scholarly journals Modeling of Damage Evolution of Fiber-Reinforced Composite Structure

2020 ◽  
Author(s):  
Muhammad Bilal Afzal
Keyword(s):  
Failure Mode ◽  
Damage Mechanics ◽  
Elastic Fiber ◽  
Fiber Reinforced ◽  
Irreversible Damage ◽  
Fiber Failure ◽  
Fiber Reinforced Composite ◽  
Failure Modeling ◽  
Mechanics Model ◽  
Reinforced Composite

This chapter is the result of a study of many special disciplines, such as damage of matrix, cracking, interface, debonding, and fiber failure. A damage mechanics model is presented to characterize brittle failure in elastic fiber-reinforced composite materials. During the life of the aircraft, cracks and damage can occur in aviation structures that should be analyzed to determine the decrease in stiffness and resistance due to the presence of the cracks. Theoretical and numerical problems related to intralaminar and interlaminar failure modeling are very well discussed. The formulations of the constitutive models presented in this chapter support the Continuum Damage Mechanics (CDM) approach and enable the control of energy dissipation in relation to each failure mode, regardless of the refinement of the network and the orientation of the fracture plane. In context to CDM, internal thermodynamic irreversible damage variables are defined to quantify the damage concentration in relation to each possible failure mode and to predict the gradual reduction in stiffness for each bond layer. Numerical examples are provided to possibly explain the capabilities of the model.

On the Properties of Anisotropic Piezoelectric and Fiber Reinforced Composite Materials

2006 ◽  
Author(s):  
Mohamed Gaith ◽  
Cevdet Akgoz
Keyword(s):  
Composite Materials ◽  
Elastic Fiber ◽  
Physical Property ◽  
Ceramic Materials ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Semiconductor Compounds ◽  
Degree Of Anisotropy ◽  
Tensor Basis

A new procedure based on constructing orthonormal tensor basis using the form-invariant expressions which can easily be extended to any tensor of rank n. A new decomposition, which is not in literature, of the stress tensor is presented. An innovational general form and more explicit physical property of the symmetric fourth rank elastic tensors is presented. The new method allows to measure the stiffness and piezoelectricity in the elastic fiber reinforced composite and piezoelectric ceramic materials, respecively, using a proposed norm concept on the crystal scale. This method will allow to investigate the effects of fiber orientaion, number of plies, material properties of matrix and fibers, and degree of anisotropy on the stiffness of the structure. The results are compared with those available in the literature for semiconductor compounds, piezoelectric ceramics and fiber reinforced composite materials.

scholarly journals Study On The Formation Mechanism of Cutting Surface of Carbon Fiber Reinforced Composites

2021 ◽  
Author(s):  
Fei Su ◽  
Chunjie Li ◽  
Guojun Dong ◽  
Lei Zheng ◽  
Bing Chen
Keyword(s):  
Carbon Fiber ◽  
Failure Mode ◽  
Fiber Orientation ◽  
Fiber Reinforced ◽  
Cutting Mechanism ◽  
Machined Surface ◽  
Fiber Failure ◽  
Cutting Mechanics ◽  
Mechanics Model ◽  
Carbon Fiber Reinforced

Abstract Carbon fiber-reinforced plastic (CFRP) is used widely in aerospace. The cutting mechanism of CFRP is markedly different from that of metals due to anisotropic and non-homogeneous material structure. The cutting mechanisms are highly dependent on the fiber orientation. The quality of the machined surface can be affected by the fiber fracture models. In this paper, based on the elastic foundation beam theory and the Hertzian contact theory, the cutting mechanics are established. And the cutting model is simulated by the three-dimensional micro-scale numerical model. Then, the continuous varying cutting mechanism and the sub-damage are deeply studied in detail by combining the cutting mechanics model and the simulation model. The results indicate that the fiber orientation θ=80° and θ=150° is the transition critical point of the fracture form. When θ=0°, the fiber failure mode is buckling-dominated. When 0°<θ<80° and 150°<θ<180°, the fiber failure mode is dominated by contact fracture. When 80°<θ<150°, the fiber failure mode is bending-dominated. The cutting mechanics model and finite element model can effectively reflect the evolution law of CFRP machined surface.

Damage mechanics and load failure of fiber-reinforced composite fixed partial dentures

2005 ◽  
Vol 21 (12) ◽  
pp. 1104-1110 ◽  
Author(s):  
Scott R. Dyer ◽  
John A. Sorensen ◽  
Lippo V.J. Lassila ◽  
Pekka K. Vallittu
Keyword(s):  
Damage Mechanics ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite

Model and Experimental Analysis of the Fiber-Reinforced Pultrusion Composite Under Tension and Shear

2019 ◽  
Author(s):  
Qian Zhang ◽  
Yanting Zhang ◽  
Wenchun Jiang
Keyword(s):  
Glass Fiber ◽  
Failure Mode ◽  
Strength Increase ◽  
Fiber Reinforced ◽  
Horizontal Shear ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced ◽  
The Matrix ◽  
Homogenization Model

Abstract This paper proposed a homogenization model, and compiled a VUMAT subroutine to simulate the tension and shear of fiber-reinforced pultrusion composite (FRPC). Experiments were also performed to verify the accuracy of the homogenization model. The results show that, the simulation results agree well with the experiment data. The stiffness and strength increase with the increase of the diameter of the carbon composite part. The limit shear load and the horizontal shear strength decrease with the increase of the span. When FRPC is under shear with smaller span, the matrix tensile damage initiates first and it is the dominate failure mode, then the matrix and fiber compression damage occur at where the indenters contact. However, with the increase of the span, the delamination damage between the wound glass-fiber reinforced composite and pultrusion glass-fiber reinforced composite occurs and becomes the dominate failure mode for FRPC shear.

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