Composite damage model based on continuum damage mechanics and low velocity impact analysis of composite plates

2013 ◽  
Vol 95 ◽  
pp. 123-134 ◽  
Author(s):  
Eun-Ho Kim ◽  
Mi-Sun Rim ◽  
In Lee ◽  
Tae-Kyung Hwang
Keyword(s):  
Damage Mechanics ◽  
Impact Analysis ◽  
Damage Model ◽  
Composite Plates ◽  
Continuum Damage Mechanics ◽  
Low Velocity Impact ◽  
Continuum Damage ◽  
Low Velocity ◽  
Velocity Impact ◽  
Composite Damage

Probabilistic Failure of Graphite Epoxy Composite Plates Due to Low Velocity Impact

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Shivdayal Patel ◽  
Suhail Ahmad
Keyword(s):  
Damage Mechanics ◽  
Optimization Procedure ◽  
Composite Plates ◽  
Matrix Cracking ◽  
Low Velocity Impact ◽  
Stochastic Dynamic ◽  
Low Velocity ◽  
Element Analysis ◽  
Velocity Impact ◽  
Damage Initiation

Stochastic finite-element analysis of composite plates due to low velocity impact (LVI) is studied, considering the material properties (Young's modulii, Poisson's ratio, strengths, and fracture energy) and initial velocity as random parameters. Damage initiation and propagation failure due to matrix cracking are investigated for safety criteria for the LVI. Progressive damage mechanics is employed to predict the stochastic dynamic response of the plates. The Gaussian process response surface method (GPRSM) is presently adopted to determine the probability of failure (Pf). There is a possibility of underestimation of the peak contact force and displacement by 10.7% and 11.03%, respectively, if the scatter in the properties is not considered. The sensitivity-based probabilistic design optimization procedure is investigated to achieve better strength and lighter weight of composite for body armors.

Failure Prediction of Fiber Reinforced Laminated Composite Plates Under Low Velocity Impact

2016 ◽  
Author(s):  
Shivdayal Patel ◽  
Suhail Ahmad
Keyword(s):  
Damage Mechanics ◽  
Composite Plates ◽  
Low Velocity Impact ◽  
Integration Scheme ◽  
Multiple Cracks ◽  
Progressive Damage ◽  
Low Velocity ◽  
Central Difference ◽  
Velocity Impact ◽  
Impactor Velocity

The low velocity impact on composites has been studied as it leads to serious damage. The damage initiates as an intra ply matrix crack due to shear or bending which propagates further into the interface causing de-lamination between dissimilar plies and fiber breakage. This damage evolves with time and adversely affects the mechanical properties and strength of the composite. Since, multiple cracks in the ply are difficult to track, a progressive damage mechanics approach is used to model this failure. The inter ply failure is modeled using cohesive surfaces between the plies. The low velocity impact on composite plate is studied using finite element method. Impact parameters like velocity of impactor, the mass of the impactor and elastic properties of the material etc. are considered. An explicit central difference integration scheme is used to solve for displacements and impact forces. Progressive damage and failure in composites is modeled; an efficient algorithm has been developed and implemented in the FE code ABAQUS through a user-defined subroutine (VUMAT). Reduced integration yields satisfactory results for the impactor velocity less than or equal to 3 m/s for larger mass impact. However, full integration is recommended to obtain the satisfactory results for the (impactor velocity beyond 3 m/s), high velocity impact involving small masses. For the low velocity impact, the peak contact force and displacement are linear functions of impactor velocity for a constant mass. However, a nonlinear behavior is observed for the variation of mass with a constant striking velocity.

The Simulation of Low-Velocity Impact on Composite Laminates with the Damage Model Based on Strain

2012 ◽  
Vol 525-526 ◽  
pp. 393-396 ◽  
Author(s):  
Chun Hao Ma ◽  
Fei Xu
Keyword(s):  
Composite Laminates ◽  
Cohesive Zone Model ◽  
Damage Model ◽  
Low Velocity Impact ◽  
Zone Model ◽  
Low Velocity ◽  
Velocity Impact ◽  
Damage Initiation ◽  
Composite Damage ◽  
User Material Subroutine

This paper proposed a composite damage model including the damage initiation and evolution based on strain to predict the composite intralaminar damage under impact loading. In the numerical simulation, the user material subroutine VUMAT and the cohesive-zone model are chosen to describe the composite damage model and the delamination of interfaces between different plies. ABAQUS software is used to simulate the low-velocity impact of different thickness composite laminates. It is found that the delamination shape and area, the contact force and the deflection of the impactor obtained by the numerically simulation agree well with the experimental results.

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