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Title: Numerical simulation of ram extrusion in short-fiber-reinforced fresh cementitious composites
Authors: Zhou, X
Li, Z
Keywords: Elastoviscoplastic;Constitutive model;Rheology;Strain rate;Fiber-reinforced;Fresh cementitious composite;Ram extrusion;Overstress;Rate-dependent;Flow stress;LS-DYNA
Issue Date: 2009
Publisher: Mathematical Sciences Publishers
Citation: Journal of Mechanics of Materials and Structures, 4(10), 1755 - 1769, 2009
Abstract: A series of ram extrusion tests was carried out on a short-fiber-reinforced, semisolid, fresh cementitious composite. An elastoviscoplastic constitutive model is proposed for the extrudable fresh cementitious composite. It features the associative flow rule, a nonlinear strain rate-hardening law, and the von Mises yield criterion. The model is then implemented in ANSYS/LS-DYNA explicit finite element code. Various ram extrusion processes of the fresh cementitious composite were simulated. It has been found that the extrusion load versus imposed displacement predictions agree well with the experimental results. The fresh paste flow, through the die entry and the die-land, is then interpreted in light of the evolution of the deformation and distribution of state variables, mainly based on numerical results and the ram extrusion mechanism. The effects of extrusion ratio and extrusion velocity on extrusion load are also investigated, based on the mechanical properties of the fresh cementitious composite. The study indicates that the numerical procedure established, together with the constitutive model proposed, is applicable for describing ram extrusion of short-fiber-reinforced fresh cementitious composites, which might provide a numerical rheometric tool from which ram extrusion of elastoviscoplastic paste-like materials can be examined and quantified.
Description: This is the author's accepted manuscript. The final published article is available from the link below. First published in JoMMS in 4(10), 2009, published by Mathematical Sciences Publishers.
ISSN: 1559-3959
Appears in Collections:Mechanical and Aerospace Engineering
Dept of Mechanical Aerospace and Civil Engineering Research Papers

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