scholarly journals An Energy Approach to a Micromechanics Model Accounting for Nonlinear Interface Debonding

2005 ◽  
Author(s):  
Henry Tan ◽  
Young Huang ◽  
Philippe Geubelle ◽  
Cheng Liu ◽  
Michael Breitenfeld
Keyword(s):  
Energy Approach ◽  
Interface Debonding ◽  
Micromechanics Model ◽  
Nonlinear Interface

scholarly journals The uniaxial tension of particulate composite materials with nonlinear interface debonding

2007 ◽  
Vol 44 (6) ◽  
pp. 1809-1822 ◽  
Author(s):  
H. Tan ◽  
Y. Huang ◽  
C. Liu ◽  
G. Ravichandran ◽  
H.M. Inglis ◽  
...  
Keyword(s):  
Composite Materials ◽  
Uniaxial Tension ◽  
Particulate Composite ◽  
Interface Debonding ◽  
Nonlinear Interface

On micromechanics approach to stiffness and strength of unidirectional composites

2018 ◽  
Vol 38 (4) ◽  
pp. 167-196 ◽  
Author(s):  
Zheng-Ming Huang
Keyword(s):  
Dominant Role ◽  
Tensile Load ◽  
Unidirectional Composite ◽  
Internal Stresses ◽  
Interface Debonding ◽  
Fiber Volume ◽  
Unidirectional Composites ◽  
Micromechanics Model ◽  
Transverse Tensile ◽  
Matrix Properties

The purposes of this paper are sixfold. First, any micromechanics model for predicting elastic property (stiffness) of a composite is applicable to a reasonable prediction of a composite strength, provided that the homogenized internal stresses in the matrix are converted into true values. The conversion for all of the stress components free of biaxially transverse loads is presented in the paper. Second, the predictability of 12 well-known micromechanics models for stiffness and strength of a unidirectional composite is assessed against the measured data of all of the nine unidirectional composites used in three world-wide failure exercises. An accuracy ranking is made accordingly. Third, it is demonstrated that the smallest fiber volume in a representative volume element for a finite element approach plays a more dominant role than other issues such as a random fiber array to achieve the highest simulation accuracy. This feature has been largely ignored in the current literature. Fourth, a consistency of a micromechanics model in calculating the internal stresses in the fiber and matrix of the composite is an issue that should be taken into account. Among the 12 models considered, only Bridging Model is consistent. A non-consistency implies that a full three-dimensional approach should be used to predict an effective property of the composite even though it is subjected to a uniaxial load. Fifth, an effective method to detect an interface debonding between the fiber and matrix subjected to an arbitrary load is presented in the paper. Only a transverse tensile strength of the composite, in addition to the original fiber and matrix properties, is needed. Whereas essentially any load can cause the interface to debond earlier before a composite failure, only a transverse tensile load carrying capacity of the composite is influenced significantly by the debonding. Specifically, an interface debonding has insignificant effect on a shear strength of the composite. Sixth, a fiber misalignment-induced kink band failure is analyzed by virtue of the original fiber and matrix properties, and a longitudinal compressive strength is predicted micromechanically.

Microstructural Evaluation of Silicon Carbide Whisker Reinforced Alumina Fabricated with Carbon-Coated Whiskers

1991 ◽  
Vol 49 ◽  
pp. 920-921
Author(s):  
K. B. Alexander ◽  
P. F. Becher
Keyword(s):  
Silicon Carbide ◽  
High Resolution Electron Microscopy ◽  
Ceramic Composites ◽  
Interface Debonding ◽  
Resolution Electron ◽  
Microstructural Evaluation ◽  
Carbon Coated ◽  
Electron Energy Loss ◽  
Interfacial Films ◽  
Debonding Process

The presence of interfacial films at the whisker-matrix interface can significantly influence the fracture toughness of ceramic composites. The film may alter the interface debonding process though changes in either the interfacial fracture energy or the residual stress at the interface. In addition, the films may affect the whisker pullout process through the frictional sliding coefficients or the extent of mechanical interlocking of the interface due to the whisker surface topography.Composites containing ACMC silicon carbide whiskers (SiCw) which had been coated with 5-10 nm of carbon and Tokai whiskers coated with 2 nm of carbon have been examined. High resolution electron microscopy (HREM) images of the interface were obtained with a JEOL 4000EX electron microscope. The whisker geometry used for HREM imaging is described in Reference 2. High spatial resolution (< 2-nm-diameter probe) parallel-collection electron energy loss spectroscopy (PEELS) measurements were obtained with a Philips EM400T/FEG microscope equipped with a Gatan Model 666 spectrometer.

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