CONSTRUCTION LAYER OF TUBE FROM COMPOSITE MATERIAL Russian patent published in 2001 - IPC

FIELD: tubular articles. SUBSTANCE: constructional layer of composite-material tube is made of reinforcing material in the form of alternating monolayers with transverse and longitudinal laying of reinforcing material impregnated with, for example, thermoreactive binder. In this case, reinforcing material is laid in zigzag way in longitudinal direction. Parameters of reinforcing material structure of constructional layer of every standard size of tube and expected deviation index (Y,%) of strength of constructional layer containing cross-fibered longitudinal-transverse structure of reinforcing material relative to strength of constructional layer are connected in compliance with formulas: , where C is structural coefficient; G is numerical coefficient equal to 82.15+/-10.5% for pressure tubes; D is internal diameter of constructional layer, cm; L is base of longitudinal laying of threads; z is number of zigzag loops on circumference length of constructional layer internal diameter. EFFECT: reduced consumption of reinforcing material. 2 cl, 1 dwg, 2 tbl