Failure mechanisms in thick composites under compressive loading

被引：49

作者：

Daniel, IM ^{[1
]}

Hsiao, HM ^{[1
]}

Wooh, SC ^{[1
]}

机构：

[1] MIT,CAMBRIDGE,MA 02139

来源：

COMPOSITES PART B-ENGINEERING | 1996年 / 27卷 / 06期

关键词：

failure mechanism; thick composites; compression testing; fiber misalignment; fiber microbuckling; kink bands; compressive strength;

D O I：

10.1016/1359-8368(95)00010-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Failure mechanisms were studied in a unidirectional carbon/epoxy composite under uniform and linearly varying longitudinal compression. The first failure mechanism is shear yielding or shear failure in the matrix precipitated by initial fiber misalignment. It was shown how an initial fiber misalignment of 1.5 degrees can produce the measured compressive strength of 1725 MPa (250 ksi). Matrix failure is followed by fiber buckling and fracture, resulting in the formation of a kink band. The kink band orientation is constant in the range of beta = 20-30 degrees, whereas the kink angle alpha varies from a small initial value to a maximum value of 2 beta. Kink band widths varied between 4 and 20 fiber diameters. Kink bands can occur on different planes which can rotate along the band. Kink band multiplication or broadening with increasing stress was observed at points where the maximum kink angle alpha was reached. Copyright (C) 1996 Elsevier Science Limited

引用

页码：543 / 552

页数：10

共 32 条

[1]

Argon A. S., 1972, Treatise on Materials Science and Technology vol.1, P79

[2]

Berg C., 1973, Fibre Science and Technology, V6, P79

[3] COMPRESSIVE FAILURE OF FIBER COMPOSITES [J].