Experimental Study on the Compressive Properties of a Kind of Carbon/epoxy Composite

Tian, Chun Lei; Pi, Aiguo; Feng, Hao

doi:10.4028/www.scientific.net/amm.66-68.130

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…Wang et al [15] found that the main failure modes of CF/PPS composites were delamination accompanied by shear failure under in-plane compression loads, and warp fiber bundle breakage under out-of-plane compression loads. Tian et al [16] reported that carbon/epoxy composite laminates exhibited unique characteristics in each of the three principal directions. However, there is still relatively limited knowledge regarding the quantitative characterization of dynamic mechanical properties for assessing ballistic performance.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental study on ballistic performance of CFRP laminates under high velocity impact

Zhang,

Yao,

Dai

et al. 2024

Preprint

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This work investigated the ballistic performance of CFRP laminates with different thicknesses using a ballistic gun testing apparatus. By combining high-speed camera and recovered target plates, the failure mechanisms of CFRP laminates under high-velocity impact were revealed. The results showed that due to the combined action of compressive and shear loads, fiber fracture, matrix crushing, and splitting along the fiber direction mainly occurred on the impact face of the target plate. The back face of the target plateprimarily appeared fiber fracture and delamination failure under tensile loading condition. When the projectile impact velocity exceeds the ballistic limit, the energy absorption value of the target plate becomes relatively flat, and the average energy absorption and the ballistic limit of CFRP laminates of the target plate increases with the increase of plate thickness. The rigid projectile perforation model by Chen & Li can predict the ballistic performance of spherical projectiles impacting CFRP laminates at high velocity well. Furthermore, it’s better to match the theoretical prediction model of the target plate inertia effect and the experimental data.

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Section: Introductionmentioning

confidence: 99%

Theoretical and experimental study on ballistic performance of CFRP laminates under high velocity impact

Zhang,

Yao,

Dai

et al. 2024

Preprint

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“…Besides, it should be noted that in the experimental results of quasistatic compression, the stress-strain curve of epoxy resin shows nonlinear characteristics at the initial stage, 19 which will lead to the initial nonlinear behavior of CFRP. 2,20 Therefore, in addition to considering the thermomechanical coupling effect of instantaneous impact temperature generation at high strain rate, the initial nonlinear effect at a low strain rate also needs to be considered in order to form a complete and accurate mechanical behavior of CFRP. Although there are other problems to consider for the CFRP laminates, such as intralaminar damage, delamination evolution, microscopic failure modes, 21,22 etc., the present paper focuses only on the macroscopic thermomechanical coupling problems related to strain rate and temperature rise.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, it should be noted that in the experimental results of quasistatic compression, the stress–strain curve of epoxy resin shows nonlinear characteristics at the initial stage, 19 which will lead to the initial nonlinear behavior of CFRP 2,20 . Therefore, in addition to considering the thermomechanical coupling effect of instantaneous impact temperature generation at high strain rate, the initial nonlinear effect at a low strain rate also needs to be considered in order to form a complete and accurate mechanical behavior of CFRP.…”

Section: Introductionmentioning

confidence: 99%

Complete constitutive model of CFRP including continuous damage in low strain rate compression and temperature generation in high strain rate impact

Zhao,

Zhong,

Wang

et al. 2023

Polymer Composites

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This paper reports a method to construct the complete constitutive model of carbon fiber‐reinforced plastic (CFRP) by distinguishing the strain rate state and modifying the material stiffness. In quasistatic (low strain rate) compression, the initial nonlinear effect caused by the material defects was described by introducing an nonlinear increasing factor. In dynamic (high strain rate) impact, the nonlinear strengthening effect was described by introducing the dynamic amplification factors of stress and strain based on the reference state. Considering the instantaneous temperature rise obtained from the impact work–temperature generation equation and the influence of temperature on modulus and strength, the coupled thermomechanical constitutive models combining the strain rate effect and the temperature effect were established. The user‐defined material subroutines (VUMAT) were developed, and then these constitutive models were verified by finite element analysis (FEA). Finally, the developed material subroutine was applied to predict the impact penetration of CFRP laminates, and the results show that the opening holes, damage and energy dissipation are in good agreement with the reference experiment. This work comprehensively analyzed the construction method of CFRP constitutive models, which would provide a guidance for the coupled thermomechanical behavior under dynamic impact.Highlights An anisotropic continuum mechanical constitutive behavior considering strain rate effect and damage evolution behavior was established. A macroscopic anisotropic constitutive model including the coupled impact temperature generation‐mechanical behavior was established. Combined with the incremental finite element method, the three‐dimensional user‐defined material subroutines (VUMAT) were developed and verified. The thermomechanical impact penetration behaviors of CFRP laminates was predicted, and the stress field, temperature field and failure characteristics were visualized.

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“…Tian studied the compression performance of carbon/epoxy composite by SHPB, and the stressstrain curve was obtained by experiment. 6 Soutis carried out the compression test of carbon fiber-epoxy cylindrical rods. 7 Their materials were T300/828, and the diameter of specimen was 4 mm.…”

Section: Introductionmentioning

confidence: 99%

Research on compression properties of unidirectional carbon fiber reinforced epoxy resin composite (UCFREP)

Zhao

Zhou

Changxing

et al. 2020

Journal of Composite Materials

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To research the axial compression properties of unidirectional carbon fiber reinforced epoxy resin composite (UCFREP), the compression experiments at different strain rates were carried out by using the MTS universal electronic testing machine and the equipment of split Hopkinson pressure bar (SHPB). Furthermore, the finite element analysis (FEA) was also used to study the compression properties of UCFREP with different conditions. The true stress-strain curves in quasi-static and dynamic compression were obtained, and the relationship between yield limit and strain rate was coupled. The microstructure of the failure area was observed by scanning electron microscope (SEM). A formula for predicting compression strength of combined buckling under the quasi-static condition was presented. The application range of Chang-Chang failure criterion was discussed by FEA, and the compression failure of UCFREP with different fiber directions was predicted. The results show that UCFREP has the obvious strain rate effect, the mechanical properties at dynamic compression are nonlinear. Shear is the main compression failure mode, which includes the shear cracking of matrix between fibers and the shear buckling of fiber. The direction of the fiber is the main factor that causes the shear cracking, such as the shear cracking shows the feature of 45° when the direction of the fiber is 45°. As a conclusion, increasing the shear strength of matrix and fiber will be a way to increase the compression strength of UCFREP. This paper could be used as a reference to develop the new constitutive model, especially considering the nonlinear effect.

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Experimental Study on the Compressive Properties of a Kind of Carbon/epoxy Composite

Cited by 5 publications

References 9 publications

Theoretical and experimental study on ballistic performance of CFRP laminates under high velocity impact

Theoretical and experimental study on ballistic performance of CFRP laminates under high velocity impact

Complete constitutive model of CFRP including continuous damage in low strain rate compression and temperature generation in high strain rate impact

Research on compression properties of unidirectional carbon fiber reinforced epoxy resin composite (UCFREP)

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