Prediction of service life of aramid woven fabric under high load
The semi-empirical method is used to predict the service life of aramid tape in parachute,but lacks of theoretical basis.In this paper,the creep behavior and impact resistance of type 25-600 Aramid 1414 tape under high loads were used to fit the curve of the load size and creep breaking time and the curve of the impact strength and the number of impact tests,respectively,which can be used to predict the service life of aramid tape under high load,and the orientation and crystallinity of the tape before and after the test were measured.The results show that there is a functional relationship between the load and the logarithm of creep time during the creep process,and the fitting equations of single-layer and single-loop two-layer tapes are lnt=33.65-0.33σ and lnt=32.45-0.31σ,respectively.The slope and intercept of the impact model are twice those of the creep model.When the sample is under the same load,the relation between the logarithm of creep breaking time and the number of impact tests is lnt=An-B,and the number of impact tests can be used to predict the creep breaking time of the tape,and vice versa.The creep and orientation and crystallinity of Aramid 1414 tape before and after impact tests indicate that under the same load,creep and impact have the same damage effect on the tape,which further proves that there is a high correlation between the creep and impact properties of type 25-600 Aramid 1414 tape.
aramid woven fabricaramid tape beltcreephigh loadfitting model
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