Dynamic Response of Curved Laminated Plates Subjected to Low Velocity Impact

1987 ◽  
Vol 109 (1) ◽  
pp. 67-71 ◽  
Author(s):  
R. L. Ramkumar ◽  
Y. R. Thakar
Keyword(s):  
Impact Test ◽  
Laminated Plates ◽  
Low Velocity Impact ◽  
Test Results ◽  
Governing Equations ◽  
Transverse Impact ◽  
Flat Plates ◽  
Low Velocity ◽  
Rigid Object ◽  
The Impact

An analysis to predict the transient response of a thin, curved laminated plate subjected to low velocity transverse impact by a rigid object is presented. The contact force history due to the impact phenomenon is assumed to be a known imput to the analysis. The coupled governing equations, in terms of the Airy stress function and shell deformation, are solved using Fourier series expansions for the variables. Closed-form analytical solutions for plate deflections and strains are compared with available impact test results for flat plates. Outer ply strains are used to predict fiber failures and matrix splitting between fibers in the impacted laminate.

Experimental Investigation of Impacted and Non-Impacted Composite Laminates under Compressive Loading

2011 ◽  
Vol 284-286 ◽  
pp. 607-610
Author(s):  
Jiang Tao Ruan ◽  
Min Shen ◽  
Jing Wei Tong ◽  
Shi Bin Wang ◽  
Francesco Aymerich ◽  
...  
Keyword(s):  
Composite Laminates ◽  
Optical Measurement ◽  
Speckle Pattern ◽  
Compressive Loading ◽  
Laminated Plates ◽  
Low Velocity Impact ◽  
Compressive Deformation ◽  
Electronic Speckle Pattern Interferometry ◽  
Low Velocity ◽  
The Impact

In this paper, the deformation measurements of impacted and non-impacted composite laminates under compressive loading are taken. [03/903]S orientated cross-ply laminated plates with impact delamination and without delamination are tested using an anti-buckling testing device in compression experiment. The delamination is induced by low-velocity impact test at the impact energy level of 3.105J. For both impacted and non-impacted specimens, the compressive deformation is measured by a carrier electronic speckle pattern interferometry (CESPI) optical measurement technique. It is found that the deformation behavior of the two specimens presents a mixed deformation mode. However, the delamination has significant effect on the compressive deformation of composite laminates.

scholarly journals Ultrasonic Analysis of Damage in CFRP Resulting from Static Indentation and Low Velocity Impact

1993 ◽  
Vol 2 (3) ◽  
pp. 096369359300200
Author(s):  
H. Kaczmarek
Keyword(s):  
Impact Testing ◽  
Low Velocity Impact ◽  
Ultrasonic Tomography ◽  
Transverse Impact ◽  
Low Velocity ◽  
Velocity Impact ◽  
Testing Procedures ◽  
Damage Initiation ◽  
Static Indentation ◽  
The Impact

In order to reduce hidden damage caused in CFRP by low velocity transverse impact, testing procedures must be established by understanding the impact phenomena and the roles of various parameters on damage initiation and growth. Hence, composite plates were stressed and an original method, “ultrasonic tomography,” was applied to detect delaminations on the interfaces. The results show the similarity of the damage growth resulting from static indentation and low velocity impact.

scholarly journals Improvement of Impact Damage Resistance of Epoxy-Matrix Composites Using Ductile Hollow Fibers

2013 ◽  
Vol 8 (1) ◽  
pp. 155892501300800
Author(s):  
Mohammad Nasr-Isfahani ◽  
Masoud Latifi ◽  
Mohammad Amani-Tehran
Keyword(s):  
Impact Damage ◽  
Fiber Composites ◽  
Filament Winding ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Experimental Investigations ◽  
Matrix Composites ◽  
Transverse Impact ◽  
Low Velocity ◽  
The Impact

Fiber reinforced polymer structures typically respond very poorly to transverse impact events. In this study, some experimental investigations are performed on the low velocity impact behavior of unidirectional hollow, solid and hybrid (hollow/solid) polyester fiber composites. The materials are fabricated in a curved shape using filament winding method. The impact tests are applied on the simply supported specimens by a drop weight impact test apparatus at five levels of energy. To present a proper comparison on the results, the various densities of the materials are considered as normalizing coefficients. It is observed that in the hollow fiber composites cracks appear at an appreciably higher amount (93%) of impact energy than the solid ones.

