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Date of Publication:2017-01-01

Journal:复合材料学报

Affiliation of Author(s):运载工程与力学学部

Volume:34

Issue:9

Page Number:1944-1952

ISSN No.:1000-3851

Abstract:The influence of cryogenic mediums (liquid nitrogen and liquid oxygen,LN2 and LO2 )on the mechani-cal properties of carbon fiber reinforced epoxy resin (CFs/EP)was studied.T700 carbon fibers (CFs)and CFs/EP were immersed in liquid nitrogen (LN2 )and liquid oxygen (LO2 )for 120 h.The surface elements and morphology of T700 CFs were investigated by XPS and SEM,respectively.The mechanical properties of T700 CFs and CFs/EP were also researched after immersion in LN2 and LO2 .The results show that there are obvious damages on the sur-face of T700 CFs after immersion in LN2 ,but no damages are found on the surface of T700 CFs after immersion in LO2 .The different influence of LN2 and LO2 on the surface elements of T700 CFs and single fiber tensile strength could be negligible.After immersion in LN2 and LO2 ,the tensile strength of CFs/EP decrease 15.26% and 14.38%,respectively,and the flexural strength of CFs/EP increase 56.18% and 57.81%,respectively.Conse-quently,the influence of LN2 and LO2 on the mechanical properties of CFs/EP are nearly no difference.

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