On the Use of Quasi-Static Testing to Assess Impact Damage Resistance of Composite Shell Structures

Weirdie, Brian L.; Lagacé, Paul A.

doi:10.1080/10759419808945895

Cited by 29 publications

(5 citation statements)

References 4 publications

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“…11 Many research findings suggest that the contact force-indentation relations for a quasi-static test and a low-velocity impact event are almost analogous. 12,13 The C-scan damage area and load-displacement curves are consistent. 14-18 Since the strain rate and wave propagation effects are typically insignificant for low-velocity impacts, quasi-static indentation have been frequently utilized to depict and explain the impact response in a more effective way.…”

Section: Introductionmentioning

confidence: 65%

Quasi-static indentation damage mechanics of PU foam core reinforced with fly ash particulate

Pareta

Singh

Ram

et al. 2023

Journal of Cellular Plastics

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The fly ash (FA) particulates are used in this study to reinforce the polyurethane foam (PUF) core. The FA particles inclusion improves the mechanical performance of the PUF core under compression by increasing its modulus of elasticity. Low-velocity impacts have damage dynamics that are pretty similar to quasi-static indentation. Consequently, the indentation resistance capability of the PUF core is investigated for three types of indenter nose tips with varied FA wt. Percentages (flat-circular, hemispherical, and conical). The results reveal that the reinforced foam core’s resistance varies with reinforcement percentage under indentation. However, FA reinforcement to PUF does not necessarily improve indentation resistance. The damage mechanism of the PUF core under indentation has been evaluated for each type of indenter. The interaction of crushing, shear, and tear of the damaged surface with the change in indenter nose tip has been explained with 0–20% variation of FA particles. Scanning electron microscope (SEM) images are taken for the analysis of the damaged PUF core cross-section at the indented location. Earlier mechanical findings of the scatter in deformation behavior with the indenter nose tip geometry are substantiated by the SEM studies.

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Section: Introductionmentioning

confidence: 65%

Quasi-static indentation damage mechanics of PU foam core reinforced with fly ash particulate

Pareta

Singh

Ram

et al. 2023

Journal of Cellular Plastics

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“…It is concluded that the impact behavior of composites depends on the structural parameters of weft-knitted spacer fabrics and the geometrical parameters of fabric also affect on influence the impact behavior of textile composites. Weirdie and Lagace 21 reported that the impact tests fall within the so-called large-mass, low-velocity regime, where previous findings for composite plates indicate that quasi-static tests represent the impact response accurately; i.e. impact and quasi-static tests can be considered equivalent.…”

Section: Introductionmentioning

confidence: 96%

An experimental study on quasi-static indentation, low-velocity impact and damage behaviors of laminated composites at high temperatures

Djele

Karakuzu

2021

Polymers and Polymer Composites

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Nowadays, fiber reinforced laminated composites are widely used in many applications due to their high strength/weight ratio. However, these materials are very sensitive to transverse loading. The low-velocity impact test has been widely used by researchers to simulate the transverse loading. However, the low-velocity impact tests are highly toilsome, and this test requires expensive hardware and software systems. To reduce the experimental costs of the low-velocity impact test, it will be more attractive, much simpler, cheaper and more widely available to achieve impact behavior using quasi-static tests. Thus, to compare both tests, in this work the absorbed energy and force-deflection curves obtained by low-velocity impact and quasi-static indentation loading in two different fiber reinforced epoxy composites have been investigated. The Carbon-Kevlar hybrid fabrics and S2 glass fabrics were used as reinforcements. For low-velocity impact tests, a range of energies was used between 20 and 80 J. For quasi-static indentation test, the crosshead speeds were increased gradually from 1 mm/min to 60 mm/min. In addition, tests at 23°C, 40°C, 60°C and 80°C were made to examine the effect of temperature on these tests. As a result of the quasi-static tests performed, the amount of energy required to perforate the samples at a certain test speed is at the same level as the low-velocity impact test. Thus, the required energy amount for the perforation of the materials can be found by performing a quasi-static test at an appropriate speed, rather than the low-velocity impact test.

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“…While utilizing beam specimens allows for macroscopic in-situ observations, the rapid nature of impact events complicates the process of investigating damage mechanisms. To tackle this challenge, numerous researchers have focused on quasi-static indentation (QSI) experiments to qualitatively identify the damage mechanisms that take place during LVI events [9][10][11][12][13] because the overall impact response and failure modes has been demonstrated to show strong correlation with the quasi-static test setup. Moreover, Bozkurt and Coker [14] has revealed that the similarities between LVI and QSI experiments extend beyond just the global response to encompass dynamic aspects like delamination propagation speeds.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ply Thickness on Dynamic Damage Progression in Cross-ply Laminates Under Low-velocity Impact

Batmaz,

Coker

2023

9th ECCOMAS Thematic Conference on the Mechanical Response of Composites

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In this study, we have conducted in-situ LVI experiments on cross-ply CFRP beams having stacking layups [04/904/02]s and [02/902/02/902/02]s. The progression of damage is observed through high-speed photography. In addition to LVI, quasi-static indentation (QSI) experiments are performed to reduce challenges in monitoring damage progression during the short impact loading interval. QSI experiments provide magnified in-situ observations on the free edge of the beam using a traveling digital microscope. Numerical simulations of these experiments are carried out using the finite element method in ABAQUS/Explicit. The orthotropic constitutive material model, predicting fiber and matrix damage initiation and evolution, is implemented through a VUMAT subroutine. The comparison between numerical simulations and experimental observations allowed us to investigate the influence of ply clustering on the LVI-induced damage mechanisms.

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On the Use of Quasi-Static Testing to Assess Impact Damage Resistance of Composite Shell Structures

Cited by 29 publications

References 4 publications

Quasi-static indentation damage mechanics of PU foam core reinforced with fly ash particulate

Quasi-static indentation damage mechanics of PU foam core reinforced with fly ash particulate

An experimental study on quasi-static indentation, low-velocity impact and damage behaviors of laminated composites at high temperatures

Effect of Ply Thickness on Dynamic Damage Progression in Cross-ply Laminates Under Low-velocity Impact

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