Ply-Orientation Dependence of Notched Strength of Multidirectional CFRP Laminates and Prediction Using a Finite Fracture Mechanics Model

2018 ◽  
Author(s):  
MASAMICHI KAWAI ◽  
MASATO SUZUKI
Keyword(s):  
Fracture Mechanics ◽  
Orientation Dependence ◽  
Cfrp Laminates ◽  
Mechanics Model ◽  
Finite Fracture Mechanics ◽  
Notched Strength ◽  
Ply Orientation

A Finite Fracture Mechanics Model for the Prediction of the Notched Response and Large Damage Capability of Composite Laminates

2014 ◽  
Vol 627 ◽  
pp. 13-16 ◽  
Author(s):  
A. Arteiro ◽  
Giuseppe Catalanotti ◽  
J. Xavier ◽  
P.P. Camanho
Keyword(s):  
Fracture Mechanics ◽  
Composite Laminates ◽  
Present Model ◽  
Dimensionless Parameter ◽  
Notch Sensitivity ◽  
Sensitivity Factor ◽  
Mechanics Model ◽  
Finite Fracture Mechanics ◽  
Open Hole ◽  
Notched Strength

A new model based on Finite Fracture Mechanics (FFMs) has been proposed to predict the open-hole tensile strength of composite laminates [1]. Failure is predicted when bothstress-based and energy-based criteria are satisfied. This model is based on an analytical solution, and no empirical adjusting parameters are required, but only two material properties: the unnotched strength and the fracture toughness. In the present work, an extension of the proposed FFMs model to predict the notched response of composite laminates with notch geometries other than a circular opening [2] is presented and applied to the prediction of size effects on the tensile and compressive notched strength of composite laminates. The present model is also used to assess the notch sensitivity and brittleness of composite laminates by means of versatile design charts and by the identification of a dimensionless parameter designated as notch sensitivity factor. A further extension of the FFMs model is proposed, which takes into account the crack resistance curve of the laminate in the model's formulation, and it is used to predict the large damage capability of a non-crimp fabric thin-ply laminate [3].

Failure prediction of irregular arranged multi-bolt composite repair based on finite fracture mechanics model

2021 ◽  
Vol 242 ◽  
pp. 107456
Author(s):  
Xiang Li ◽  
Zonghong Xie ◽  
Wei Zhao ◽  
Yongxiang Zhang ◽  
Yu Gong ◽  
...  
Keyword(s):  
Fracture Mechanics ◽  
Failure Prediction ◽  
Composite Repair ◽  
Mechanics Model ◽  
Finite Fracture Mechanics

A novel model of Z-pin insertion in prepreg based on fracture mechanics

2021 ◽  
pp. 095440542110144
Author(s):  
Guobiao Ji ◽  
Liang Cheng ◽  
Shaohua Fei ◽  
Jiangxiong Li ◽  
Yinglin Ke
Keyword(s):  
Fracture Toughness ◽  
Fracture Mechanics ◽  
Analytical Model ◽  
Model Parameters ◽  
Force Model ◽  
Fe Model ◽  
Cohesive Elements ◽  
Fe Method ◽  
Insertion Force ◽  
Mechanics Model

Through-thickness reinforcement is a promising solution to the problem of delamination susceptibility in laminated composites. Modeling Z-pin–prepreg interaction is essential for accurate robotics-assisted Z-pin insertion. In this paper, a novel Z-pin insertion force model combining the classical cohesive finite element (FE) method with a dynamic analytical fracture mechanics model is proposed. The velocity-dependent cohesive elements, in which the fracture toughness is provided by the analytical model, are implemented in Z-pin insertion FE model to predict the crack initiation and propagation. Then Z-pin insertion experiments are performed on prepreg sample with metallic Z-pins at different velocities to identify the analytical model parameters and validate the simulation predictions offered by the model. Dynamics of Z-pin interaction with inhomogeneous prepreg is described and the effects of insertion velocity on prepreg contact force are studied. Results show that the force model agrees well with experiments and the fracture toughness rises with the increasing Z-pin insertion velocity.

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