刘问, 徐世烺, 李庆华. 超高韧性水泥基复合材料疲劳裂缝扩展公式的理论与试验研究[J]. 工程力学, 2013, 30(11): 67-74. DOI: 10.6052/j.issn.1000-4750.2012.05.0362
引用本文: 刘问, 徐世烺, 李庆华. 超高韧性水泥基复合材料疲劳裂缝扩展公式的理论与试验研究[J]. 工程力学, 2013, 30(11): 67-74. DOI: 10.6052/j.issn.1000-4750.2012.05.0362
LIU Wen, XU Shi-lang, LI Qing-hua. THEORICAL AND EXPERIMENTAL STUDY ON FATIGUE CRACK PROPAGATION LAW OF ULTRA-HIGH TOUGHNESS CEMENTITIOUS COMPOSITE[J]. Engineering Mechanics, 2013, 30(11): 67-74. DOI: 10.6052/j.issn.1000-4750.2012.05.0362
Citation: LIU Wen, XU Shi-lang, LI Qing-hua. THEORICAL AND EXPERIMENTAL STUDY ON FATIGUE CRACK PROPAGATION LAW OF ULTRA-HIGH TOUGHNESS CEMENTITIOUS COMPOSITE[J]. Engineering Mechanics, 2013, 30(11): 67-74. DOI: 10.6052/j.issn.1000-4750.2012.05.0362

超高韧性水泥基复合材料疲劳裂缝扩展公式的理论与试验研究

THEORICAL AND EXPERIMENTAL STUDY ON FATIGUE CRACK PROPAGATION LAW OF ULTRA-HIGH TOUGHNESS CEMENTITIOUS COMPOSITE

  • 摘要: 该文基于Paris公式,对具有应变硬化和多缝开裂特征的超高韧性水泥基复合材料(UHTCC)的疲劳裂缝扩展理论进行了理论研究,并通过试验进行验证。研究表明,Paris公式适用于UHTCC。其中:裂缝扩展参数由裂缝面积扩展A表示;与之相应,使用复合断裂能增长量#x00394;J代替应力强度因子变化量#x00394;K。基于试验,该文求出UHTCC的疲劳裂缝扩展门槛值,即当疲劳过程中的断裂能幅值#x00394;J小于某一临界值#x00394;Jth时,疲劳裂缝不扩展。在疲劳过程中,UHTCC的裂缝覆盖面积随疲劳过程呈三阶段线性发展,与疲劳变形的发展趋势一致。UHTCC的疲劳裂缝扩展随疲劳最大荷载与荷载幅值的增大而加速发展。

     

    Abstract: Based on Paris law of fatigue crack propagation rate, a theoretical and experimental investigation was taken to study the fatigue crack propagation mechanism of ultra-high toughness cementitious composite, which exists the characteristics of strain hardening and multiple cracking. Paris law is applicable for this material, with the two parameters redefined: the covering area of multiple cracks, A, and the composite fracture energy, J. A fatigue crack propagation threshold is found in the experiment. During the whole fatigue progress, there exist three linear stages for the development of crack covering area, in correspondence with the three stages of fatigue deformation. Moreover, the crack propagation rate speeds up with the increases of the maximum fatigue load and the fatigue load range.

     

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