Investigation into tensile behavior of 3D printed nylon-based low and high-volume fraction carbon fiber composite

Mishra, Pradeep Kumar; Jagadesh, T.

doi:10.1108/rpj-06-2022-0204

Cited by 3 publications

(1 citation statement)

References 84 publications

(141 reference statements)

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“…When examining these values, the difference in tensile strength is only 0.24% to 1.24%. In the case of specimens that failed near the tab, cracks started near the tab due to stress concentration, and the final fracture occurred as the crack propagated as the tensile load was applied [39,40]. Figure 10 shows the relationship between the tensile strength and saltwater absorption rate, which was different among the specimen types.…”

Section: Relationship Between the Saltwater Absorption Rate And Tensi...mentioning

confidence: 99%

Role of the Wall Layer in 3D-Printed Composites under the Salt Spray Condition

Kim

Seo

2023

JMSE

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While the mechanical strength of 3D-printed composites is an area of active research, few studies have considered their application to the marine industry. In particular, the role of wall layers is an issue because of their lack of the contribution to the mechanical strength although they help prevent water penetration. In this study, experiments were performed to investigate the effects of salt spray exposure on the mechanical strength of continuous fiber 3D-printed composites with and without the wall layer. Specimens were printed using continuous fiber filaments in the same direction as the loading direction with and without a wall layer. The period of salt spray exposure was set to 15 and 30 days, and the saltwater absorption rate was calculated for each specimen. Tensile tests were performed to determine the effect of the exposure period on the tensile modulus and strength. The results showed that the tensile strength decreased with an increasing exposure period and that the presence of the wall layer reduced the rate of decrease in the mechanical strength. The results confirmed that a wall layer prevents the penetration of saltwater, which may facilitate the potential application of 3D-printed composites in the marine industry.

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Section: Relationship Between the Saltwater Absorption Rate And Tensi...mentioning

confidence: 99%

Role of the Wall Layer in 3D-Printed Composites under the Salt Spray Condition

Kim

Seo

2023

JMSE

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Investigation of the effects of volume fraction, aspect ratio and type of fibres on the mechanical properties of short fibre reinforced 3D printed composite materials

Gonabadi,

Chen,

Bull

2024

Prog Addit Manuf

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Mechanical behaviour of 3D-printed composite parts is affected by the volume fraction, aspect ratio and type of fibre reinforcement. Although in the literature experimental approaches have been used to characterise the effects of the above factors on the mechanical properties of 3D printed parts, time and cost of the manufacturing process as well as the uncertainty associated with a large number of experimental techniques are the key issues. This study aims to address these challenges by developing a methodology based on a multi-scale Finite Element (FE) analysis of representative volume element (RVE) of 3D printed composite parts to predict the effective orthotropic properties. To account for the effects of fibre features, RVEs were modelled considering variables of volume fraction, aspect ratios and type of short fibres. To study the main and interaction effects of the above variables on the mechanical properties of 3D printed composite parts, a structured approach based on the Design of Experiments is used. The FE stress analysis of the RVE provides an understanding about the potential failure modes such as interfacial debonding between fibres and matrix, interlayer and intralayer delamination that may occur in load-bearing 3D printed composite parts. The FE computed mechanical properties are validated against experimental data through a series of mechanical testing of flexure, Iosipescu, and short beam shear which were conducted in conjunction with the Digital Image Correlation technique. As a result, certainty is obtained in using the proposed approach for a fast iterative design of 3D printed composite parts prior to industrial applications.

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Comparison study of Izod impact properties on 3D printed thermoplastic and thermoset carbon fiber composite at different infill density

Kumar Mishra,

2024

RPJ

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Purpose This study aims to evaluate the low energy impact characteristics of 3D printed carbon fiber thermoplastic and thermoset polymer composite using the Izod impact test. The effects of infill density are examined on the Izod impact properties of 3D printed thermoset polymer and thermoplastic composite specimens. Furthermore, a thorough investigation is conducted into the effect of heat treatment using a hot-air oven on both types of 3D printed composite specimens. To characterize the impact characteristics of each specimen, the fracture surfaces caused by impact load are inspected, and the fracture mechanism is studied using scanning electron micrographs. Design/methodology/approach Izod Impact specimens of thermoset (epoxy resin) and thermoplastic carbon fiber of different infill density (70, 75, 80, 85, 90 and 100%) are fabricated using the different fiber impregnation 3D printing process. To carry out the heat treatment process, printing of composites is done for each infill design from both thermoset and thermoplastic composites and the impact characteristics of specimens are evaluated on a pendulum test-rig using the ASTM D-256 standard. Using a scanning electron microscope, each fracture zone underwent four separate scanning processes, ranging in size from 2 µm to 100 µm. Findings The impact resistance of the 3D printed thermoset and thermoplastic composite material is significantly influenced by the type of fiber placement and infill density in the matrix substrate. Because of the weak interfacial strength between the layers of fiber and polyamide 6, the specimen printed with continuous fiber implanted at the part exhibited reduced impact resistance. At 75% infill density, the impact specimen printed with coextruded fiber showed the highest impact resistance with a 367.02% greater magnitude than the continuous fiber specimen with the same infill density. Originality/value This work presents a novel approach to analyze the low energy impact characteristics and three-dimensional printing of carbon fiber reinforced thermoplastic and carbon fiber reinforced thermoset and thermoplastic composite material.

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Investigation into tensile behavior of 3D printed nylon-based low and high-volume fraction carbon fiber composite

Cited by 3 publications

References 84 publications

Role of the Wall Layer in 3D-Printed Composites under the Salt Spray Condition

Role of the Wall Layer in 3D-Printed Composites under the Salt Spray Condition

Investigation of the effects of volume fraction, aspect ratio and type of fibres on the mechanical properties of short fibre reinforced 3D printed composite materials

Comparison study of Izod impact properties on 3D printed thermoplastic and thermoset carbon fiber composite at different infill density

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