Influences of ply waviness and discontinuity on automated fibre placement manufactured grid stiffeners

Zhao, Cong; Donough, Matthew J.; Prusty, B. Gangadhara; Xiao, Jun

doi:10.1016/j.compstruct.2020.113106

Cited by 11 publications

(1 citation statement)

References 42 publications

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“…A large number of studies have shown that the mechanical properties of the interface are different from those of the matrix. [11][12][13][14][15] Therefore, the stress on the interface will be underestimated from the matrix's stress approximation, resulting in inaccurate prediction of the failure strength of the composite. In our work, an improvement is made on the basis of original RVE, namely, the RVE is geometrically decomposed into three parts, fiber region, matrix region, and a zero thickness interface layer which is inserted by the function of high version ABAQUS.…”

Section: Introductionmentioning

confidence: 99%

Micro failure analysis of fiber metal laminates

Lin

Cheng

Dai

et al. 2022

Journal of Reinforced Plastics and Composites

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In the failure analysis of composite materials, the damage of fiber and matrix is always noticed rather than the debonding of interface which is responsible for transferring the load between matrix and fiber. The stress amplification factors of fiber, matrix, and interface were extracted by establishing representative volume element model with interface and the strength of corresponding constituent is calculated in our work. Micro mechanics of failure served as the initial failure criterion of material components, and user-material subroutine (UMAT) was applied to realize progressive damage analysis of fiber metal laminate (FML) under different loading angles. The analysis results show that it is not strictly correct to directly use the stress on the matrix to calculate interface stress, and the damage trend of interface is consistent with that of fiber. The strain hardening phenomenon of FML decreases with larger loading angle, and the mechanical response of FML is about 45° symmetric due to its structure symmetry. The simulation results are in good agreement with the experiment results.

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Section: Introductionmentioning

confidence: 99%

Micro failure analysis of fiber metal laminates

Lin

Cheng

Dai

et al. 2022

Journal of Reinforced Plastics and Composites

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Study on Mode I interlaminar fracture behavior of automated fiber placement in situ consolidation thermoplastic composite considering the influence of roller compaction pressure

Liu,

He,

Zou

et al. 2024

Polymer Composites

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This study delved into the Mode I fracture behavior of laser‐assisted automated fiber placement (AFP) in situ consolidated thermoplastic composite laminates under different curing pressures. In compliance with ASTM D5528 standards, T700 carbon fiber reinforced polyether ether ketone (T700‐CF/PEEK) double cantilever beam (DCB) specimens were fabricated and segregated into three test groups subjected to distinct roller pressures: DCB‐100N, DCB‐500N, and DCB‐1500N. The fracture toughness of these specimens was then inversely characterized by employing an optimized ASTM‐based data reduction methodology. A kind of tri‐linear cohesive zone model (CZM) incorporating the fracture process zone (FPZ) length was developed to simulate delamination behavior, showing good agreement between experimental results and simulation predictions. Compared with the other two test groups, DCB‐1500N specimens have more inter‐laminar bridging fibers and higher propagated toughness. Although the length of fiber bridging area is shorter, the fiber bridging density is higher, so the influence of fiber bridging on toughness is more pronounced in the DCB‐1500N specimens. This study provides theoretical guidance for the impact resistance design of thermoplastic composites (TPCs), offering valuable insights into the intrinsic relationship between material processing and fracture damage mechanisms.Highlights Explore the characteristic interlaminar fracture behavior of thermoplastic laminates made by AFP under different curing pressures. Develop a more accurate tri‐linear CZM model to describe the plastic deformation at crack tips and fiber bridging during the delamination process. Unveil the intrinsic relationship between AFP curing pressure and ductile fracture mechanism of thermoplastic composites.

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