A novel method for the characterization of through-thickness shear constitutive behavior of composites

Hao, Ziqing; Ke, Hongjun; Li, Na; Wang, Xiaoyu; Li, Jinming; Liu, L.

doi:10.1016/j.compscitech.2023.109919

Cited by 3 publications

(3 citation statements)

References 32 publications

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“…As plastic deformation and damage are accumulated, when the middle layer breaks, the failure of the main bearing layers decrease the stiffness of the entire specimen, and the surface STW 1 /nonwoven 1 layers structure fails to bear the residual stress after fracture; therefore, S1_4h shows a higher load decline rate, reaching 41%, which is significantly higher than that of the other components of the specimen. The strain nephogram shows that the main strain locations occur under the loading point and within the support point area, with an oblique distribution at a 45° angle, indicating that the loading area bears all shear loads and exhibits a typical shear failure 29,30 . The shear strengths of specimens with the same thickness in the middle layer are similar, indicating that the STW/nonwoven layers on the surface have little influence on the shear resistance.…”

Section: Resultsmentioning

confidence: 98%

“…The strain nephogram shows that the main strain locations occur under the loading point and within the support point area, with an oblique distribution at a 45 angle, indicating that the loading area bears all shear loads and exhibits a typical shear failure. 29,30 The shear strengths of specimens with the same thickness in the middle layer are similar, indicating that the STW/nonwoven layers on the surface have little influence on the shear resistance. The three groups of 4 h samples have a high strength and higher specific strength because of the lower fiber content compared with that of STWS, indicating that this antisandwich structure has a better synergistic effect and higher material utilization.…”

Section: Samplementioning

confidence: 98%

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Short beam shear performance of spread‐tow woven stitched composite with anti‐sandwich structure

Jiang,

Lian,

Liu

et al. 2024

Polymer Composites

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Spread‐tow woven fabrics (STW) have attracted considerable attention because of their ultrathin structure and low porosity, which benefit the design and application of STW composites. Little is known about how the thickness relationship between the middle and surface layers affect the mechanical properties of sandwich structures. Therefore, this study developed an anti‐sandwich stitched composite with STW in the center and a nonwoven felt/STW hybrid on both sides. The interlayer shear behavior and damage mode transformation of STW composites with different middle‐layer thicknesses were studied using short‐beam shear tests, digital image correlation (DIC) full‐field strain nephograms and micro‐computed tomography (micro‐CT). The results showed that the anti‐sandwich structure improved the shear strength, particularly when the middle layer thickness was four times that of the surface layer. As the middle layer thickness ratio decreased, the synergistic effect of the anti‐sandwich structure was weakened, and the damage mode changed from ductile to brittle. Furthermore, the hybrid ratio of the STW/nonwoven fabric in the surface layer had little effect on the performance because of the good interfacial adhesion between the STW and nonwoven fabric. The anti‐sandwich structure that can improve the properties and stability of STW composites provides a reference for the structural design of STW composites in engineering applications.Highlights An anti‐sandwich composite was developed by spread tow woven fabrics. Nine types of anti‐sandwich composite were designed and fabricated. The thickness of the middle layer affected the synergistic mechanisms. The optimal anti‐sandwich structure has a 4.59% increase in shear strength. The specific shear strength is 14.86% higher over pure spread tow laminates.

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Section: Resultsmentioning

confidence: 98%

Section: Samplementioning

confidence: 98%

Short beam shear performance of spread‐tow woven stitched composite with anti‐sandwich structure

Jiang,

Lian,

Liu

et al. 2024

Polymer Composites

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“…However, strain gages are localized, highly dependent on the measuring position and on the length of the gage 17 . In order to tackle this issue, full‐field strain measurement techniques such as digital image correlation (DIC) have been increasingly used in the characterization of FRPCs 18–21 . In spite of this progress, the use of full‐field strain measurements to investigate the advantages and caveats of existent TT specimens or to design new ones, has not been extensively explored.…”

Section: Introductionmentioning

confidence: 99%

Through‐thickness tensile characterization and analysis of fiber‐reinforced polymer composites using digital image correlation and finite element modeling

Ayuso‐Faber,

Uribe‐Riestra,

Arana

et al. 2023

Polymer Composites

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Digital image correlation (DIC) and finite element analysis (FEA) are used to assess the cylindrical spool‐shaped ASTM D7291 and I‐beam‐shaped specimens for through‐thickness (TT) mechanical characterization of thick (~25 mm) fiber reinforced polymer matrix composites. The composites are made of E‐glass woven fabrics reinforcing a vinyl ester matrix. DIC full‐field measurements and FEA showed a rather uniform strain distribution within the gage section of the ASTM D7291 specimen. However, strain concentrations are revealed at the bondlines between the end‐tabs and the test specimen, in addition to strain gradients at the curved section of the specimen. DIC‐measured and FEA‐predicted strain fields of the I‐beam specimens exhibited a region of uniform strain distribution within the gage section larger than that of the ASTM D7291 specimen. Nevertheless, high stress concentrations at the fillet (curved flange‐to‐web transition) regions and some amount of web bending occur in the I‐beam specimen. Beyond providing the TT mechanical properties of the E‐glass woven/vinyl ester composites, the current work discusses advantages and caveats of both promising specimens, providing quantifications of stress concentration factors and length of zones were strains and stresses may be considered uniform.Highlights Stress/strain distributions of through‐thickness tensile specimens are evaluated. The main drawback of the spool‐shaped specimen is adhesive failure. The modified I‐beam specimen shows acceptable stress concentration factors. The modified I‐beam is adequate for strength and Poisson ratio characterization. I‐beam specimens are easier to manufacture and do not require adhesive joints.

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Experimental and numerical investigation on the size effect of interlaminar shear strength for thick composites

Hao,

Wang,

et al. 2025

Composite Structures

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A novel method for the characterization of through-thickness shear constitutive behavior of composites

Cited by 3 publications

References 32 publications

Short beam shear performance of spread‐tow woven stitched composite with anti‐sandwich structure

Short beam shear performance of spread‐tow woven stitched composite with anti‐sandwich structure

Through‐thickness tensile characterization and analysis of fiber‐reinforced polymer composites using digital image correlation and finite element modeling

Experimental and numerical investigation on the size effect of interlaminar shear strength for thick composites

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