摘要
针对碳纤维增强环氧基复合材料机械连接结构耐久性设计中的2个关键问题:黏弹性预紧力松弛的温度-时间依赖行为及其长期性能预测方法进行研究。建立了以蠕变全应变理论为基础的预紧力松弛预测模型。36h的恒温耐久试验表明:初始预紧力越大,温度越高,连接件预紧力松弛速率越快;复合材料连接件的松弛速率远大于金属连接件;预紧力松弛主要表现为材料蠕变过程。对比短期试验结果表明:本模型能较好地实现对不同温度、预紧力和连接材料的松弛预测,为确立试验数据的外推方法提供了依据。
Two key problems in structural durability design for mechanically fastened carbon fiber reinforced epoxy composite joints：temperature-time dependent behavior for viscoelastic preload relaxation and prediction method for its long time performance were investigated.Preload relaxation prediction model was developed on basis of the creep total-strain theory.36 hconstant temperature durability tests show that the relaxation rate of preload for joints is faster with the greater initial preload and higher temperature;relaxation rate of composite joints is much greater than that of metallic joints;preload relaxation mainly behaves as the material creep process.Compared to the shortterm test results,it shows that the model can well predict the relaxation for different temperatures,preloads and joint materials,which also provides a basis for extrapolation method of determining test data.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2016年第4期768-778,共11页
Acta Materiae Compositae Sinica
基金
中央高校基本科研业务费专项资金(0220219105)
关键词
复合材料
螺栓连接
预紧力松弛
结构耐久性
预测模型
composites
bolted joints
preload relaxation
structural durability
prediction model
