Abstract:In the fiber-reinforced resin matrix composites, the “interphase” is an important component. And the “cohesive element” is usually used to characterize the mechanical properties of “interphase” in numerical models based on the general finite element software ABAQUS. But the corresponding parameters of it are difficult to be determined. So the single-carbon fiber-reinforced resin matrix composites are used as the main research object and the method combining resistance experiment and numerical analysis is adopt… Show more
“…The curing process of the different resin can be referred to in Liu et al. 5 Figure 2.Concave paper card.Figure 3.The resin micro-droplets under the reflected light.…”
Section: Methodsmentioning
confidence: 99%
“…And the parameters K nn , K ss , and K tt can be referred to in Liu et al. 5 Figure 8.The bilinear constitutive model of “cohesive element” based on traction-separation.…”
Section: Numerical Simulationmentioning
confidence: 99%
“…3,4 But the corresponding parameters, including the elastic parameters and the strength parameters of this kind of element, are difficult to be determined. 5…”
In this study, the micro-droplet debonding test for three kinds of different single fiber composites (CCF/epoxy resin-128, CCF/epoxy resin-5228, and CCF/ bismaleimide resin-5428) is carried out. Then the corresponding numerical model for the test is established in the general finite element software ABAQUS and the process of the elastic load transferring in the test is simulated. Based on the numerical results, the reasonable critical debonding load “F” in the test is analyzed and is extracted from the scattered experimental datum. And it is used to combine with the numerical simulation for the “interphase” debonding process in the test. So the strength parameters of the “cohesive element” in the numerical are analyzed and determined. It turned out that in the numerical model for the CCF/Bismaleimide5428 single fiber composite, the strength parameter of the “cohesive element” is much higher (they are 130 MPa). It is demonstrated that the strength of the “interphase” in this single fiber composite is much stronger than that in the other two single fiber composites. These parameters can also be used to characterize the properties of “interphase” in composites.
“…The curing process of the different resin can be referred to in Liu et al. 5 Figure 2.Concave paper card.Figure 3.The resin micro-droplets under the reflected light.…”
Section: Methodsmentioning
confidence: 99%
“…And the parameters K nn , K ss , and K tt can be referred to in Liu et al. 5 Figure 8.The bilinear constitutive model of “cohesive element” based on traction-separation.…”
Section: Numerical Simulationmentioning
confidence: 99%
“…3,4 But the corresponding parameters, including the elastic parameters and the strength parameters of this kind of element, are difficult to be determined. 5…”
In this study, the micro-droplet debonding test for three kinds of different single fiber composites (CCF/epoxy resin-128, CCF/epoxy resin-5228, and CCF/ bismaleimide resin-5428) is carried out. Then the corresponding numerical model for the test is established in the general finite element software ABAQUS and the process of the elastic load transferring in the test is simulated. Based on the numerical results, the reasonable critical debonding load “F” in the test is analyzed and is extracted from the scattered experimental datum. And it is used to combine with the numerical simulation for the “interphase” debonding process in the test. So the strength parameters of the “cohesive element” in the numerical are analyzed and determined. It turned out that in the numerical model for the CCF/Bismaleimide5428 single fiber composite, the strength parameter of the “cohesive element” is much higher (they are 130 MPa). It is demonstrated that the strength of the “interphase” in this single fiber composite is much stronger than that in the other two single fiber composites. These parameters can also be used to characterize the properties of “interphase” in composites.
“…They evaluated the interfacial shear strength and ultimate strength of SMA hybrid composites, using pull-out and uniaxial tensile tests. Liu et al (2012) and Wang et al (2015) obtained the parameters required for the cohesive zone for the three different resin types, using the microdroplet debonding test and numerical simulation. Dawood et al (2015) presented the parameters of the cohesive zone, using the pull-out test of SMA wires from carbon/epoxy matrix materials.…”
Shape memory effect of NiTi wires is utilized to design various smart composite structures. In these systems, smart wires can induce strains in the host structure by their inherent shape memory effect and phase transformation at elevated temperatures. This article presents an experimental and numerical study on the actuation capability of shape memory alloy wires embedded in the carbon/epoxy composite. In the experimental part, hybrid shape memory alloy/carbon/epoxy composite specimens are fabricated and examined to measure induced strains in the host structure by the phase transformation of the shape memory alloy wires. Hybrid composite specimens were clamped at one end, and the shape memory alloy wires were activated using electrical resistive heating. Numerical simulations were carried out using ABAQUS software to simulate the actual thermomechanical behavior of the hybrid composite specimens. A three-dimensional finite element model based on cohesive zone modeling is used to predict interfacial debonding in hybrid composite plates. The results of the parametric study suggest that by increasing Young’s modulus of the host composites, the amount of the induced strain decreases rapidly. However, for Young’s moduli more than 20 GPa, the induced strain will stay almost constant. Moreover, it was confirmed that increasing the shape memory alloy pre-strain without controlling the actuation temperature may result in the reduction of induced strain in the host composites.
“…It is maximum at the two ends of the fiber fragmentation and decreases to zero at middle. 14 With the increasing load, the different damage model, such as the interface debonding or the matrix yielding will appear at the ends of the fiber fragmentation depending on the properties of the matrix and the ''interphase'' in single fiber composite. 15 When the interfacial shear strength is less than the yielding strength of the matrix, it means that the poor adhesion exists between the fiber and the matrix in single fiber composite.…”
In this study, the shear-lag model considering the micro-structure “interphase” and the two separate micro-damages, “interphase” debonding and matrix damage, in single fiber composite is developed firstly. So the more actual stress distribution on the fiber fragmentations during the process of stress transferring in single fiber composite is obtained. Then based on the present shear-lag model, the Monte-Carlo simulation for the process of the single-fiber fragmentation is established to predict the number of fiber fragmentation during the process of the test. The predicted result of the simulation is in accordance with the result of the single-fiber fragmentation test. At last, the factors including the statistical parameter of fiber strength distribution, the properties of the matrix and the state of the “interphase” in the single fiber composite, which affect the process of single-fiber fragmentation are analyzed.
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