Low Velocity Impact of a Viscoelastic Beam

1982 ◽  
Vol 104 (2) ◽  
pp. 210-215
Author(s):  
R. E. Llorens ◽  
E. J. McQuillen
Keyword(s):  
Composite Laminates ◽  
Low Velocity Impact ◽  
Viscoelastic Beam ◽  
Test Results ◽  
Transverse Impact ◽  
Low Velocity ◽  
Euler Beam ◽  
Numerical Predictions ◽  
Linear Viscoelastic ◽  
Good Agreement

A theoretical solution for the response of a viscoelastic beam to off-center low speed transverse impact is presented. The flexural model adopted for investigation consists of a uniform Bernoulli-Euler beam whose behavior has been generalized to include a linear viscoelastic constitutive relation for each element of the beam. Further, the beam and rigid impactor are assumed to remain in contact during the resulting motion and a consistent set of initial displacement and velocity distributions is adopted for the beam. The solution method utilizes two Laplace transforms, i.e., one with respect to space and the other with respect to time. Comparison of the numerical predictions of the theoretical model with central impact test results on graphite-epoxy composite laminates indicates a good agreement between theory and experiment.

scholarly journals Analysis on the impact response of fiber-reinforced composite laminates: an emphasis on the FEM simulation

2019 ◽  
Vol 26 (1) ◽  
pp. 1-11
Author(s):  
Jian He ◽  
Liang He ◽  
Bin Yang
Keyword(s):  
Energy Absorption ◽  
Impact Energy ◽  
Composite Laminates ◽  
Mechanical Response ◽  
Adhesive Layer ◽  
Laminated Plates ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Damage Area ◽  
The Impact

AbstractThe effects of units, material parameters, and constitutive relationships on the dynamic mechanical response of composite laminates subjected to high- and low-velocity impacts were investigated. Additionally, the role of impact or shape, including hemispherical, flat, and conical, on the damage area of the adhesive layer and displacement of the center of the laminated plates was investigated. The results show that the energy absorption of composite laminates increases with impact velocity, and specific energy absorption changes with the density of the contact surface, which is affected by ply thickness. Moreover, the target energy absorption decreases with increasing layer angle. Under a low-velocity impact, the maximum contact force, damage area of the adhesive layer, and displacement of the center of the laminated plate increase as the impact energy increases, thus showing that impact energy is not directly related to contact duration and energy absorption of composite laminates. The results of different geometric shapes show that the damage area of the adhesive layer and the displacement of the center of the laminated plates are largest for a conical impactor and smallest for a flat impactor.

Improvement of Biocomposite Performance under Low-Velocity Impact Test - A Review

2021 ◽  
Vol 893 ◽  
pp. 67-74
Author(s):  
Usha Kiran Sanivada ◽  
Gonzalo Mármol ◽  
Francisco P. Brito ◽  
Raul Fangueiro
Keyword(s):  
Composite Structures ◽  
Impact Test ◽  
Impact Resistance ◽  
Vital Role ◽  
Low Velocity Impact ◽  
Efficient Design ◽  
Low Velocity ◽  
Velocity Impact ◽  
Impact Tests ◽  
The Impact

The study of the impact energy and the composite behaviour plays a vital role in the efficient design of composite structures. Among the various categories of impact tests, it is essential to study low-velocity impact tests as the damage generated due to these loads is often not visible to the naked eye. The internal damages can reduce the strength of the composites and hence the impact behaviour must be addressed specifically for improving their applications in the transport industry. The main aim of this paper is to provide a comprehensive review of the work focusing on the assessment of biocomposites performance under low impact velocity, the different deformations, and damage mechanisms, as well the methods to improve the impact resistance.

scholarly journals Energy absorption capability of laminated plates made of fully thermoplastic composite

2018 ◽  
Vol 232 (8) ◽  
pp. 1389-1401 ◽  
Author(s):  
Simonetta Boria ◽  
Alessandro Scattina
Keyword(s):  
Energy Absorption ◽  
Laminated Plates ◽  
Thermoplastic Composite ◽  
Low Velocity Impact ◽  
Thermoplastic Composites ◽  
Fibre Reinforcement ◽  
Low Velocity ◽  
Wide Range ◽  
The Matrix ◽  
The Impact

The behaviour of composites materials, made of synthetic fibres embedded in a thermoplastic resin, subjected to low velocity impacts, was largely studied in the past. However, in the last years, the use of thermoplastic composites has been increased due to the considerable advantages in terms of recyclability of this family of materials. Thermoplastic composites are composed of polymers with different material’s structure if compared to the more traditional thermoset composite. Consequently, the behaviour of these materials can be different in some loading conditions. Moreover, considering the wide range of thermoplastic composites that have been developed in the last years, the study of the behaviour of these materials, in case of impact, has not been yet widely analysed, in particular considering materials where both the matrix and the reinforcement are made of thermoplastic. In this perspective, the goal of this work is to study the behaviour of a new thermoplastic composite (PURE thermoplastic) in conditions of low velocity impact. In this material, the matrix and the fibre reinforcement are made of polypropylene both. The paper presents the results of an experimental investigation. In particular, a series of impact tests with a drop dart equipment have been carried out on laminates made of PURE thermoplastic. Laminates with different thicknesses have been taken into consideration. The influence of the impact conditions on the material’s behaviour has been investigated and the capability of energy absorption has been studied. The PURE thermoplastic showed a different behaviour in terms of energy absorption and damage mechanisms if compared to the composites presented in the literature. The thickness of the laminate has had influence on the deformation and the damage mechanism of the specimens: with low thickness, the perforation of the specimen has been obtained, whereas, with the higher thickness, the specimens have shown a ductile behaviour and extended plasticity without crack tip. The contact force between the dart and the specimen has been influenced by the energy level of the impact, but with an opposite trend if compared to that of the composites studied in the literature.

