Study On The Development Of Glass Yarn Hairiness Detection Method

Glass filament is a high performance,wide range of uses inorganic non-metallic materials,The number of broken glass filament is an important quality indicator for glass fiber filaments.Glass fiber is smooth in appearance,cross-section is almost a full circle,the fibers hold each other with a small force.Under bending force,twisting force,friction force in different directions,the glass fiber filament yarn is so easy to wear that broken glass fibers are formed.By now,there is no special broken glass fiber testing equipment,there are many disadvantages in the traditional equipment.Therefore,the detection of broken glass fiber is still a problem.This paper is based on previous testing equipment research and is to explore the basic principles of the two common glass fiber filament yarn suitable for broken glass fiber detection.The main contents and conclusions of this study are as follows:(1)To observe and summarize the common broken glass fiber filament morphology,.Three common morphological appearance of broken glass fiber filament yarn are softer hair,stiff bristles,circle hair.When glass fiber filament yarn is confined effectively by lateral pressure,itsstrength and ductility can be greatly enhanced.It is convenient and reliable toconfine concrete by glass fiber filament yarn.In practical design,an appropriateanalytic model should be given to assure reliable results.Previous modelsgenerally lead to overestimate of the strength of glass fiber filament yarn and result in unsafedesign.In this paper,experiments on 2 glass fiber filament yarn conducted.(2)The principle of projection counting method is more suitable for the detection of broken glass fiber detection.Based on test results,a bilinear stress-strain relationship model is provided,and good agreement is achieved between testresults and theoretical ones.The sign of 0,1,2,3broken glass fibers are same to the true number of broken glass fibers.Based on reported test results,a bilinear stress-strainrelationship model is provided,and good agreement is achieved between testresults and theoretical ones.(3)Based onreported test results for confined concrete,a simplified 90° analytic methodand a two-stage stress-strain relationship model is provided,and goodagreement between test and theoretical results is achieved.Almost all previous experimental study and theoretical analysis focused onconcrete columns subjected axial loading,but study on concrete columns undereccentric loading is scarce.In 10m/min detection speed,YG172 type hairiness tester can be used to detect 300tex broken glass fiber,you can select at 4mm as read points.(4)The maximum detection speed is 30m/min.In engineering practice,almost all columns subjecteccentric loading.In order to know the behavior of FRP jacketed reinforcedconcrete columns under eccentric loading,it is essential to do some specialstudy on it.In 60m/min detection speed,YG172 type hairiness tester can not be used to detect 300tex broken glass fiber,In 30m/min detection speed,YG172 type hairiness tester can be used to detect 300tex broken glass fiber.(5)In this paper,experiments on 10 full size rectangular reinforcedconcrete columns strengthened with glass fiber-Reinforced Polymer areconducted.In this test,various design parameters,such as eccentricity ratio,quantity of unidirection continuous glass-fiber sheets,space of straps andloading history,are been considered.In lOm/min detection speed,YG172 type hairiness tester can be used to detect 68tex broken glass fiber,you can select at 2mm as read points.The glass fiber filament is thinner,the better read point(1mm,2mm,3mm,4mm,5mm,6mm,7mm,8mm,9mm)is smaller.