scholarly journals Effect of Weaving Type on Damage Behaviour of Carbon/Epoxy Laminate under Low Velocity Impact Loading

2017 ◽  
Vol 61 (2) ◽  
pp. 140 ◽  
Author(s):  
Djilali Beida Maamar ◽  
Ramdane Zenasni
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Impact Load ◽  
Low Velocity Impact ◽  
The Finite Element Method ◽  
Low Velocity ◽  
Velocity Impact ◽  
Rigid Body Model ◽  
The Matrix ◽  
Finite Element Package

The main purpose of the present investigation was to determine the damages generated by the low velocity impact by mean of the finite element method. The commercial transient finite element package LS-dyna used to model the effect of slug impactor induced damage in composite material subjected to low velocity impact. Four types of weaving were considered; serge (2/2), serge (0/30/-30/0), serge (0/45-45/0) and taffeta. The Texgen package was used to build the laminate pattern weaves. The composite material was subjected to stainless steel slug impactor in the transverse direction dropping the composite laminate at the center with a velocity about of 15m/s. The analysis was carried out using the model 001-ELASTIC for matrix, 002-ORTHOTROPIC_ELASTIC for fibersand a rigid body model MAT20 for the slug impactor. The contact automatic single surface has been used between the yarns and the automatic_surface_to_surface between the matrix and the impactor and the contact automatic_surface_to_surface_tiebreak between the matrix and yarns and the contact automatic_surface_to_surface_tiebreak between layers.The impact load, energy, displacements were reported as function of impact time. The delamination area was represented at the layer interfaces for each material.

scholarly journals Relationship Between Matrix Cracking and Delamination in CFRP Cross-Ply Laminates Subjected to Low Velocity Impact

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3990 ◽  
Author(s):  
Riming Tan ◽  
Jifeng Xu ◽  
Wei Sun ◽  
Zhun Liu ◽  
Zhidong Guan ◽  
...  
Keyword(s):  
Finite Element ◽  
Large Scale ◽  
Matrix Cracking ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Velocity Impact ◽  
Matrix Cracks ◽  
Impact Location ◽  
The Matrix ◽  
The Impact

The effect of matrix cracking on the delamination morphology inside carbon fiber reinforced plastics (CFRP) laminates during low-velocity impact (LVI) is an open question. In this paper, the relationship between matrix cracking and delamination is studied by using cross-ply laminates. Several methods, including micrograph, C-scan, and visual inspection, were adopted to characterize the damage after LVI experiments. Based on the experimental results, finite element (FE) models were established to analyze the damage mechanisms. The matrix cracking was predicted by the extended finite element method (XFEM) and the Puck criteria, while the delamination was modeled by cohesive elements. It was revealed that the matrix crack in the bottom ply not only promoted the outward propagation of delamination but also contributed to the narrow delamination beneath the impact location. Multiple matrix cracks occurred in the middle ply. The ones close to the plate center initiated the delamination and prevented large-scale delamination beneath the impact location. For the cracks that were far away, no significant effect on delamination was found. In conclusion, the stress redistribution caused by the crack opening determines the delamination.

scholarly journals Damage sensing and mechanical properties of a laminate composite material containing MWCNTs during low-velocity impact

2020 ◽  
Vol 10 (4) ◽  
pp. 147-164
Author(s):  
Mohammed Al-Bahrani ◽  
Mohammed Ridh H. Alhakeem ◽  
Alistair Cree
Keyword(s):  
Composite Material ◽  
Impact Energy ◽  
Electrical Resistance ◽  
Impact Load ◽  
Fibre Composite ◽  
Low Velocity Impact ◽  
High Concentration ◽  
Low Velocity ◽  
Velocity Impact ◽  
Conductivity Property

In this work, we present a new criterion, unlike other attempts, to evaluate and quantify the degree of damage of composite material when it subjected to a sudden impact load. Our criterion exploits the high intrinsic electrical conductivity property of the Multi-walled carbon nanotubes (MWCNTs) after dispersing different concentrations of them (0, 0.5, 1.0, 1.5 and 2.0 %) in the epoxy matrix of a glass fibre composite. Following this goal, the low-velocity impact and flexural after impact (FAI) tests on the MWCNTs-glass epoxy (i.e. MWCNTs-GF) nanocomposite were evaluated. At the same time, the changes in its electrical resistance were measured. The results showed that the properties of the self-sensing composites were significantly affected by impact energy. The damage after impact causes an increase in the electrical resistance of the MWCNTs-GF nanocomposite and increases with increased impact energy. In addition, the samples containing a high concentration of MWCNTs showed lower damage sensitivity under all impact energies levels as compared with the samples contain a lower MWCNTs concentration. Therefore, the results presented in this work have shown that it is possible to associate the change in electrical resistance of the MWCNTs-GF nanocomposite with the degree of damages caused by impact load.

scholarly journals Finite Element Analysis of the Multilayered Honeycomb Composite Material Subjected to Impact Loading

2017 ◽  
Vol 54 (1) ◽  
pp. 180-179 ◽  
Author(s):  
Raul Cormos ◽  
Horia Petrescu ◽  
Anton Hadar ◽  
Gorge Mihail Adir ◽  
Horia Gheorghiu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Composite Material ◽  
Experimental Testing ◽  
Finite Element Models ◽  
The Finite Element Method ◽  
Low Velocity ◽  
Element Analysis ◽  
Element Simulation ◽  
Different Levels

The main purpose of this paper is the study the behavior of four multilayered composite material configurations subjected to different levels of low velocity impacts, in the linear elastc domain of the materials, using experimental testing and finite element simulation. The experimental results obtained after testing, are used to validate the finite element models of the four composite multilayered honeycomb structures, which makes possible the study, using only the finite element method, of these composite materials for a give application.

Self-Repairing Approaches for Resin Infused Composites Subjected to Low Velocity Impact

1999 ◽  
Author(s):  
Molefi Motuku ◽  
Gregg M. Janowski ◽  
Uday K. Vaidya
Keyword(s):  
Polymer Composites ◽  
Hollow Fibers ◽  
Low Velocity Impact ◽  
Composite Panels ◽  
Low Velocity ◽  
Fiber Failure ◽  
Velocity Impact ◽  
Damaged Zone ◽  
The Matrix ◽  
Copper Tubing

Abstract Low velocity impact response (LVIR) of glass reinforced polymer composites (GRPCs), which have the potential to self repair both micro- and macro-damage, has been investigated. This class of materials falls under the category of passive smart polymer composites. The self-repairing mechanism is achieved through the incorporation of hollow fibers in addition to the normal solid reinforcing fibers. The hollow fibers store the damage-repairing solution or chemicals that are released into the matrix or damaged zone upon fiber failure. Plain-weave S-2 glass fabric reinforcement, DERAKANE vinyl ester 411-C50 and EPON-862 epoxy resin systems were considered for this study. Different tubing materials were investigated for potential use for storing the repairing chemicals instead of the actual hollow repair-fibers and included borosilicate glass micro-capillary pipets, flint glass Pasteur pipets, copper tubing and aluminum tubing. Composite panels were fabricated by using vacuum assisted resin transfer molding (VARTM) process. The present investigation addressed fabrication of self-repairing composite panels, the processing quality, selection of storage material for the repairing solution and, release and transportation of repairing solution.

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