scholarly journals Discussion: “Mechanics of Fatigue Damage and Degradation in Random Short-Fiber Composites: Part II—Analysis of Anisotropic Property Degradation” (Wang, S. S., Chim, E. S.-M. and Suemasu, H., 1986, ASME J. Appl. Mech., 53, pp. 347–353)

1987 ◽  
Vol 54 (2) ◽  
pp. 479-480 ◽  
Author(s):  
S. Nemat-Nasser
Keyword(s):  
Fatigue Damage ◽  
Fiber Composites ◽  
Short Fiber ◽  
Anisotropic Property

Mechanics of Fatigue Damage and Degradation in Random Short-Fiber Composites, Part II—Analysis of Anisotropic Property Degradation

1986 ◽  
Vol 53 (2) ◽  
pp. 347-353 ◽  
Author(s):  
S. S. Wang ◽  
E. S.-M. Chim ◽  
H. Suemasu
Keyword(s):  
Fatigue Damage ◽  
Fiber Composite ◽  
Fiber Composites ◽  
Short Fiber ◽  
Distribution Functions ◽  
Cumulative Distribution ◽  
Stiffness Degradation ◽  
Microcrack Density ◽  
Loading Cycle ◽  
Anisotropic Stiffness

Based on the microcrack density and cumulative distribution functions obtained in (Wang et al., 1986), cyclic fatigue degradation and associated damage-induced anisotropy of elastic properties of random short-fiber composites are studied. Constitutive equations of the fatigue-damaged composite are derived on the basis of the well-known self-consistent mechanics scheme in conjunction with a three-dimensional elliptic crack theory and the probabilistic functions of microcrack density and cumulative distribution. The anisotropic stiffness degradation is determined as a function of microcrack evolution and accumulation in the damaged composite. Theoretical predictions and experimental data of effective modulus decay during fatigue are in excellent agreement. A damage parameter is introduced to depict quantitatively the degree of homogeneous fatigue damage. The tensorial nature of anisotropic stiffness degradation and fatigue damage is examined in detail. A power-law relationship is established between the rate of damage development and the fatigue loading cycle. The rate of fatigue damage growth is found to decrease exponentially with the loading cycle — a phenomenon unique to the random short-fiber composite. The fundamental mechanics of composite fatigue damage and associated property degradation is elucidated in this paper.

Mechanics of Fatigue Damage and Degradation in Random Short-Fiber Composites, Part I—Damage Evolution and Accumulation

1986 ◽  
Vol 53 (2) ◽  
pp. 339-346 ◽  
Author(s):  
S. S. Wang ◽  
E. S.-M. Chim ◽  
H. Suemasu
Keyword(s):  
Fatigue Damage ◽  
Damage Evolution ◽  
Fiber Composite ◽  
Cyclic Fatigue ◽  
Fiber Composites ◽  
Short Fiber ◽  
Distribution Functions ◽  
Cumulative Distribution ◽  
Orientation Density ◽  
Short Fiber Composite

Cyclic fatigue damage in random short-fiber composites is studied experimentally and analytically. In the experimental phase of the study, the fatigue damage is observed to involve various forms of microcracking, originated from microscopic stress concentrators in the highly heterogeneous microstructure. In the analytical portion of the study, a probabilistic treatment of the microcracks is conducted to evaluate the statistical nature of the microscopic fatigue damage. The density and the cumulative distribution of microcrack lengths are found to follow the well known Weibull-form function, and the microcrack orientation density and cumulative distribution have expressions of a fourth-order power form of the cosθ function. Fatigue damage evolution and accumulation in the random short-fiber composite are analyzed in detail through the development of probabilistic microcrack density and distribution functions during the cyclic loading history.

Characterization of orientation clustering in short-fiber composites

1990 ◽  
Vol 28 (13) ◽  
pp. 2651-2672 ◽  
Author(s):  
Sridhar Ranganathan ◽  
Suresh G. Advani
Keyword(s):  
Fiber Composites ◽  
Short Fiber

scholarly journals Fatigue damage analysis of aluminized glass fiber composites

2005 ◽  
Vol 407 (1-2) ◽  
pp. 1-6 ◽  
Author(s):  
J.M. Ferreira ◽  
J.T.B. Pires ◽  
J.D. Costa ◽  
Z.Y. Zhang ◽  
O.A. Errajhi ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Fatigue Damage ◽  
Fiber Composites ◽  
Damage Analysis ◽  
Glass Fiber Composites ◽  
Fatigue Damage Analysis
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