EFFECT OF IMPERFECT INTERFACE ON THERMAL STRESSES-ASSISTED MATRIX CRACKING IN FIBER COMPOSITES

2002 ◽  
Vol 25 (6) ◽  
pp. 585-599 ◽  
Author(s):  
Y. Liu ◽  
A. Mioduchowski ◽  
C. Q. Ru
Keyword(s):  
Thermal Stresses ◽  
Fiber Composites ◽  
Imperfect Interface ◽  
Matrix Cracking

A Mechanistic Approach to Matrix Cracking Coupled with Fiber–Matrix Debonding in Short-Fiber Composites

2005 ◽  
Vol 127 (3) ◽  
pp. 337-350 ◽  
Author(s):  
Ba Nghiep Nguyen ◽  
Brian J. Tucker ◽  
Mohammad A. Khaleel
Keyword(s):  
Damage Mechanics ◽  
Fiber Composite ◽  
Fiber Composites ◽  
Short Fiber ◽  
Matrix Cracking ◽  
Element Analysis ◽  
Pull Out ◽  
Stiffness Reduction ◽  
Mechanistic Approach ◽  
Fiber Matrix

A micro–macro mechanistic approach to damage in short-fiber composites is developed in this paper. At the microscale, a reference aligned fiber composite is considered for the analysis of the damage mechanisms such as matrix cracking and fiber–matrix debonding using the modified Mori–Tanaka model. The associated damage variables are defined, and the stiffness reduction law dependent on these variables is established. The stiffness of a random fiber composite containing random matrix microcracks and imperfect interfaces is then obtained from that of the reference composite, which is averaged over all possible orientations and weighted by an orientation distribution function. The macroscopic response is determined using a continuum damage mechanics approach and finite element analysis. Final failure resulting from saturation of matrix microcracks, fiber pull-out and breakage is modeled by a vanishing element technique. The model is validated using the experimental results found in literature as well as the results obtained for a random chopped fiber glass–vinyl ester system. Acoustic emission techniques were used to quantify the amount and type of damage during quasi-static testing.

Oxidation Thermo-Mechanical and Novel Lattice-Gas Particle Deposition Modeling Aspects in Plasma Spraying of Ti-6Al-4V/SiC Fiber Composites

1998 ◽  
Author(s):  
E. Cochelin ◽  
F. Borit ◽  
G. Frot ◽  
M. Jeandin ◽  
L. Decker ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Particle Deposition ◽  
Lattice Gas ◽  
Thermal Stresses ◽  
Fiber Composites ◽  
Fiber Array ◽  
Sic Fiber ◽  
Diffusion Phenomena ◽  
Deposition Modeling ◽  
High Level

Abstract Plasma spraying is known to be one of the main promising processes for the manufacturing of Ti/SiC long fiber composites. However, some improvements remain to be done for this process to be applied in a routine industrial route. These include : oxygen contamination of the sprayed material through that of Ti particles before and during spraying ; damaging of fibers due to a high level of thermal stresses induced at the spraying stage; adequate deposition of Ti-based powder to achieve a low-porosity matrix and good impregnation of the fiber array. This contribution deals with work in the 3 previously mentioned fields, which resulted in a whole 3-fold study of the process. Oxidation was studied using electron microprobe analysis of elementary particles quenched and trapped into a closed box at various given flight distances. Oxygen diffusion phenomena within the particles are discussed from a preliminary theoretical approach coupled with experimental data. Isothermal and thermo-mechanical calculations were made using ABAQUS® code to determine stresses arising from contact of a liquid Ti-6A1-4V particle onto a SiC fiber. On a higher scale, i.e. that of the sprayed powder flow, a 2-dimensional original model simulating the deposition of droplets onto a substrate was developed. This model is based on a lattice-gas automaton which reproduces the hydrodynamical behavior of fluids.

The mechanics of matrix cracking in brittle-matrix fiber composites

1985 ◽  
Vol 33 (11) ◽  
pp. 2013-2021 ◽  
Author(s):  
D.B. Marshall ◽  
B.N. Cox ◽  
A.G. Evans
Keyword(s):  
Fiber Composites ◽  
Matrix Cracking ◽  
Brittle Matrix

A model for matrix cracking in short fiber composites

1993 ◽  
Vol 30 (12) ◽  
pp. 1701-1713 ◽  
Author(s):  
Gunay Anlas ◽  
Michael H. Santare
Keyword(s):  
Fiber Composites ◽  
Short Fiber ◽  
Matrix Cracking

Progressive damage modelling and experimental investigation of three-dimensional orthogonal woven composites with tilted binder

2019 ◽  
Vol 50 (1) ◽  
pp. 70-97 ◽  
Author(s):  
Wei Tao ◽  
Ping Zhu ◽  
Di Wang ◽  
Changhu Zhao ◽  
Zhao Liu
Keyword(s):  
Carbon Fiber ◽  
Three Dimensional ◽  
Fiber Composites ◽  
Unit Cell ◽  
Matrix Cracking ◽  
Woven Composites ◽  
Carbon Fiber Composites ◽  
Progressive Damage ◽  
Damage Initiation ◽  
3D Orthogonal Woven

This paper investigates the tensile properties of 3D orthogonal woven carbon fiber composites with tilted binder by experiment and simulation. The tensile failure strain and fracture mode of this composite show distinguished discrepancy with idealized 3D orthogonal woven composites experimentally. In order to explain this specific failure mechanism, a unit cell finite element model incorporated with damage models of constituents is established to reproduce the damage initiation and propagation of 3D orthogonal woven composites with tilted binder during tensile test. A three-dimensional failure criterion based on Hashin's criterion and Pinho's criterion is utilized to describe the progressive damage of yarns, while the non-linear behavior of the matrix is predicted by Drucker-Prager yield criterion. Besides, a traction-separation law is applied to predict the damage of yarn-matrix interface. The proposed unit cell model is correlated and validated by global stress–strain curves, DIC full-field strain distributions and modulus history curve. The damage evolution process of 3D orthogonal woven carbon fiber composites with tilted binder, including fiber tow failure, matrix cracking, and interfacial debonding, is recorded and investigated by the modulus history curve from simulation.

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