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首页> 外文学位 >Effect of temperature on the fatigue behavior of plain weave woven carbon fabric-reinforced composite plastic.
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Effect of temperature on the fatigue behavior of plain weave woven carbon fabric-reinforced composite plastic.

机译：温度对平纹编织碳纤维增强复合塑料疲劳性能的影响。

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摘要

During service, engineering structures and components made from Carbon Fiber-reinforced Plastics (CFRPs) are often subjected to cyclic loading as well as varying environmental temperatures. Fatigue failure of CFRPs is complicated and quite different from those of isotropic materials. In this study, the influence of environmental temperature on fatigue response of Plain Weave Woven Carbon Fabric-reinforced Composite Plastic was examined. The 8-ply laminates were obtained from epoxy resin prepreg fabric layers, stacked in two different sequences producing unidirectional [0]8 and angle plied [0,0,45,−45] s orientations. The fatigue tests were carried out at −20°C, 0°C, 24°C, 100°C, and 150°C. Enhanced-dye penetrant X-ray radiography and Scanning Electron Microscope Fractography was used to characterize the fatigue damage. The fiber/matrix interface strength, that is the most critical parameter in initiation of primary matrix cracks and interply delamination was found to vary with testing temperature. It was found that there was no change in sequence of damage events but duration of each event and hence cumulative damage rates were different with varying temperatures. The fatigue life at elevated temperature was found to decrease with increasing temperature but decreasing temperature below ambient conditions caused an increase in fatigue life for both classes of woven laminates. An analytical model used for CFRP life prediction based on Stiffness Degradation during cyclic loading has been successfully employed. A parameter Dcritical (critical damage) that was a function of testing temperature and indicated the least stiffness value in Modulus Degradation curves was introduced. A reasonably good correlation has been obtained between predicted and experimental lives.
机译：在维修过程中，由碳纤维增强塑料（CFRP）制成的工程结构和部件通常会承受周期性载荷以及变化的环境温度。 CFRP的疲劳破坏是复杂的，与各向同性材料完全不同。在这项研究中，研究了环境温度对平纹编织碳纤维增强复合塑料疲劳响应的影响。从环氧树脂预浸料坯织物层获得8层层压板，以两种不同的顺序堆叠，产生单向[0] 8 和角度为[0,0,45，-45] s < / sub>方向。疲劳试验在-20℃，0℃，24℃，100℃和150℃下进行。使用增强染料渗透剂X射线照相和扫描电子显微镜断层扫描来表征疲劳损伤。纤维/基体界面强度是初始基体裂纹萌生和层间分层的最关键参数，它随测试温度而变化。发现损坏事件的顺序没有变化，但是每个事件的持续时间，因此累积损坏率随温度变化而不同。发现高温下的疲劳寿命随着温度的升高而降低，但是降低到低于环境条件的温度导致两种编织层压板的疲劳寿命增加。已经成功地采用了基于循环载荷过程中刚度退化的CFRP寿命预测分析模型。引入了参数D critical （临界损伤），该参数是测试温度的函数，并且在模量降解曲线中表示最小的刚度值。在预测寿命和实验寿命之间已经获得了相当好的相关性。

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  • 作者

    Khan, Rehan Ikram.;

  • 作者单位

    King Fahd University of Petroleum and Minerals (Saudi Arabia).;

  • 授予单位 King Fahd University of Petroleum and Minerals (Saudi Arabia).;
  • 学科 Engineering Mechanical.
  • 学位 M.S.
  • 年度 2000
  • 页码 127 p.
  • 总页数 127
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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