A micromechanical model of tension-softening and bridging toughening of short random fiber reinforced brittle matrix composites

A plastic-damage constitutive model for the finite element analysis of fibre reinforced concrete

“…The underlying failure mechanism of cementitious composites, reinforced with randomly oriented discontinuous fibres, is also largely governed by fibre pull-out. This may or may not be accompanied by fibre rupture, depending on the fibre geometry and fibre-cement matrix interface properties [1][2][3]. When a crack opens, the fibres crossing the crack plane begin to debond and are subsequently pulled out (i.e.…”

“…Several models that describe the pull-out of randomly distributed short fibres from a cementitious matrix have been proposed [1,2,[4][5][6][7]. Naaman et al [4,5] investigated the influence of fibre-matrix bond properties on the behaviour of FRCCs using an analytical model, since it had become apparent from experimental investigations that the behaviour of FRC, particularly in the post-cracking stage, was strongly influenced by the interfacial bond-slip response.…”

“…Assuming a linear-elastic -constant frictional bond-slip relationship they formulated a model that describes the whole pull-out process of a single fibre aligned with the pull-out force. Li et al [1], Li [2] and Lin and Li [7] derived a series of closed form analytical solutions that describe the pull-out of fibres that have 3-D uniform random distributions in location and orientation relative to the matrix crack plane. In these contributions, Li and co-workers considered a number of assumptions for the fibrematrix bond model, including constant interface shear stress (pure frictional behaviour) [2] or slipweakening [1] and slip-hardening behaviour [1,7].…”

“…Li et al [1], Li [2] and Lin and Li [7] derived a series of closed form analytical solutions that describe the pull-out of fibres that have 3-D uniform random distributions in location and orientation relative to the matrix crack plane. In these contributions, Li and co-workers considered a number of assumptions for the fibrematrix bond model, including constant interface shear stress (pure frictional behaviour) [2] or slipweakening [1] and slip-hardening behaviour [1,7]. The pull-out behaviour of steel hooked-end fibres has been addressed by Zhan and Meschke [8] who proposed an analytical model in which the anchorage effects induced by the hooks are evaluated at key pull-out stages.…”

The Model of Brittle Matrix Composites for Distribution of Steel Fibres / Plieninių Fibrų Pasiskirstymo Kompozituose Su Trapiomis Matricomis Modelis

“…Within the period of more than 130 years of applying similar types of composites in civil engineering, many authors made attempts to describe fibre distribution in composite space (Krenchel 1975;Soroushian, Lee 1990;Li et al 1991;Stroeven 1991;Kooiman 2000) which is a complex problem due to the fact that real fibre orientation to composite space remains unknown. Fibres are oriented to various angles considering different distances between them and mould walls.…”