• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Composite Structures >Flexural fatigue characteristics of sandwich structures at different loading frequencies
【24h】

Flexural fatigue characteristics of sandwich structures at different loading frequencies

机译：夹芯结构在不同载荷频率下的弯曲疲劳特性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The effects of frequency on the fatigue behavior of S2 glass fiber-vinylester reinforced sandwich composites with two different PVC cores have been investigated. Flexural fatigue tests were performed on sandwich beams with core densities of 130 and 260 kg/m~3 at frequencies of 3 and 15 Hz, at a stress ratio, R = 0.1 and at four different load levels viz. 90%, 85%, 80% and 75% of the ultimate load. S-N diagrams were generated and it was observed that the fatigue strength increased with core density, and the number of cycles to failure, N_f, increased with increase in frequency. In all cases failure was dominated by a primary shear crack in the core however, the crack path and crack propagation rates varied with frequency. The fatigue crack growth rate (FCGR) in the core of the H130 sandwich beams was subsequently investigated and the relationship between the crack growth rate, da/dN, and the cyclic stress intensity range, △K, was determined. It was found that crack growth rate decreased with increase in loading frequency.
机译：研究了频率对具有两个不同PVC芯的S2玻璃纤维-乙烯基酯增强夹芯复合材料疲劳性能的影响。在芯密度为130和260 kg / m〜3的夹层梁上，以3和15 Hz的频率，应力比R = 0.1和四个不同的载荷水平进行弯曲疲劳试验。极限载荷的90％，85％，80％和75％。生成了S-N图，并观察到疲劳强度随铁心密度的增加而增加，失效循环数N_f随着频率的增加而增加。在所有情况下，破坏都是由岩心中的一次剪切裂缝决定的，但是，裂缝的路径和裂缝的传播速率随频率而变化。随后研究了H130夹层梁核心的疲劳裂纹扩展速率（FCGR），并确定了裂纹扩展速率da / dN与循环应力强度范围△K之间的关系。发现裂纹扩展速率随着加载频率的增加而降低。

著录项

  • 来源
    《Composite Structures》 |2005年第4期|p.403-410|共8页
  • 作者

    K. Kanny; H. Mahfuz;

  • 作者单位

    Department of Mechanical Engineering, Durban Institute of Technology, South Africa;

  • 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 工程材料学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号