Developing a Mini-Impact System for Measuring Silicon Wafer's Elastodynamic Response

2005 ◽  
Vol 21 (1) ◽  
pp. 33-39 ◽  
Author(s):  
S. T. Jenq ◽  
T. S. Leu ◽  
Y. G. Su ◽  
J. S. Lee ◽  
G. C. Hwang
Keyword(s):  
Silicon Wafer ◽  
Wave Speed ◽  
Mechanical Response ◽  
Low Velocity Impact ◽  
Dynamic Strain ◽  
Stress Wave Propagation ◽  
Test Results ◽  
Low Velocity ◽  
Velocity Impact ◽  
The Impact

AbstractThe purpose of this work is to study the dynamic mechanical response of silicon wafer subjected to low-velocity impact loading. Transient finite element analysis was utilized to obtain the numerical simulated result and was used to check against the experimental findings. Good relationship between each other was observed. A pair of polysilicon microsensors manufactured by the micro-fabrication technique was directly fabricated on the surface of silicon wafer so as to detect the impact induced dynamic strain. A series of low-velocity impact tests utilizing the home-made drop-weight mini-tower tester was conducted. These test results were used to examine the accuracy and adequacy of the current micro strain sensors for stress wave propagation measurements. It is concluded that the difference between the present measured wave speed and the one-dimensional longitudinal wave speed under conditions of plane strain were determined to be within 5.6% for the present low-speed impact problem. A maximum of 10.9% deviation between the test determined elastic modulus and a reference value (16) of 130 GPa was found based on a series of impact test results. In addition, a difference of 2% error was reported when we compared the test detected peak stress value after impact initiated (before wave is reflected from the boundary) and the corresponding numerical simulated response.

scholarly journals Simulation of Quasi-Isotropic E-Glass Composite Laminate at Low Velocity Impact with Cohesive Interface Elements

2020 ◽  
pp. 128-140
Keyword(s):  
Composite Laminate ◽  
Impact Test ◽  
Impact Damage ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Interface Elements ◽  
Cohesive Interface ◽  
Isotropic Composite ◽  
Structural Impact ◽  
The Impact

This paper examines the expediency of interface elements in modeling of impact damage analysis for Eglass composite laminate under low velocity impact test. Numerical modelsare built adopting cohesive interface behavior to authenticate the cross-ply damage response; and successively used the strategy to model the impact response of quasi-isotropic composite laminate. Impact test are performed to characterize the induced-damage behavior in quasi-isotropic composite laminate at different impact energy test in terms of impact force, displacement and damage size as well as the stress failure trajectory. Numerical result shows reliability of the model for structural impact analysisin damage initiation and progression in laminated composite plates. The simulation result though reveals large deformation, yet, did not yield in total fracture. This development shows the importance of adopting interface elements in structural impact damage criterion to trigger constraints effect on initiation phase.The study also reveals that the bottom most surface suffers huge deformation compare to the impact surface. It divulges that the extent of damage area in each ply of the composite laminate orients in the fiber direction in ‘star-shaped contour. The main novelty is the capability of using this model for structural impact analysis on both cross-ply and quasi-isotropic composite laminate.

Low-Velocity Impact Response and Dynamic Characteristics of Glass-Resin Composites

2000 ◽  
Author(s):  
P. Raju Mantena ◽  
Richa Mann ◽  
Chandrasekhar Nori
Keyword(s):  
Dynamic Modulus ◽  
Impact Test ◽  
Resin Composite ◽  
Impact Response ◽  
Low Velocity Impact ◽  
Test Machine ◽  
Ambient Conditions ◽  
Low Velocity ◽  
Velocity Impact ◽  
The Impact

Abstract This paper describes a test methodology used for characterizing different glass-resin composite systems with respect to their low-velocity impact response, dynamic modulus and inherent damping properties. Impact tests were conducted on SMC plaque samples in an instrumented impact test machine. A Dynamic Mechanical Analyzer was used for testing small rectangular samples in the fixed frequency mode of operation. An impulse-frequency response vibration technique was used for obtaining the dynamic modulus and loss factor of cantilever beam specimens at ambient conditions. The dynamic modulus, glass transition and damping peak intensities obtained from the DMA and the vibration techniques are correlated with the impact test data. The potential application for screening glass-resin formulations with respect to their impact performance is discussed.

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