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制作碳纤维布试件,并对试件进行了为期7d的应力松弛试验,试验结果表明:碳纤维布存在应力松弛现象;随时间增长,松弛应力增加,总的趋势是初期发展快,后期发展慢;张拉初始应力越高,松弛应力越大,但碳纤维布最终留存的应力仍较大;初始应力持荷时间对试验结果影响较大,持荷一定时间后,碳纤维布应力松弛率明显降低。试验结果对分析、计算碳纤维布的预应力损失有一定的指导意义。
The test results show that: there is stress relaxation phenomenon of carbon fiber cloth; with the increase of time, the relaxation stress increases, the general trend is the initial rapid development, the latter part of the slow development; The higher the initial tensile stress is, the larger the relaxation stress is. However, the final retained stress of carbon fiber cloth is still large. The initial stress holding time has a great influence on the test results. After holding for a certain period of time, the stress relaxation rate of carbon fiber cloth decreases obviously. The test results have certain guiding significance for the analysis and calculation of the prestress loss of carbon fiber cloth.