Experimental evaluation of filled-hole compressive strengths of thin-ply carbon fiber / epoxy composite laminates

Ogasawara, Toshio; Mikami, Tomoisa; Takamoto, Kota; Asakawa, Kenji; Aoki, Kazuyuki; Uchiyama, Shigekazu; Sugimoto, Sunao; Yokozeki, Tomohiro

doi:10.1016/j.compscitech.2023.109996

Cited by 5 publications

(1 citation statement)

References 18 publications

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“…Moreover, since greater deformation is required to develop a through-fastener load path in holes having a diameter tolerance of 2 mm, less stress concentration relief is expected around the bolted assembly. In this concern, as Sawicki and Minguet [48], Kelly and Hallström [49], and recently Ogasawara et al [50] highlighted, bolt hole clearance affects filled hole strength capability to a greater degree than any other geometric factor. According to the same references, through-thickness restraint of laminate deformation provided by the wide and flat anti-buckling plates significantly increases the filled hole bearing strength.…”

Section: Resultsmentioning

confidence: 99%

Another Compression after Low-Velocity Impact Test Setup: A Case Study of Reversing the Symmetric Lay-Up for an Angle-ply CFRP Laminated Composite

Baba

2024

Preprint

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This paper reports an experimental investigation on compression after low-velocity impact response for two lay-up configurations of symmetric CFRP laminated composite specimens obtained by reversing their angle-ply orientation, namely [0/-45/45/90]s versus [90/45/-45/0]s, the impact velocity of the projectile up to the BVID level being subsequently considered. To this aim, a modified Compression-After-Impact (CAI) test device is proposed that involves clamping the specimen's upper and lower edges between two adjustable wide and flat anti-buckling plates through a removable bolt-nut assembly. Such a solution relies on the fact that the specimen's active length is shortened, reducing the risk of global buckling. Besides, the bolts carry part of the load with minor localized bearing damage, provided that the metallic plates act as washers by supporting the bolt-bearing region laterally, thus avoiding crashing failures at the specimens’ loaded edges. With these settings, roughly the same percent decrease in the average values of maximum compression load (i.e., 22%) was recorded for both lay-up configurations impacted up to their BVID threshold, whereas in terms of compressive stiffness behavior, a reduction of 17 % was found for [0/-45/45/90]s specimens compared to 6 % obtained for [90/45/-45/0]s specimens.

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Section: Resultsmentioning

confidence: 99%

Another Compression after Low-Velocity Impact Test Setup: A Case Study of Reversing the Symmetric Lay-Up for an Angle-ply CFRP Laminated Composite

Baba

2024

Preprint

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Preparation and characterization of carbon fiber spread tow needled preform and its composite based on novel short yarn needling method

Guo,

Chen,

Ren

et al. 2024

Polymer Composites

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Due to the high fiber volume fraction of carbon fiber spread tow plain weave fabrics, it is difficult for short fibers to be brought into the thickness direction to form needled fiber bundles during the needling process. The interlaminar performance of the carbon fiber spread tow needled preform is weak, and the in‐plane damage is also severe. Responding to this issue, this article proposed a new method for preparing carbon fiber spread tow needled preform based on short yarn needling, which was expected to manufacture high‐performance carbon fiber spread tow needled preform and composite. We conducted experimental research on the preparation and structural characterization of the preform, as well as the Mode I interlaminar mechanical properties and in‐plane tensile properties of composites. The results showed that the fiber volume fraction of the preform significantly increased, reaching to 55.7%–56.1%, which was 25.5%–25.9% higher than that of traditional needled preform. The Mode I interlaminar property of carbon fiber spread tow needled composite reached to 905–4376 J m−2, which was improved by 29.3%–525.1% and 125.8%–1054.6% compared to traditional needled composite and laminated composite, respectively. At the same time, the tensile strength and tensile modulus were also improved by 191.5%–212.2% and 66.2%–78.1% compared to traditional needled composites. The preparation method of carbon fiber spread tow needled preform based on short yarn needling has laid the foundation for the 3D printing molding of dry fiber fabrics and is expected to be applied to high‐quality needling of high thickness and large curvature‐shaped fabric preforms.Highlights A novel method was proposed for preparing high‐performance carbon fiber spread tow needled preform based on short yarn needling. The fiber volume fraction of novel carbon fiber spread tow needled preform significantly increased, reaching to 55.7%–56.1%. The GIc of the novel carbon fiber spread tow needled composite was improved by 29.3%–525.1% compared to the traditional needled composite. The tensile strength and tensile modulus were also improved by 191.5%–212.2% and 66.2%–78.1%, compared to traditional needled composites.

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Compressive behaviors and deformation mechanism of carbon fiber reinforced epoxy composites: A microscopic and molecular dynamics perspective

Chen,

Li,

et al. 2024

Polymer Composites

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Investigating the macro‐mechanical properties of polymer composites at the nanoscale is a challenging topic. Here we report the compressive performances of carbon fiber‐reinforced epoxy composites using molecular dynamics (MD) simulations. The evolution of microstructure and microscopic energy, including free volume, radius of gyration, dihedral angle, potential energy, and interaction energy, has been investigated to characterize compressive behaviors at the nanoscale. Molecular chains gradually bend, and the movement space of the molecular chains decreases during compression loading. The radius of gyration and dihedral angle are deformed into a state of irreversible plasticity to accommodate the microstructural transformation. The interaction energy increases and subsequently declines as the carbon fiber/epoxy interface gets closer, reflecting the transition of the internal structure. The inhomogeneity and interfacial concentration distribution of stress, and local molecular stiffness under various strains have been obtained to reveal the nanoscopic mechanism of epoxy failure and interface delamination during compression. This study reveals the compression behaviors and deformation mechanism of carbon fiber‐reinforced epoxy composites at the molecular level, providing directions and possibilities for molecular design and structural optimization of composites.Highlights The nanoscopic compression deformation of CFRP composites is studied. Microstructural evolution and conformation transformation are revealed. The evolution and transition of microscopic energy are analyzed. Micro‐mechanism of epoxy deformation and interface delamination is elucidated.

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Experimental evaluation of filled-hole compressive strengths of thin-ply carbon fiber / epoxy composite laminates

Cited by 5 publications

References 18 publications

Another Compression after Low-Velocity Impact Test Setup: A Case Study of Reversing the Symmetric Lay-Up for an Angle-ply CFRP Laminated Composite

Another Compression after Low-Velocity Impact Test Setup: A Case Study of Reversing the Symmetric Lay-Up for an Angle-ply CFRP Laminated Composite

Preparation and characterization of carbon fiber spread tow needled preform and its composite based on novel short yarn needling method

Compressive behaviors and deformation mechanism of carbon fiber reinforced epoxy composites: A microscopic and molecular dynamics perspective

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