Geers, M.G.D.

Govaert, L.E.

Lenders, T.

Pini, T.

Remmers, J.J.C.

Scipedia

8th ECCOMAS Thematic Conference on the Mechanical Response of Composites: COMPOSITES 2021MODELLING THE RATE- AND TEMPERATURE-DEPENDENTMICRO-MECHANICAL BEHAVIOUR OF CARBON FIBERREINFORCED PVDFT. Lenders1∗, J.J.C. Remmers1, T. Pini1, L.E. Govaert1 and M.G.D. Geers11 Department of Mechanical Engineering, Eindhoven University of Technology∗ t.lenders@tue.nlThe conditions to which fiber reinforced plastics (FRPs) are exposed in state of the art applica-tions are becoming more extreme, for example in the offshore oil and gas industry. Therefore,the ability to predict the long-term behaviour, and thereby identifying the failure mechanisms,of fiber reinforced plastics is of great importance. Especially under these extreme conditions,the contribution of the matrix plays an important role and a detailed description of its behaviouris required. In oil and gas applications, polyvinylidene fluoride (PVDF) is used because ofits excellent gas barrier properties. In this work the rate- and temperature-dependent micro-mechanical behaviour of carbon fiber reinforced polyvinylidene fluoride is studied.The behaviour of the composite is studied by using a micro-mechanical model that is composedof individually modelled carbon fibers embedded in a PVDF matrix. The time- and temperature-dependent behaviour of PVDF is captured by the Eindhoven Glassy Polymer (EGP) constitutivemodel [1]. This model enables the description of the intrinsic behaviour of the semi-crystallinematrix over a range of applied strain rates and temperatures using a single set of material pa-rameters. The characterization of these material parameters, requires a set of experimental dataobtained from uniaxial compression and tensile tests performed at different temperatures andapplied strain rates. To describe the material behaviour of the individually modelled carbonfibers, an elastic orthotropic material model is employed. Off-axis tensile tests of the compositeled to the observation that the interface behaviour between matrix and fiber must be incorpo-rated in the micro-mechanical model as well. Subsequently, an interface between the matrixand fiber is added to the model by using cohesive zone interface elements. The behaviour ofthese interface elements is described by an appropriate constitutive relation.It is demonstrated what influence the rate- and temperature dependence of PVDF, describedby the EGP-model, and the behaviour of the interface elements have on the micro-mechanicalresponse of the composite.References[1] L.C.A. van Breemen, T.A.P. Engels, E.T.J. Klompen, D.J.A. Senden and L.E. Govaert(2012). Rate- and temperature-dependent strain softening in solid polymers. Journal ofPolymer Science, Part B: Polymer Physics, 50(24), 1757-1771.

Modelling the Rate- and Temperature-Dependent Micro-Mechanical Behaviour of Carbon Fiber Reinforced PVDF

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Modelling the Rate- and Temperature-Dependent Micro-Mechanical Behaviour of Carbon Fiber Reinforced PVDF

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