Experimental and Numerical Research on Open-Hole Strength and Damage Mechanism of Regularly Arrayed Short Fiber Reinforced Polymer Composite

Hu, Junfeng; Zhang, Xutong; Chen, Zhou; Guo, Wenkang; Li, Hang; Deng, Xi

doi:10.3390/polym12071622

Cited by 7 publications

(5 citation statements)

References 17 publications

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“…The model of the laminate was cut and given different material properties, as seen in Figure 3 . The material of the slits in the model was defined as resin, and the other parts were defined as received CFRP prepreg [ 32 ]. All freedoms along the periphery of the plate were constrained to zero to simulate the experimental clamped conditions, and all freedoms of the indenter except the z-axis were constrained to zero to simulate the drop-weight low-velocity impact.…”

Section: Finite Element Modelingmentioning

confidence: 99%

Research on Low-Velocity Impact Response of Novel Short-Fiber-Reinforced Composite Laminates

Huang

EShun

et al. 2023

Polymers

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Short-fiber-reinforced polymers (SFRPs) based on unidirectionally arrayed chopped strands (UACSs) have excellent formability and outstanding mechanical response. The low-velocity impact response, such as the delamination, damage tolerance and energy absorption of UACS composites, are essential to guarantee the stability and safety of composite components in service. The current study investigates the low-velocity impact response of continuous carbon-fiber-reinforced polymer (CFRP) and UACS laminates with vertical slits under drop-weight impact with various impact energies (4, 7 and 11 J). The in-plane size of the studied samples is 100 mm × 100 mm, and the stacking sequence is [0/90]4s. The time–history curves of load and energy are examined during low-velocity impact experiments, as well as the nonvisible damages are obtained by ultrasound C-scan imaging technique. A user-defined subroutine VUMAT, including the Johnson–Cook material and failure model, which is used to simulate the elastic–plastic property of the slits filled with resin, is coded in ABAQUS/Explicit. According to C-scan inspections of the impact-damaged laminates, UACS specimens show more severe delamination as impact energy increases. The damaged area of continuous CFRP laminates under impact energy of 11 J is 311 mm2, while that of UACS laminates is 1230 mm2. The slits have a negative effect on the load-bearing capacity but increase the energy absorption of UACS laminates by approximately 80% compared to the continuous CFRP laminates at 7 J. According to the variables of different damage modes in numerical simulation, cracks appear at the slits and then expand along the direction perpendicular to the slits, leading to the fracture of fiber. Nevertheless, as the damage expands to the slits, the delamination confines the damage propagation. The existence of slits could guide the path of damage propagation.

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Section: Finite Element Modelingmentioning

confidence: 99%

Research on Low-Velocity Impact Response of Novel Short-Fiber-Reinforced Composite Laminates

Huang

EShun

et al. 2023

Polymers

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“…When the notch size increased from 0 to 18 mm, the tensile strength showed 69% reduction. Hu et al 10 found that the notched composite strength is 60% of the unnotched composite. The stiffness of composite was found to be decreasing with increasing the hole size.…”

Section: Introductionmentioning

confidence: 99%

Flexural performance of three-dimensional braided open-hole composite with different hole diameter and preform size

Gao

Wen

Siddique

et al. 2022

Journal of Industrial Textiles

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Three dimensional (3-D) braided composite is one element of the structures which must connect with other structural elements, to form load transmission path during its service in aerospace, transport and engineering structures. Bolted joints are usually the lower-cost option because of its simplicity, low-cost tooling, and inspection requirements. Secondary bending induced by minor eccentricity of the loads occurs in many types of joints and can cause serious problems. In this study, flexural performance of 3-D braided open-hole composite (3DBOHC) considering open-hole diameter and preform size is systematically studied. Three-point bending test combined with a high-speed camera observation was conducted. The results show that the damage initiates in the top surface of 3DBOHC. Failure mode gradually changed from fiber breakage into interface debonding, when increasing the braiding angle. The reduction of composite strength becomes less sensitive to drilling process when braiding angle increased. The strength reduction of 3DBOHC with hole diameter of 1.5 is 13.8%, 10.3% and 5.8% for 10°, 20° and 30°, respectively. The increase in modulus and strength achieved by increasing preform size is higher for larger braiding angle 3DBOHCs. When the preform size increased from 3 ⅹ 9 to 3 ⅹ 17, the modulus increase for 10°20°and 30° 3DBOHCs is 25.4%, 42.5% and 43.2%, respectively. The strength increase for 10°20°and 30°3DBOHCs is 20.3%, 26.3% and 30.2%, respectively. This research provides a comprehensive insight for the design and application of 3-D braided composite joints.

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“…In addition, multi-scale modeling and simulation for characterizing the material mechanical behavior have been utilized [ 8 , 35 , 36 , 37 ]. As mentioned earlier, in the cases of composites, since consideration of anisotropy greatly affects the accurate prediction of mechanical properties, attempts to numerically model the fiber orientation through experiments and simulation have been made steadily [ 38 , 39 , 40 , 41 , 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

Fiber Orientation and Strain Rate-Dependent Tensile and Compressive Behavior of Injection Molded Polyamide-6 Reinforced with 20% Short Carbon Fiber

Lee

Kim

2023

Polymers

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As the interest in short-fiber reinforced polymer (SFRP) composites manufactured by injection molding increases, predicting the failure of SFRP structures becomes important. This study aims to systemize the prediction of failure of SFRP through mechanical property evaluation considering the anisotropy and strain rate dependency. To characterize the mechanical properties of polyamide-6 reinforced with carbon fiber of a weight fraction of 20% (PA6-20CF), tensile and compressive experiments were conducted with different load-applying directions and strain rates. Additionally, the results were discussed in detail by SEM image analysis of the fracture faces of the specimen. FE simulations based on the experimental condition were constructed, and the numerical model coefficients were derived through comparison with experimental results. The coefficients obtained were verified by bending tests of the specimens manufactured from composite cross members fabricated by injection molding. Predicting under static and high strain rate conditions, small errors of about 9.6% and 9.3% were shown, respectively. As a result, it proves that explained procedures allow for better failure prediction and for contribution to the systematization of structural design.

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Experimental and Numerical Research on Open-Hole Strength and Damage Mechanism of Regularly Arrayed Short Fiber Reinforced Polymer Composite

Cited by 7 publications

References 17 publications

Research on Low-Velocity Impact Response of Novel Short-Fiber-Reinforced Composite Laminates

Research on Low-Velocity Impact Response of Novel Short-Fiber-Reinforced Composite Laminates

Flexural performance of three-dimensional braided open-hole composite with different hole diameter and preform size

Fiber Orientation and Strain Rate-Dependent Tensile and Compressive Behavior of Injection Molded Polyamide-6 Reinforced with 20% Short Carbon Fiber

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