The Effect of Plasticity and Crack Blunting on the Stress Distribution in Orthotropic Composite Materials

1973 ◽  
Vol 40 (3) ◽  
pp. 785-790 ◽  
Author(s):  
J. Tirosh
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Composite Materials ◽  
Stress Distribution ◽  
Plastic Zone ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Crack Blunting ◽  
Rectilinear Anisotropy ◽  
Crack Tip Blunting

A detailed study of the plasticity and crack-tip blunting effects on toughening materials with rectilinear anisotropy is presented. The most important results are the prediction of the extent of plastic zone and the nature of stress distribution produced by the blunting effect in the tensile mode. The analysis was confirmed experimentally and numerically (finite-element method) on a unidirectional fiber-reinforced composite.

Micromechanics Damage Analysis in Fiber-Reinforced Composite Material Using Finite Element Method

2012 ◽  
Vol 525-526 ◽  
pp. 541-544
Author(s):  
Cha Yun Kimyong ◽  
Sontipee Aimmanee ◽  
Vitoon Uthaisangsuk ◽  
Wishsanuruk Wechsatol
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Volume Fraction ◽  
Matrix Material ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Damage Initiation ◽  
Reinforced Composite ◽  
Wide Range ◽  
Element Method

Fiber-reinforced composite materials (FRC) are used in a wide range of applications, since FRC exhibits higher strength-to-density ratio in comparison to traditional materials due to long fibers embedded in a matrix material. Failures occurred in FRC components are complicated because of the interaction of the constituents. The aim of this study is to investigate damage behavior in a unidirectional glass fiber-reinforced epoxy on both macro-and micro-levels by using finite element method. The Hashins criterion was applied to define the onset of macroscopic damage. The progression of the macroscopic damage was described using the Matzenmiller-Lubliner-Taylor model that was based on fracture energy dissipation of material. To examine the microscopic failure FE representative volume elements consisting of the glass fibers surrounded by epoxy matrix with defined volume fraction was considered. Elastic-brittle isotropic behaviour and the Coulomb-Mohr criterion were applied for both fiber and epoxy. The results of the macroscopic and microscopic analyses were correlated. As a result, damage initiation and damage development for the investigated FRC could be predicted.

Enhancement of Thermal Conductivities in Polymeric Fiber Reinforced Composite Materials

1992 ◽  
Vol 114 (4) ◽  
pp. 416-421 ◽  
Author(s):  
F. Gordaninejad
Keyword(s):  
Finite Element ◽  
Composite Materials ◽  
Three Dimensional ◽  
Pulse Method ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Three Dimensional Finite Element ◽  
Polymeric Fiber ◽  
Thermal Conductivities

In this study it is demonstrated that thermal conductivities of polymeric fiber-reinforced composite materials can be enhanced by using coated fibers and by adding thermally conductive microspheres to the resin. Two and three-dimensional finite element unit cell models are developed to predict the directional thermal conductivities. The analyses are based on the flash pulse method. It is found that the thermal conductivities in the longitudinal and the transverse directions are highly dependent on the fiber and microsphere volume fractions as well as on the thermal conductivities of fiber, microsphere, and coatings. It is shown that the 2-D analysis is a good approximation for the 3-D model. Close agreements among analytical, finite element and experimental results are obtained.

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