TY - JOUR

T1 - Influence of Fibre Taper on the Interfacial Shear Stress in Fibre-Reinforced Composite Materials during Elastic Stress Transfer

AU - Goh, Kheng Lim

AU - Meakin, Judith Rowena

AU - Hukins, David William Laurence

PY - 2010

Y1 - 2010

N2 - The paper is concerned with finite element (FE) analysis of stress transfer from an elastic matrix to an elastic fibre, which need not be a uniform cylinder, in a fibre-reinforced composite material. Axisymmetric models of fibres embedded in co-axial cylindrical matrices were investigated by the FE method. Fibre shapes investigated were cylindrical, ellipsoidal, paraboloidal taper and conical taper. The effects of varying the fibre aspect ratio, q (ranging 200 to 3500) and Young's modulus (relative to that of the matrix), Ef/Em (ranging 103 to 106) were investigated. The results show that ellipsoidal and parabolic tapers lead to a similar distribution of interfacial shear stress (t) to that observed for a uniform cylindrical fibre, except that the magnitude of the stress is higher. For a conical taper (except for q = 200, Ef/Em = 106), the interfacial stress increases to a maximum between the centre and the end of the fibre and then decreases towards the fibre ends. The effect of fibre taper on the distribution of t values is reflected in the axial tensile stress, sz, distribution induced in a fibre. For example, for a fibre with a conical taper, the distribution of t values can lead to an even distribution of sz along the length of a fibre.

AB - The paper is concerned with finite element (FE) analysis of stress transfer from an elastic matrix to an elastic fibre, which need not be a uniform cylinder, in a fibre-reinforced composite material. Axisymmetric models of fibres embedded in co-axial cylindrical matrices were investigated by the FE method. Fibre shapes investigated were cylindrical, ellipsoidal, paraboloidal taper and conical taper. The effects of varying the fibre aspect ratio, q (ranging 200 to 3500) and Young's modulus (relative to that of the matrix), Ef/Em (ranging 103 to 106) were investigated. The results show that ellipsoidal and parabolic tapers lead to a similar distribution of interfacial shear stress (t) to that observed for a uniform cylindrical fibre, except that the magnitude of the stress is higher. For a conical taper (except for q = 200, Ef/Em = 106), the interfacial stress increases to a maximum between the centre and the end of the fibre and then decreases towards the fibre ends. The effect of fibre taper on the distribution of t values is reflected in the axial tensile stress, sz, distribution induced in a fibre. For example, for a fibre with a conical taper, the distribution of t values can lead to an even distribution of sz along the length of a fibre.

KW - tapered fibres

KW - interfacial shear stress

KW - elastic stress transfer

KW - fibre composites

U2 - 10.1163/092764409X12580201111665

DO - 10.1163/092764409X12580201111665

M3 - Article

VL - 17

SP - 74

EP - 80

JO - Composite Interfaces

JF - Composite Interfaces

SN - 0927-6440

IS - 1

ER -