Low velocity impact analysis of beams made of short carbon fiber/carbon nanotube-polymer composite: A hierarchical finite element approach

2018 ◽  
Vol 26 (13) ◽  
pp. 1104-1114 ◽  
Author(s):  
M. Ahmadi ◽  
R. Ansari ◽  
M. K. Hassanzadeh-Aghdam
Keyword(s):  
Finite Element ◽  
Carbon Nanotube ◽  
Carbon Fiber ◽  
Impact Analysis ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Finite Element Approach ◽  
Velocity Impact ◽  
Element Approach ◽  
Short Carbon

Influence of low-velocity impact-induced delamination on electrical resistance in carbon fiber-reinforced composite laminates

2018 ◽  
Vol 52 (25) ◽  
pp. 3461-3470 ◽  
Author(s):  
Robert J Hart ◽  
OI Zhupanska
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Electrical Resistance ◽  
Low Velocity Impact ◽  
Finite Element Models ◽  
Fiber Reinforced ◽  
Low Velocity ◽  
Velocity Impact ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

In this paper, experiments have been performed and finite element models have been developed for studying the influence of low-velocity impact damage on the four-probe electrical resistance of carbon fiber-reinforced polymer matrix laminates. Sixteen-ply and 32-ply AS4/3501-6 laminates with quasi-isotropic layup were analyzed. Electrical resistance was evaluated using a four-step procedure. First, finite element models were created in Abaqus Finite Element Analysis (FEA) for simulating low-velocity impact using a quasi-static loading approach. Second, matrix rupture in the inside plies was evaluated, and delamination analysis was performed at the corresponding interfaces to determine delamination patterns. Third, four-probe electrical finite element models were developed in Abaqus FEA for specimens before and after impact using the concept of effective conducting thickness and the delamination patterns obtained from the delamination analysis. Effects of the low-velocity impact delamination on four-probe top and oblique electrical resistance were studied. Electrical resistance predictions were compared to the experimental data. Both top and oblique resistance planes were sensitive to presence of delamination with the oblique resistance measurement being more sensitive as compared to the top resistance measurement. In addition, the resistance of the 16-ply specimens was more greatly affected by the delamination compared to the 32-ply specimens. The proposed analysis can be utilized for design of carbon fiber-reinforced polymer matrix composites with optimized damage sensing capabilities.

Multiple Low Velocity Impact on Twisted Composite Stiffened Blade: A Finite Element Approach

2017 ◽  
Author(s):  
Mrutyunjay Rout ◽  
Sasank Shekhar Hota ◽  
Amit Karmakar
Keyword(s):  
Finite Element ◽  
Degrees Of Freedom ◽  
Shell Element ◽  
Low Velocity Impact ◽  
Stiffened Panel ◽  
Low Velocity ◽  
Finite Element Approach ◽  
Element Approach ◽  
Loading And Unloading ◽  
The Impact

This paper presents the numerical modeling of a twisted stiffened cylindrical shell employing finite element approach to investigate the transient response due to impact of multiple masses, wherein the shell and the stiffener are modeled as 8 noded isoparametric shell element with five degrees of freedom per node and 3 noded isoparametric curved beam element having four degrees of freedom per node, respectively. The stiffener element is considered as a discrete beam element and its nodal degrees of freedom are transferred to the corresponding degrees of freedom of the shell element considering curvature and eccentricity. The impact force is predicted by employing modified Hertzian contact law relating the contact force to local indentation. As indentation takes place the impactor induces damage and permanent deformation in the contact zone of stiffened panel, as a result the loading and unloading curves are different. Different mathematical equations are considered for both loading and unloading cases in the stiffened panel during low-velocity impact. The accuracy and effectiveness of the finite element approach is verified by comparing the results with the corresponding solutions of analytical as well as standard computational methods available in the open literature. The optimum design of a structure can only be obtained by understanding the impact behavior and the roles of various parameters affecting the response. Hence, parametric study has been carried out to predict the time histories of contact force, displacement of the impact point and in-plane stresses during low-velocity concurrent/delayed impact at multiple locations of the stationary and rotating stiffened shell.

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