cementitious composites(UHTCC),flexural fatigue tests on UHTCC were carried out.Based on the continuum damage mechanics theory and elastic-plastic isotropic damage model,the cumulative flexural fatigue damage performance of UHTCC under constant amplitude cyclic loading was studied,the fatigue damage model of D-S was established.In order to describe its damage evolution exactly,the concept of starting damage Ds which expressed the damage value ... |
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| Keywords: | road engineering UHTCC elastic-plastic damage mechanics starting damage cumulative damage degree |
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