Study on damage evolution and bearing capacity of basalt fiber wound pipeline
Basalt fiber reinforced composite(BFRP)has the advantages of strong corrosion resistance,high specific strength and environmental protection.The correct evaluation of the reliability and bearing capacity of BFRP pipeline is the basis for its application in the field of high value-added oil and gas transportation.For composite pipes wound by the basalt fiber(BF),the strength of impregnated fiber bundles is obtained on a meso scale firstly.Then,both axial and circumferential specimens were cut from a pipe and the tensile strength of the two kinds of specimens were measured.Based on both experimental measurement and finite element simulation,damage evolution of structure layers of the pipe wall was studied under conditions of tension,compression and shearing,and the constitutive model of the structure layer is obtained.Finally,a finite element model of the BF-wound composite pipe was established,and influences of fiber performances on the pipe's carrying capacity were studied.It is shown that the effective fiber content exerts a great influence on the bearing capacity of the pipe.It is important to reduce the dispersion of fiber reinforcement from aspects such as fiber production and pipe forming process for predicting load-bearing reliability accurately and promoting BF composites application in oil and gas pipeline field.
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