Research On The Single Fiber Compression Bending Properties Of High Strength Fiber

The excellent performance of high-strength fiber makes it have outstanding performance in industry,protection and other aspects.In recent years,as its application in various fields has been gradually widened,the performance of high-strength fiber has received much attention.Based on the production and research status of high-strength fibers in my country,it is of practical value and practical significance to carry out research on the single-fiber compression and bending properties of high-strength fibers.This subject is to test the single fiber compression and bending properties of several high-strength fibers,to obtain test data characterizing the fiber compression and bending properties,and to draw high-strength fiber compression and bending curves according to the test results.At the same time,a series of basic structure and performance tests were conducted on high-strength fibers.The effects of aging at different temperatures on the compression and bending properties of high-strength single fibers are studied,and the changes of the curves are drawn and summarized.The basic performance and structure of high-strength fibers was tested,the results show that:the surface morphology of high-strength fibers is observed under a scanning electron microscope,and the four fibers tested are found in order of surface roughness from high to small:high-strength polyethylene fibers>Aramid?fiber>PBO-AS fiber>Kevlar fiber;fiber surface wettability test also confirmed this result.The X-ray diffractometer was used to test the high-strength fiber samples,and the data was imported into the MID Jade software for crystallinity calculation.The orientation degree was calculated using the definition formula of the axial orientation index.High-strength polyethylene fiber>Technora fiber>Aramid?fiber>PBO-AS fiber.The test on single fiber compression and bending performance of high-strength fibers shows that the highest strength and bending stiffness of Technora fiber is the highest among the tested high-strength fibers,which are 0.6324m N and 6.2360×10^-5c N·cm²,respectively.It can be seen that Technora fiber is the hardest to bend.Comparing the compression and bending curves of high-strength fibers,it can be found that the curve of high-strength polyethylene fiber changes the most violently.During compression and bending,the load value of the fiber reaches the maximum and then drops sharply,after which the curve gradually stabilizes.The compression-bending curve of other fibers changes gently.Comparing the test results of the compression and bending properties of three high-strength fibers after aging at different temperatures,and analyzing the effect of aging temperature on their compression-bending curves,it was found that the position where the load of the Technora fiber reaches the critical point is generally ahead of the PBO-AS fiber and the Technora fiber after aging under different temperature conditions,the increase or decrease of the maximum force is not large,and the change is relatively gentle;compared with it,the maximum force variation of the aramid?fiber is larger,and the distribution of the compression bending curve in the coordinate chart is more Technora The fibers are more dispersed.The analysis of the compression and bending indicators of high-strength fibers after aging at different temperatures shows that the maximum force,equivalent bending modulus and flexural rigidity of PBO-AS fibers increase with aging temperature,and the trend is from30?to 60?The maximum force of PBO-AS fiber increases the fastest.When the aging temperature is 60?,the maximum force of PBO-AS fiber is higher than that of aramid?fiber,which shows that PBO-AS fiber has excellent bending resistance after high temperature aging for aramid?fiber,aramid?fiber is rapidly growing at maximum aging temperature between 0?and 30?.Technora and aramid?fiber with the increase of aging temperature,the change trend of each indicator is to increase first and then decrease.The maximum force of Technora fiber begins to decrease after 60?,while aramid?fiber begins to decrease after 90?,the equivalent bending modulus of Technora fiber is that the aging temperature starts to decrease after 30?,aramid?fiber It is that the equivalent bending modulus decreases rapidly after 60?.This paper contains 39 figures,18 tables,78references.