Abstract
A computationally-efficient numerical approach to treating matrix nonlinearity in ceramic matrix composite components has been developed and validated. The model employs a dual mesh comprising strings of line elements that represent the fiber tows and 3D effective medium elements that define the external geometry and embody the matrix-dominated properties. Validation addressed test data for unnotched and open-hole tension specimens. For these tests, the onset of nonlinearity and subsequent plasticity due to matrix microcracking and interfacial debonding and sliding are satisfactorily represented by a linear Drucker-Prager model for failure initiation in the effective medium along with a fully-associated flow rule with isotropic, perfectly-plastic flow. Composite failure is assumed to be correlated with the maximum local stress averaged over a gauge volume dictated by the fiber tow width. Using one set of specimens for calibration, very good predictions of the nonlinear stress-strain response and ultimate strength of other specimens are obtained.
| Original language | English |
|---|---|
| Pages (from-to) | 222-229 |
| Number of pages | 8 |
| Journal | Composites Part A: Applied Science and Manufacturing |
| Volume | 41 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 1 2010 |
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Keywords
- A. Ceramic-matrix composites (CMCs)
- B. Fracture
- B. Stress concentrations
- C. Finite element analysis (FEA)
ASJC Scopus subject areas
- Ceramics and Composites
- Mechanics of Materials
Cite this
Treating matrix nonlinearity in the binary model formulation for 3D ceramic composite structures. / Flores, Shane; Evans, Anthony G.; Zok, Frank W.; Genet, Martin; Cox, Brian; Marshall, David; Sudre, Olivier; Yang, Qingda.
In: Composites Part A: Applied Science and Manufacturing, Vol. 41, No. 2, 01.02.2010, p. 222-229.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Treating matrix nonlinearity in the binary model formulation for 3D ceramic composite structures
AU - Flores, Shane
AU - Evans, Anthony G.
AU - Zok, Frank W.
AU - Genet, Martin
AU - Cox, Brian
AU - Marshall, David
AU - Sudre, Olivier
AU - Yang, Qingda
PY - 2010/2/1
Y1 - 2010/2/1
N2 - A computationally-efficient numerical approach to treating matrix nonlinearity in ceramic matrix composite components has been developed and validated. The model employs a dual mesh comprising strings of line elements that represent the fiber tows and 3D effective medium elements that define the external geometry and embody the matrix-dominated properties. Validation addressed test data for unnotched and open-hole tension specimens. For these tests, the onset of nonlinearity and subsequent plasticity due to matrix microcracking and interfacial debonding and sliding are satisfactorily represented by a linear Drucker-Prager model for failure initiation in the effective medium along with a fully-associated flow rule with isotropic, perfectly-plastic flow. Composite failure is assumed to be correlated with the maximum local stress averaged over a gauge volume dictated by the fiber tow width. Using one set of specimens for calibration, very good predictions of the nonlinear stress-strain response and ultimate strength of other specimens are obtained.
AB - A computationally-efficient numerical approach to treating matrix nonlinearity in ceramic matrix composite components has been developed and validated. The model employs a dual mesh comprising strings of line elements that represent the fiber tows and 3D effective medium elements that define the external geometry and embody the matrix-dominated properties. Validation addressed test data for unnotched and open-hole tension specimens. For these tests, the onset of nonlinearity and subsequent plasticity due to matrix microcracking and interfacial debonding and sliding are satisfactorily represented by a linear Drucker-Prager model for failure initiation in the effective medium along with a fully-associated flow rule with isotropic, perfectly-plastic flow. Composite failure is assumed to be correlated with the maximum local stress averaged over a gauge volume dictated by the fiber tow width. Using one set of specimens for calibration, very good predictions of the nonlinear stress-strain response and ultimate strength of other specimens are obtained.
KW - A. Ceramic-matrix composites (CMCs)
KW - B. Fracture
KW - B. Stress concentrations
KW - C. Finite element analysis (FEA)
UR - http://www.scopus.com/inward/record.url?scp=72049083479&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=72049083479&partnerID=8YFLogxK
U2 - 10.1016/j.compositesa.2009.10.020
DO - 10.1016/j.compositesa.2009.10.020
M3 - Article
AN - SCOPUS:72049083479
VL - 41
SP - 222
EP - 229
JO - Composites - Part A: Applied Science and Manufacturing
JF - Composites - Part A: Applied Science and Manufacturing
SN - 1359-835X
IS - 2
ER -