A Study of Deformation and Failure of Unidirectional Fiber-Reinforced Polymers Under Transverse Loading by Means of Computational Micromechanics

2016 ◽  
pp. 383-396
Author(s):  
Marek Romanowicz
Keyword(s):  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Transverse Loading ◽  
Reinforced Polymers ◽  
Deformation And Failure ◽  
Unidirectional Fiber ◽  
Computational Micromechanics

An Eulerian Orthogonal Cutting Model for Unidirectional Fiber-Reinforced Polymers

2018 ◽  
Vol 140 (2) ◽  
Author(s):  
Shengqi Zhang ◽  
John S. Strenkowski
Keyword(s):  
Cutting Forces ◽  
Orthogonal Cutting ◽  
Damage Model ◽  
Subsurface Damage ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Reinforced Polymers ◽  
Unidirectional Fiber ◽  
Frp Composites ◽  
Cutting Model

An Eulerian model is described that simulates orthogonal cutting of unidirectional fiber-reinforced polymer (FRP) composites. The continuous finite element method (FEM) and the discontinuous Galerkin (DG) method are combined to solve the governing equations. A progressive damage model is implemented to predict subsurface damage in the composite. A correction factor that accounts for fiber curvature is included in the model that incorporates the influence of fiber bending. It was found that fiber orientation has a dominant influence on both the cutting forces and subsurface damage. Good agreement was found between predicted cutting forces and subsurface damage and published experimental observations.

scholarly journals Phase-Field Modeling of Damage and Fracture in Laminated Unidirectional Fiber Reinforced Polymers

2021 ◽  
Vol 9 (2) ◽  
pp. 110-116
Author(s):  
Aamir Dean ◽  
Pavan Kumar ◽  
Ammar Babiker ◽  
Martin Brod ◽  
Salih Elhadi Mohamed Ahmed ◽  
...  
Keyword(s):  
Phase Field ◽  
Composite Structures ◽  
Failure Mechanisms ◽  
Matrix Cracking ◽  
Fiber Reinforced Polymers ◽  
Failure Behavior ◽  
Fiber Reinforced ◽  
Reinforced Polymers ◽  
Unidirectional Fiber ◽  
Damage And Fracture

The damage and fracture behavior of Fiber Reinforced Polymers (FRPs) is quite complex and is different than the failure behavior of the traditionally employed metals. There are various types of failure mechanisms that can develop during the service life of composite structures. Each of these mechanisms can initiate and propagate independently. However, in practice, they act synergistically and appear simultaneously. The difficulties that engineers face to understand and predict how these different failure mechanisms result in a structural failure enforce them to use high design safety factors and also increases the number of certification tests needed. Considering that the experimental investigations of composites can be limited, very expensive, and time-consuming, in this contribution the newly developed multi Phase-Field (PF) fracture model [1] is employed to numerically study the failure in different Unidirectional Fiber Reinforced Polymers (UFRPs) laminates, namely, fracture in single-edge notched laminated specimens, matrix cracking in cross-ply laminates, and delamination migration in multi-layered UFRPs. The formulation of the PF model incorporates two independent PF variables and length scales to differentiate between fiber and inter-fiber (matrix-dominated) failure mechanisms. The physically motivated failure criterion of Puck is integrated into the model to control the activation and evolution of the PF parameters. The corresponding governing equations in terms of variational formulation is implemented into the Finite Element (FE) code ABAQUS utilizing the user-defined subroutines UMAT and UEL.  

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