Influence of applied in-plane strain on transverse thermal conductivity of \(0^\circ /90^\circ \) and plain weave ceramic matrix composites. (English) Zbl 1236.74070
Summary: A computationally economic finite-element-based stress analysis model, developed previously by the authors, has been extended to predict the thermal behaviour of ceramic matrix composites with strain-induced damage. The finite element analysis utilises a solid element to represent a homogenised orthotropic medium of a heterogeneous uni-directional tow. The non linear multi-axial strain dependent thermal behaviour has been discretised by multi-linear curves, which have been implemented by a user defined subroutine, USDFLD, in the commercial finite element package, ABAQUS. The model has been used to study the performance of two CMC composites: a SiC (Nicalon) fibre-calcium aluminosilicate (CAS) matrix, \(0^\circ /90^\circ \) cross-ply laminate Nicalon-CAS; and, carbon fibre-dual carbon-SiC matrix (C/C-SiC), plain weave laminate DLR-XT. The global through-thickness thermal conductivity degradation with composite uni-axial strain has been predicted. Comparisons have been made between the predictions and experimental data for both materials, and good agreement has been achieved. For the Nicalon-CAS \(0^\circ /90^\circ \) cross-ply the dominant mechanism of thermal conductivity degradation is combined fibre failure and associated wake debonding; and, for the DLR-XT plain weave the same mechanisms act in combination with out-of-plane shear failure.
MSC:
| 74F05 | Thermal effects in solid mechanics |
| 74E30 | Composite and mixture properties |
| 80A20 | Heat and mass transfer, heat flow (MSC2010) |
Keywords:
ceramic matrix composites; tows; unit cell; 0; 90 uni-directional and woven composites; thermal conductivity degradation; orthotropic materialSoftware:
ABAQUSReferences:
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