“…Experimental pullout curves 12,29 can be used as basis to construct a cohesive traction–separation function that describes the shear behavior of the cohesive interface, as shown in Figure 2. The cohesive traction–separation constitutive relation is expressed in equation (1).…”
Section: A Modified Slm With a Cohesive Fiber/matrix Interfacementioning
confidence: 99%
“… where K 0 is the initial shear stiffness of the cohesive fiber/matrix interface, δ is the tangential displacement of the cohesive fiber/matrix interface. Figure 2.Cohesive traction–separation model: (a) microdroplet pullout test, 29 (b) typical pullout force–displacement curve, 30 and (c) cohesive traction–separation constitutive relation.…”
Section: A Modified Slm With a Cohesive Fiber/matrix Interfacementioning
Section: A Modified Slm With a Cohesive Fiber/matrix Interfacementioning
confidence: 99%
“…28 No study of the stress distribution of short fiber–reinforced composite systems using SLM with consideration of the cohesive behaviors of fiber/matrix interface has been identified, except for the work on fiber pullout from single fiber composites by Chen and Yan. 24 In this work, we used the experimental load–displacement curves microdroplet tests 12,29 to construct cohesion behaviors of the natural fiber/matrix interface and establish a modified SLM to analyze the elastic properties of the SNFRCs. Using this modified SLM, we investigated the effects of cohesive interfacial shear stiffness, elastic properties of the fiber and the matrix, fiber aspect ratio, and average fiber axial stress at the embedded end face of fiber on the stress–transfer characteristics and axial tensile properties of the composite.…”
Natural fiber-reinforced composites are increasingly being used in the industry. The fiber–matrix interfacial properties of the composites are influenced by many factors, including chemical treatment of the natural fiber, type of polymer matrix, composites fabrication method, and process and the service environment of the composites. In this paper, a modified shear-lag model based on a cohesive fiber/matrix interface is proposed and applied to the analysis of the stress–transfer characteristics and the tensile properties of unidirectional short flax fiber-reinforced composites. The model takes into account of the interfacial shear stiffness, bonding strength between fiber end face and matrix, fiber aspect ratio and fiber volume fraction. 3D finite element models of the composites using a cohesive zone method are used to verify the accuracy of the modified shear-lag model. The fiber tensile strength and the composite tensile elastic modulus are significantly influenced by the interfacial shear stiffness, fiber aspect ratio, and fiber volume fraction. The bonding strength between the fiber end face and the matrix only has an effect when the interfacial shear stiffness is low. The predicted results from the modified shear-lag model show good agreement with the finite element analysis and experimental results in the literature. The modified cohesive shear-lag model provides a simple and effective method for analyzing fiber axial stress, shear stress in the fiber/matrix interface, and tensile elastic modulus of the final composite.
“…Experimental pullout curves 12,29 can be used as basis to construct a cohesive traction–separation function that describes the shear behavior of the cohesive interface, as shown in Figure 2. The cohesive traction–separation constitutive relation is expressed in equation (1).…”
Section: A Modified Slm With a Cohesive Fiber/matrix Interfacementioning
confidence: 99%
“… where K 0 is the initial shear stiffness of the cohesive fiber/matrix interface, δ is the tangential displacement of the cohesive fiber/matrix interface. Figure 2.Cohesive traction–separation model: (a) microdroplet pullout test, 29 (b) typical pullout force–displacement curve, 30 and (c) cohesive traction–separation constitutive relation.…”
Section: A Modified Slm With a Cohesive Fiber/matrix Interfacementioning
Section: A Modified Slm With a Cohesive Fiber/matrix Interfacementioning
confidence: 99%
“…28 No study of the stress distribution of short fiber–reinforced composite systems using SLM with consideration of the cohesive behaviors of fiber/matrix interface has been identified, except for the work on fiber pullout from single fiber composites by Chen and Yan. 24 In this work, we used the experimental load–displacement curves microdroplet tests 12,29 to construct cohesion behaviors of the natural fiber/matrix interface and establish a modified SLM to analyze the elastic properties of the SNFRCs. Using this modified SLM, we investigated the effects of cohesive interfacial shear stiffness, elastic properties of the fiber and the matrix, fiber aspect ratio, and average fiber axial stress at the embedded end face of fiber on the stress–transfer characteristics and axial tensile properties of the composite.…”
Natural fiber-reinforced composites are increasingly being used in the industry. The fiber–matrix interfacial properties of the composites are influenced by many factors, including chemical treatment of the natural fiber, type of polymer matrix, composites fabrication method, and process and the service environment of the composites. In this paper, a modified shear-lag model based on a cohesive fiber/matrix interface is proposed and applied to the analysis of the stress–transfer characteristics and the tensile properties of unidirectional short flax fiber-reinforced composites. The model takes into account of the interfacial shear stiffness, bonding strength between fiber end face and matrix, fiber aspect ratio and fiber volume fraction. 3D finite element models of the composites using a cohesive zone method are used to verify the accuracy of the modified shear-lag model. The fiber tensile strength and the composite tensile elastic modulus are significantly influenced by the interfacial shear stiffness, fiber aspect ratio, and fiber volume fraction. The bonding strength between the fiber end face and the matrix only has an effect when the interfacial shear stiffness is low. The predicted results from the modified shear-lag model show good agreement with the finite element analysis and experimental results in the literature. The modified cohesive shear-lag model provides a simple and effective method for analyzing fiber axial stress, shear stress in the fiber/matrix interface, and tensile elastic modulus of the final composite.
“…The specific parameters of the theoretical model are listed in Table 4 . It should be pointed out that according to previous research [13], 3% is determined as the volume fraction of voids for all specimens in this research.…”
In this study, a theoretical model based on the fiber buckling theory was established to predict the compression strength of a new type of syntactic foam, namely the syntactic foam reinforced by the warp-knitted spacer fabric (SF-WKSF). In order to verify the availability of this model, compression strength values of theoretical simulations were compared with the experiment results. The comparison results showed that the model can accurately simulate the compression strength values of different SF-WKSF samples with slight deviation. Finally, the causes of deviation was analyzed in detail.
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