Evaluation of the effect of the strain rate on the tensile properties of carbon–epoxy composite laminates

Kwon, Junbeom; Choi, Jae‐Young; Huh, Hoon; Lee, Jungju

doi:10.1177/0021998316683439

Cited by 30 publications

(20 citation statements)

References 22 publications

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“…1b. Inconsistency was also found with the reported dynamic shear modulus from tests on multi-directional (MD) specimens, with one example reporting an increasing shear modulus with increasing strain rate [2] and another reporting practically no strain rate sensitivity [3] from ±45 • configurations. Therefore, when the same testing method is used to test similar materials in similar configurations at similar strain rates, different experimental campaigns yield conflicting results.…”

Section: Introductionsupporting

confidence: 56%

“…Circular markers represent tensile and square markers represent compressive test results, while solid markers are from MD±45 • specimens. Data obtained from composites with thermoset matrices in [2,3,5,6,7,8,9,10,11] of a single UD45 • composite specimen was conducted in [27], characterising transverse and shear moduli under a combined compression/shear state of stress. However, in that work experimental results were processed with smoothing parameters (see Sect.…”

Section: Introductionmentioning

confidence: 99%

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The Off-Axis IBII Test for Composites

Parry

Fletcher

Pierron

2020

J. dynamic behavior mater.

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Composite components regularly experience dynamic loads in service. Despite this, it is still difficult to obtain accurate mechanical properties of composite materials under high strain rate conditions. In this study, a new application of the Image-Based Inertial Impact (IBII) test methodology was developed, to generate an accurate in-plane transverse and shear moduli dataset from unidirectional (UD) off-axis composite specimens. The obtained dataset was consistent across different sample configurations, where results from the UD45$$^{\circ }$$ ∘ off-axis specimens agreed well with the UD90$$^{\circ }$$ ∘ values. Validation of the shear modulus identification was also undertaken by comparing the results from the UD90$$^{\circ }$$ ∘ and UD45$$^{\circ }$$ ∘ specimens with a multi-directional (MD) configuration. Here, it was found that MD±45$$^{\circ }$$ ∘ specimen shear modulus values where marginally lower than that from the UD specimens, in accordance with the lower fibre volume fraction of the MD laminate. Low strain rate sensitivities in the $$0.5-2\times$$ 0.5 - 2 × 10$$^{3}$$ 3 $$\hbox {s}^{-1}$$ s - 1 regime evidenced in this work suggest previously published data (often from split-Hopkinson bar tests) may include both a material and system i.e. testing apparatus response.

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Section: Introductionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

The Off-Axis IBII Test for Composites

Parry

Fletcher

Pierron

2020

J. dynamic behavior mater.

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“…Wang et al [12] studied the dynamic properties of CFRP in the range of 10 −5 to 10 4 s −1 for (45/−45)s and (0/45/90/−45)s configurations, and they found that the (45/−45)s configuration has a stronger strain rate sensitivity. Kwon et al [13] and Taniguchi et al [14] evaluated the effect of stain rate on the tensile properties of CFRP, and they found that the influence of strain rate is barely observed in the (0) direction, whereas that in the (90) direction is remarkable. Therefore, the effect of stain rate on tensile properties, including strength, modulus, and failure strain, has not been completely established, in addition to the effect of CFRP configuration; quantitative studies are lacking.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Tensile Properties of CFRP Manufactured by PCM and WCM: Effect of Strain Rate and Configurations

Yang

2021

Crystals

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Carbon fiber-reinforced plastic (CFRP) is a promising material to achieve lightweight automotive components. The effects of the strain rate and configurations of CFRP on dynamic tensile properties have not yet been fully explored; thus, its lightweight benefits cannot be maximized. In this paper, the dynamic tensile properties of CFRPs, tested using two different processes with two different resins and four different configurations, were studied with a strain rate from 0.001 to 500 s−1. The tensile strength, modulus, failure strain, and fracture mechanism were analyzed. It was found that the dynamic performance enhances the strength and modulus, whereas it decreases the failure strain. The two processes demonstrated the same level of tensile strength but via different fracture mechanisms. Fiber orientation also significantly affects the fracture mode of CFRP. Resins and configurations both have an influence on strain rate sensitivity. An analytic model was proposed to examine the strain rate sensitivity of CFRPs with different processes and configurations. The proposed model agreed well with the experimental data, and it can be used in simulations to maximize the lightweight properties of CFRP.

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“…Since many studies proved that the DIC method is very flexible, robust, and easy to use, the DIC method is widely used for strain measurement on non-uniform deformation and fracture of CFRP. 15–19…”

Section: Introductionmentioning

confidence: 99%

Tensile properties of CFRP manufactured by resin transfer molding considering stacking sequences at various strain rates

Yoo

Huh

Lim

et al. 2019

Journal of Composite Materials

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This paper is concerned with the improvement of a tensile test method and the material properties of carbon fiber reinforced polymer manufactured by resin transfer molding considering stacking sequences at various strain rates for auto-body. Auto-body structure experiences the strain rates up to several hundreds per second during car crash. In order to apply the carbon fiber reinforced polymer panel into auto-body structures, it is critical to acquire the material properties of carbon fiber reinforced polymer at various strain rates considering stacking sequences. The tensile test method is improved for acceptable test results. Test specimens are modified for high-speed tensile tests of carbon fiber reinforced polymer in order to achieve designated strain rates and eliminate the effect from unfavorable conditions of inhomogeneity of deformation. Various types of grip tab materials are employed for acceptable failure modes. Tensile tests have been carried out with non-crimp fabric made by 50K high strength carbon fiber (NCF) and woven fabric made by a 2/2 twill pattern of 3K high strength carbon fiber (TWILL) with different stacking sequences of 0° and 90° unidirectional cases as well as [0°/90°] and [45°/−45°] symmetric cases. Digital image correlation method and force equilibrium grid method are adopted for strain and stress measurement of a carbon fiber reinforced polymer specimen during a tensile test. The material properties acquired indicate that the carbon fiber has little rate dependency, while the epoxy matrix has remarkable rate hardening at strain rates from 0.001 s−1 to 100 s−1.

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Evaluation of the effect of the strain rate on the tensile properties of carbon–epoxy composite laminates

Cited by 30 publications

References 22 publications

The Off-Axis IBII Test for Composites

The Off-Axis IBII Test for Composites

Dynamic Tensile Properties of CFRP Manufactured by PCM and WCM: Effect of Strain Rate and Configurations

Tensile properties of CFRP manufactured by resin transfer molding considering stacking sequences at various strain rates

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