Evaluation of quasi-static indentation response of superelastic shape memory alloy embedded GFRP laminates using AE monitoring

In this work, the failure mode and ballistic protection capability of the carbon fiber aluminum alloy laminated target plate under the impact of high‐speed projectile body were studied by ballistic impact test. The effects of the lamination sequence and warhead shape difference on the impact resistance of the laminated aluminum alloy and carbon fiber laminates were analyzed. Two kinds of projectile bodies, flat and oval head, were used to carry out multiple high‐speed impact experiments on four groups of targets with different stacking sequences. By analyzing the result, it is found that the lamination sequence of the target plate has a significant effect on the anti‐impact performance only when the flat head projectile impacts, while the ovoid projectile has almost no effect. In the fiber‐metal composite configuration, the aluminum plate placed in front of the carbon fiber plate showed the best resistance to flat head bullet impact, the ballistic limit speed reached 135 m/s, and the overall impact resistance improved by up to 26% compared with other configurations. Unlike the shear failure caused by flat head projectile, ovoid projectile impact can cause serious tensile and tear damage. Based on the experimental results, it is clear that the laminated structure has better penetration resistance against the flat head projectile, and the placement of aluminum plate on the impact surface can change the failure mode of carbon fiber laminates and improve the energy absorption level of composite plates.Highlights Unlike traditional fiber‐metal laminates, the target plate used in this experiment does not use adhesive, which makes the deformation of the two materials will not affect each other, which is conducive to the study of its own impact resistance. The mechanical behavior and damage failure mode of the target plate under high speed impact load were studied. The impact of ovoid projectile changes the damage failure mode of the target plate. For the configuration of fiber‐metal laminates, the ballistic limit value is as low as 100 m/s, and the energy absorption value fluctuates in the range of 145–190 J with the change of impact velocity. Compared with ovoid projectile, laminated material has stronger impact resistance to flat head projectile. The metal plate arranged on the impact surface can change the damage mode from shear failure to tensile failure, thus greatly improving the ballistic limit and impact resistance, overall impact resistance can be improved by up to 26%.

Section: Introductionmentioning

confidence: 99%

Effect of lamination sequence and warhead shape on impact resistance of fiber‐metal laminates

Wei,

Hao,

et al. 2023

“…Numerous studies have investigated the bending properties of composite materials using acoustic emission (AE) equipment to observe composite failure, and determine the initial critical failure load of the composite by AE data. [17][18][19][20][21][22][23] Zhang et al 24 recorded the bending process of 3D braided composites by AE, and extracted the progressive damage using micro-CT, which was then compared with AE results.…”

Section: Introductionmentioning

confidence: 99%

Effect of triaxial woven fabric on bending properties of unidirectional composites

2023

This study investigates the impact of incorporating a triaxial woven fabric (TWF) into a unidirectional ply structure on the bending performance of the structure. The failure processes of the different ply structures were recorded using video analysis and acoustic emission. The experimental results indicated that incorporating a layer of carbon fiber TWF between the second and third layers (GGTGG) or between the third and fourth layers (GGGTG) of the four‐layer unidirectional fabric significantly improved the flexural strengths by 79.5% and 213.7%, respectively, and the flexural toughness by 480.3% and 324.8%, respectively. In addition, the incorporation of TWF in the structure resulted in a shift in the overall failure mode from brittle to ductile. When the TWF was closer to the lower surface of the sample, the crack was more uniform and the distribution range was wider. In contrast when the TWF was in the middle, the range of cracks generated by the sample was narrower. However, some of these cracks affected the stability of the material structure. Furthermore, the damage process was confirmed using images of crack growth and acoustic emission during the destruction process. This study provides valuable insights into enhancing the bending performance of unidirectional fiber layup in the non‐load direction.

“…In addition, as the impact load is applied to the material in milliseconds, it is difficult to obtain detailed information about the linear part of the impact mechanism and damage initiation 20 . So, the quasi‐static indentation (QSI) test can be used to characterize the through‐thickness behaviors of composites and give accurate information about failure mechanisms, perforation performance, and friction forces 21,22 …”

Section: Introductionmentioning

confidence: 99%

Investigation of the effects of hybridization types and temperature on the quasi‐static indentation properties of glass/flax hybrid composites for various test speeds

Korkmaz

Karakuzu

2023

Hybridizing man-made fiber composites with natural fibers has been chosen for numerous structural or semi-structural applications over the last several decades. Even though several studies have been conducted to determine the mechanical properties of inter-ply hybrid composites, the effects of hybridization on the out-of-plane mechanical properties of hybrid composites still need to be clarified. The mechanical properties of hybrid composites at low temperatures are another significant matter to be elucidated. In this study, E-glass and flax yarns were used to produce woven fabrics to obtain intra-and interply hybrid composites. They were then subjected to the quasi-static indentation test at À30 C, 25 C, and 60 C. It was concluded that, according to the hybridization type, an improvement or decrease can be obtained in the mechanical properties of hybrid composites. The contact force and energy absorption properties of pure glass composite could be increased at 8.88% and 3.87% proportions respectively, thanks to the intra-ply hybrid composite-1 in the study. Furthermore, the through-thickness properties and damage mechanisms of hybrid composites were profoundly affected by the temperature.