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Flexural creep behavior and life prediction of GFRP-balsa sandwich beams

机译：GFRP-轻木夹芯梁的挠曲蠕变行为及寿命预测

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摘要

In this paper, the flexural creep behavior of composite sandwich beams with glass fiber- reinforced polymer (GFRP) face sheets and a balsa wood core was investigated. First, static three-point bending tests for the beams were conducted, and an average ultimate bearing capacity of 6.08 kN was obtained. Then, ten bending creep test devices were designed and manufactured based on the principle of leverage. Creep experiments were carried out for a period of 3000 h at four different load levels corresponding to 20%, 40%, 60% and 80% of the ultimate bearing capacity. The results show that the creep behavior exhibits linear viscoelastic properties when the load level is less than 40%, while creep failure occurs in all specimens at load levels of 60% and 80%. Specimens subjected to the 60% load level exhibit two failure modes, i.e., core shear failure and overall bending failure, while specimens subjected to the 80% load level exhibit only bending failure. Furthermore, the experimental creep curves at the 20% and 40% load levels are successfully fitted by the Bailey-Norton and Findley models, and a life prediction method is proposed to predict the creep life of the beams at any load level.
机译：本文研究了玻璃纤维增​​强聚合物（GFRP）面板和轻木芯的复合夹层梁的挠曲蠕变行为。首先，对梁进行了静态三点弯曲测试，得出的平均极限承载力为6.08 kN。然后，根据杠杆原理设计制造了十个弯曲蠕变试验装置。蠕变实验在四个不同的载荷水平下进行了3000小时，分别对应于极限承载力的20％，40％，60％和80％。结果表明，当载荷水平小于40％时，蠕变行为表现出线性粘弹性，而在60％和80％载荷水平下，所有试样均发生蠕变破坏。承受60％载荷水平的试样表现出两种破坏模式，即岩心剪切破坏和整体弯曲破坏，而承受80％载荷水平的试样仅表现出弯曲破坏。此外，Bailey-Norton和Findley模型成功拟合了在20％和40％载荷水平下的实验蠕变曲线，并提出了寿命预测方法来预测在任何载荷水平下梁的蠕变寿命。

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  • 来源
    《Composite Structures》 |2019年第9期|111009.1-111009.12|共12页
  • 作者

    Li Xiaolong; Liu Weiqing; Fang Hai; Huo Ruili; Wu Peng;

  • 作者单位

    Nanjing Tech Univ, Coll Civil Engn, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Adv Engn Composites Res Ctr, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Civil Engn, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Civil Engn, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Civil Engn, Nanjing 211816, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Creep; Sandwich structure; Flexural test; Life prediction;

    机译：蠕变;三明治结构;弯曲试验;寿命预测;

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