三维编织复合材料的疲劳性能

李嘉禄; 杨红娜; 寇长河

三维编织复合材料的疲劳性能

天津工业大学复合材料研究所、先进纺织复合材料天津市重点实验室, 天津 300160,
北京空间机电研究所, 北京 100076,

基金项目: 天津市自然科学基金(023604811)

详细信息

通讯作者:
李嘉禄,教授,主要从事三维纺织复合材料方面的研究工作;会员证号:E63020004GJ E-mail:lijialu@tjpu.edu.cn

中图分类号: TB332
计量
- 文章访问数: 2194
- HTML全文浏览量: 99
- PDF下载量: 2558
出版历程
- 收稿日期: 2004-08-15
- 修回日期: 2005-05-17
- 刊出日期: 2005-08-14

FATIGUE PROPERTIES OF THREE DIMENSIONAL BRAIDING COMPOSITES

Composites Research Institute of Tianjin Polytechnic University &|Tianjin Key Laboratory ofAdvanced Composite Materials, Tianjin 300160, China;
Beijing Institute of Mechanics and Electrics, Beijing 100076, China;
Solid Mechanics Institute of Beijing University of Aeronautics and Ast ronautics, Beijing 100083, China

施引文献

摘要

摘要: 研究了三维编织复合材料的疲劳性能和编织结构对疲劳性能的影响。进行了应力比为011 、实验频率为10 Hz 的拉2拉疲劳性能测试。结果表明, 三维编织复合材料的疲劳强度约为其抗拉强度的60 %～80 % , 比金属材料的疲劳强度的相对值高。编织角是影响三维编织结构复合材料疲劳性能的一个主要因素。随着编织角的增大, 疲劳过程中易出现各种损伤, 而且伴随明显的升温现象。编织角大的试件在疲劳实验过程中模量变化明显, 并且呈现逐渐升高的趋势, 这与金属材料的双模量变化规律不同。在疲劳次数为100 万次后, 试件的剩余强度高于静载拉伸强度, 这主要是由于在疲劳测试过程中, 试件内编织纱线的取向更接近受力方向所致。
- 三维编织复合材料 /
- 疲劳性能 /
- 编织结构 /
- 编织角
Abstract: The dynamic mechanical properties ———fatigue properties and the effect of braiding st ructures on the fatigue properties of three dimensional braiding composites were studied. Tensile-tensile fatigue test s were carried outat different maximum stress ratios . All the tests were run at a stress ratio R(σ_min /σ_max ) = 0.1. The fatigue f requency was 10 Hz. The result s show that the fatigue st rength of three dimensional braiding composites is 60 %～80 % ofit s static strength , which is higher than that of metal material. The braiding angles have a great influence on the fatigue properties of 3-D braiding composites. The fatigue damage will be easy and the hysteresis heat will occur forthe large braiding angle composites. The st rain-st ress curves of the specimens with large braiding angles are non-linear , and the modulus is increasing with the testing time increasing. The variational rule of fatigue properties of threedimensional composites cont rasted with the metal’s rules. After one million times of fatigue test s , the residualst rength of the specimens is higher than the static test st rength , which is due to fiber bundles being reoriented to alower angle toward the tensile loading direction af ter the fatigue test .
- 3-D braiding composites /
- fatigue property /
- braiding-st ructure /
- braiding-angle