Finite element analysis model of the cumulative damage failure process in a continuous-fibre ceramic composite loaded in flexure

Abstract

A finite element analysis (FEA) using macro-based input commands was used to model the cumulative damage failure process of a continuous-fibre ceramic composite loaded in flexure. The modelling was predicated by the subject material which exhibited asymmetric stress-strain response for uniform uniaxial monotonic tensile and compressive loading. The FEA model of the prismatic rectangular flexural beam was composed of separately meshed fibre and matrix elements loaded in four point flexure. The cumulative damage process was modelled using a macro-based input code combined with an element ‘kill’ command that was used to change the stiffnesses of those fibre and matrix elements whose respective ultimate tensile strengths were exceeded by the resulting tensile stresses. Matrix elements were allowed to support compressive stresses up to the ultimate compressive strength of the matrix material. However, unsupported fibre elements (i.e. those coincident with ‘killed’ matrix elements) were not allowed to support compression. Even though the model did not explicitly include the behaviour of the interphase material, good agreement between the FEA results and experimental test results was found for the subject three-dimensionally braided Nicalon^TM fibre-reinforced β-SiC matrix composite.

Keywords

ceramic composite cumulative damage flexural loading finite element analysis (FEA) model

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References

Carruthers

Lindberg

Critical issues for ceramics for gas turbines. In Proceedings of the Third International Symposium on

Ceramic Components and Materials for Engines (Ed. Tennery

V. J.

), 1988, pp. 1258–1272 (American Ceramics Society, Westerville, Ohio).

Rice

R. W.

Mechanisms of toughening of ceramic matrix composites

Ceram. Engng Sci. Proc., 1981, 2 (7–8), 661–701.

Donald

I. W.

McMillan

P. W.

Review: Ceramic matrix composites

J. Mater. Sci., 1976, 11, 949–972.

Ohji

Yamauchi

Kanematsu

Ito

Tensile rupture strength and fracture defects of sintered silicon carbide

J. Am. Ceram. Soc., 1989, 72 (4), 688–690.

Jenkins

M. G.

Mello

M. D.

Fabrication, processing and characterization of braided, continuous SiC fibre reinforced/CVI matrix composites

Mater. Mfg Processes, 1996, 11 (1), 99–118.

Karnitz

M. A.

Craig

D. F.

Richlen

S. L.

Continuous fibre ceramic composite program

Ceram. Bull., 1991, 70 (30), 430–435.

Prewo

K. M.

Brennan

J. J.

High-strength silicon carbide fibre-reinforced glass-matrix composites

J. Mater. Sci., 1980, 15, 463–468.

Marshall

D. B.

Evans

A. G.

Failure mechanisms in ceramic fibre/ceramic matrix composites

J. Am. Ceram. Soc., 1985, 68 (5), 225–231.

Sbaizero

Evans

A. G.

Tensile and shear properties of laminated ceramic matrix composites

J. Am. Ceram. Soc., 1986, 69 (6), 481–487.

10.

Inghels

Lamon

An approach to the mechanical behaviour of SiC/SiC and C/SiC ceramic matrix composites

J. Mater. Sci., 1991, 26, 5403–5410, 5411–5419.

11.

Gonczy

S. T.

Jenkins

M. G.

Tensile and flexure properties and performance of 2-D Nicalon^TM reinforced Sylramic^TM ceramic matrix composites. In Mechanical, Thermal, and Environmental Testing and Performance of Ceramic Composites and Components. ASTM STP 1392, 2000, pp. 86–106 (American Society for Testing and Materials, West Conshohocken, Pennsylvania).

12.

Jenkins

M. G.

Standards and codes for ceramic matrix composites

Advd Composite Mater., 1999, 8 (1), 55–76.

13.

Steif

P. S.

Trojnacki

Bend strength versus tensile strength of fibre-reinforced ceramics

J. Am. Ceram. Soc., 1994, 77 (1), 221–229.

14.

Folsom

C. A.

Zok

F. W.

Lange

F. F.

Flexural properties of brittle multilayer materials. 1: Modeling

J. Am. Ceram. Soc., 1994, 77 (3), 689–696.

15.

Raghuraman

Lara-Curzio

Ferber

M. K.

Modeling of flexural behaviour of continuous fibre ceramic composites

Ceram. Engng Sci. Proc., 1996, 17 (4–5), 147–156.

16.

Zhang

Sikarskie

D. L.

On the technique of generating stress-strain curves for flexural data

J. Composite Mater., 1996, 30 (9), 966–983.

17.

Cook

R. D.

Finite Element Modeling for Stress Analysis, 1995 (John Wiley, New York).

18.

Mark

K. Y.

Numerical modeling of the mechanical behavior of a continuous fibre ceramic composite in flexure. MS thesis, University of Washington, 1996.

19.

Munson

K. L.

Retained tensile strengths of oxide/oxide and non-oxide/oxide continuous fibre ceramic composites after high temperature exposure to air. MS thesis, University of Washington, 1995.