Impact compression damages of 3D braided composites with/without axial yarns after thermo-oxidative ageing

Self Cite

Defect effects of carbon fiber composites under dynamic impact conditions are important to mechanical behavior design in the aerospace field. Here we report the defect effect on the impact compressive behavior of 3D braided composites at high strain rates from 550/s to 1240/s. The defect effect on damage behavior was observed by high-speed photography and digital image correlation (DIC) technology. A finite element analysis (FEA) model was developed to show the defect effect on stress distribution and thermo-mechanical behavior. The defect structure reduces the compressive strength of the composite and causes more brittle and catastrophic failure compared with the perfect composite. The defect effect on the compressive behaviors is more significant at higher strain rates. FEA results show that the defect structure causes local stress concentration, high adiabatic temperature rise, and high stress in the X-shaped shear band region, thereby accelerating composite failure.

Section: Damage Criteriamentioning

confidence: 99%

“…The elastic behavior of yarns follows Hooke's law. Hill’s yield model was used to define the anisotropic plastic behaviors of the yarns (Long et al., 2022). Hill’s yield criterion considers the anisotropy of the elastic parameters and the anisotropy of the yield strength.…”

Section: Fea Modelingmentioning

confidence: 99%

Defect effect on high strain rate compressive behaviors of 3D braided composites

Guo,

Xue,

et al. 2024

Self Cite

“…The deformation characteristics of the materials are more complex (Sobczyk et al., 2021). Relevant research on materials under high impact loading conditions has generally used split Hopkinson pressure bar (SHPB) devices (Chen and Song, 2011; Chunyu et al., 2022; Fu et al., 2019; Leclair et al., 1999; Li et al., 2023; Long et al., 2022; Shangguan et al., 2020; Tao et al., 2023; Yu et al., 2023; Zhao et al., 2022). Researchers have conducted detailed investigations of impact dynamic constitutive models through damage mechanics (Cao et al., 2017; Zhang et al., 2021; Zhu et al., 2019, 2020), macroscopic–mesoscopic mechanics (Xie et al., 2016; Zhu et al., 2018), and energy characteristic theories (Ma et al., 2021; Shangguan et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Dynamic constitutive model of saturated saline frozen soil under uniaxial impact loading

Shang,

Zhu,

et al. 2024

The soil matrix, salt crystals, ice crystals, and pore solutions constitute the composite geological material of saturated saline frozen soil. The destruction mode and dynamic constitutive model of saturated saline frozen soil need to be studied because infrastructure construction is increasingly being extended to regions with saturated saline frozen soil. Based on the split Hopkinson pressure bar device, uniaxial impact compression tests were conducted on frozen soil samples with different salt contents under different strain rates. The strain rate of saturated saline frozen soil must be emphasized based on the results. The gradient of the elastic segment and maximum stress of the soil are negatively correlated with the salt content increase. To further explore the failure mechanism, the study examined the damage and failure behavior of saturated saline frozen soil, along with the absorption energy in the failure process. According to the test results, the saturated saline frozen soil was similar to a particle-reinforced composite. Subsequently, the debonding damage of the ice–salt eutectic and the mechanical–chemical damage of the soil matrix were considered. The test results could be predicted accurately from the results of the model, verifying that the influences of the salt content and strain rate are reasonably considered by the constructed model.

“…The application of 3D woven composites has gradually changed from functional materials to secondary and main load-bearing components, so higher requirements are put forward for its mechanical properties (Dewangan and Panigrahi, 2020a, 2020b; Lu et al., 2018; Pan et al., 2021). The structural stability of reinforcements in 3D woven composites has great influence on the mechanical properties (Cao et al., 2019; Long et al., 2022; Wei et al., 2021). To meet the requirements of high modulus in both warp and weft directions, 3D woven composites with special structural reinforcements are urgently needed to be investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of fabric structural stability on the tensile property of bidirectional angle-interlock woven composites

Man

et al. 2023

Three-dimensional bidirectional angle-interlock woven (3DBAW) composites exhibit the orthogonal high modulus, which has the potential to be used in load-bearing components. 3DBAW preforms prepared using the certain and uncertain cross-sectional yarns exhibit various structural characteristics, and the mechanical properties of composites show the high variation. To investigate the effect of fabric structural stability on the elastic properties of 3DBAW composites and broaden its application, contrast analysis of quasi-static tensile properties of composite specimens was proposed, and the failure mechanism was analysed. The results showed that the high tensile initial elastic modulus of 3DBAW composites was attributed to the low curvature of load-bearing yarns. For composites with stable fabrics, the tensile process was smooth and steady owing to the uniform fiber spacing, and the tensile elastic modulus and strength show the smaller coefficient of variation. The tensile crack surfaces of composites with stable structural fabrics were regular, and making the full use of the load-bearing yarns. 3DBAW preforms with stable structure can effectively reduce the fluctuation of changes at the initial stage of loading, and the translaminar fracture and adhesive matrix failure are the main failure modes without the obvious interlaminar fracture. The results provided the support for the application of 3DBAW composite in load-bearing components.