Abstract:Carbon cloth was a key material for preparing the 3D woven performs. The property of needled perform
was decided by the tensile stress of carbon cloth after needling. The tensile stress of needled carbon cloth could provide
a reference for optimizing technical parameters and improving properties of performs. The tensile stress and the factors
that affect the stress of carbon cloth were studied. Among the 3 K plain carbon cloth, the 3K twill carbon cloth and the
3K satin carbon cloth, the 3K twill carbon cloth has a high tensile stress and stress retention and shows the best techno鄄
logical properties. Under a certain process, the tensile stress of the needled carbon cloth can be simulated by a function
ofy = A1 伊e-x / t1 + y0, in which A1, t1 and y0 are constants. The needle punching density was the most important factor
that affected the tensile stress ant the stress retention percent, and the final needle punching density decided the tensile
stress. When the needle punching density was 26 n/ cm2, the stress of warp and weft direction of 3K twill carbon cloth
decreased 42. 0% and 49. 1% respectively, and when the needle punching density was 32 n/ cm2, the number was
71郾4% and 78.8%.
