Thermal Expansion Process for Manufacturing of Stitched Sandwich Structures

Zhang, Zuoguang; Jijun, Hao; Sun, Zhonggang; Li, Min; Gu, Yi

doi:10.1177/0731684409103960

Cited by 4 publications

(1 citation statement)

References 11 publications

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“…The experimental results demonstrated that silicone rubber core mold with proper aperture effectively avoided resin-rich defect at corner region, and then optimal design for aperture diameter and thermal deformation of core mold were investigated through FEA. In addition to adjusting the structure of core mold, a lot of researches of designing process gap between core mold and external rigid mold have been conducted, aiming at controlling thermal expansion pressure in a reasonable range [23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies on compaction of carbon fiber composite joint with variable cross‐section using thermal expansion process

Zhang

Liang²,

et al. 2018

Polymer Composites

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For hollow composite with complex shape, thermal expansion process is usually used to ensure uniform compaction pressure and excellent processing quality. This study focused on compaction of carbon fiber/epoxy matrix composite joint with variable cross‐section using thermal expansion process. Three kinds of silicone rubber core molds were adopted and experiments were performed to study the effect of elastomer core mold on resin pressure distribution inside prepreg stack during process and processing quality of composite joint. Moreover, based on numerical analysis, thermal expansion behaviors of different core molds and compaction pressure on prepreg stack were studied. The results indicate that material properties and geometric structure of core mold significantly influence thermal expansion behavior of core mold and compaction pressure distribution on prepreg stack. Due to irregular shape of core mold, thermal expansion of core mold at the regions with different cross‐sections is obviously uneven. And core mold with large coefficient of thermal expansion and small compressive modulus is more likely to fill process gap and achieve uniform compaction pressure distribution on prepreg stack. Therefore, controlling thermal expansion behavior of core mold to improve processing quality of composite involves reasonable material properties of core mold and adjusting process gap at different cross‐sections of composite. POLYM. COMPOS., 40:E1057–E1074, 2019. © 2018 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies on compaction of carbon fiber composite joint with variable cross‐section using thermal expansion process

Zhang

Liang²,

et al. 2018

Polymer Composites

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Effect of stitch on thermodynamic properties of sandwiched thermal protection structures

Mao

Pei

et al. 2013

Composite Structures

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Effects of stitching parameters on the flexural properties of stitched foam core sandwich composites

Rasouli Rizi,

Nosraty,

Mirdehghan

2024

Journal of Composite Materials

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One of the primary challenges faced by sandwich composites is facesheet-core debonding, which can be mitigated through various techniques such as z-pinning and stitching through the thickness. This study investigates the impact of stitching on the bending behavior of sandwich composites comprising E-glass composite facesheets and a polyurethane foam core, employing experimental, numerical, and analytical methods. Specimens were stitched at three stitch spacings of 0.5, 1, and 2 cm, with a stitch pitch of 0.8 cm and stitch seam angles of 0°, 90°, 0/90°, ±45°, 45°/90°, and ±60°. Analysis of facesheet bending stress, core shear stress, and bending rigidity of stitched specimens was conducted through three-point bending tests and compared with unstitched specimens. Results indicate that reducing stitch spacing, thereby increasing stitch density, improves bending strength, and the best bending behavior observed at ±45° stitch seam angles. Damage assessment revealed fractures and depression of the foam, wrinkles on the upper facesheet, and buckling failure of resin columns. Additionally, a theoretical model predicted bending rigidity, showing good agreement (4%–15%) with experimental data. Finite element analysis using the ABAQUS program validated the experimental results, suggesting numerical modeling as a viable method for predicting flexural properties of stitched foam core sandwich composites.

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Thermal Expansion Process for Manufacturing of Stitched Sandwich Structures

Cited by 4 publications

References 11 publications

Experimental and numerical studies on compaction of carbon fiber composite joint with variable cross‐section using thermal expansion process

Experimental and numerical studies on compaction of carbon fiber composite joint with variable cross‐section using thermal expansion process

Effect of stitch on thermodynamic properties of sandwiched thermal protection structures

Effects of stitching parameters on the flexural properties of stitched foam core sandwich composites

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