褶皱对玻璃钢疲劳性能的影响

风机叶片的主梁由于铺层较厚很容易产生褶皱,而褶皱会加剧叶片在运行中的疲劳破坏,大幅度降低叶片的使用寿命。通过制作不同类型的褶皱,系统地研究了不同褶皱高宽比、不同褶皱偏移角度、不同褶皱宽度比例对叶片主梁材料疲劳性能的影响。研究表明:随着褶皱高宽比的增加,玻璃钢的疲劳寿命下降得最为严重;同一褶皱条件下,偏移不同的角度对玻璃钢的疲劳寿命影响基本相同,在一定褶皱宽度比例范围内,疲劳寿命下降程度较低,超过一定比例疲劳寿命开始大幅度下降。

THE EFFECT OF FOLDING ON THE FATIGUE PROPERTIES OF GLASS FIBER REINFORCED PLASTICS

AS the layer of glass fabric increases,the fold is more likely to be produced in the manufacturing process of blade girder.Due to the existence of fold,the fatigue performance of blade becomes worse and the operation life will be drastically declined.By designing different types of fold system and manufacturing different samples,the influence of different fold ratio,different fold offset angle and fold width ratio on the fatigue performance of blade girder was studied in detail in this article.The results show that the fatigue performance of GFRP declined sharply with the increase of ratio between height and width of the fold.And no obvious difference was found in the fatigue performance when the samples with different angular offset were tested under the conditions of same fold.Within the certain range of ratio between fold width,the fatigue performance declined slowly.But,when it is above the certain range,the performance began to drop sharply.