The effect of crack insertion for FDM printed PLA materials on Mode I and Mode II fracture toughness

Vălean, Cristina; Marșavina, Liviu; Marghitas, Mihai P.; Linul, Emanoil; Razavi, Javad; Berto, Filippo; Brighenti, Roberto

doi:10.1016/j.prostr.2020.11.128

Cited by 37 publications

(4 citation statements)

References 18 publications

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“…This value is within the range already considered in Ref. [42]. Adjustments were made so that the puncher bends upward and moves at a rate of 4 mm/min.…”

Section: Experimental Methodsmentioning

confidence: 64%

Experimental and numerical investigation on the crashworthiness performance of double hat‐section Al‐CFRP beam subjected to quasi‐static bending test

Bidadi,

Hampaiyan Miandowab,

Saeidi Googarchin

et al. 2024

Polymer Composites

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Nowadays, hybrid structures, which combine low‐density composites with low‐cost thin‐walled metals, have shown great effect in enhancing the performance of automotive body structures, especially the energy absorber components. This study focuses on the experimental and numerical investigation of the bending energy absorption behavior of CFRP/aluminum hybrid double hat‐section beams used in the side part of the car body. In the experimental section, two types of double hat‐section beams were fabricated: aluminum and Al/CFRP. These beams were then subjected to quasi‐static three‐point bending tests. The results demonstrated that the hybrid beam exhibited superior energy absorption capabilities compared to the single beam. Subsequently, a finite element model was developed using LS‐Dyna software and was validated by comparing the experimental and numerical load–displacement results. In‐depth numerical analyses were conducted to investigate the influence of various design parameters, including CFRP‐reinforcement configuration, numbers of CFRP layers, CFRP ply‐angle, CFRP reinforced length, and aluminum/CFRP mass, on crashworthiness indicators. The numerical findings indicate that the hybrid beam with , ply‐angles exhibited better crash force efficiency (CFE) and specific energy absorption (SEA) compared to other ply‐angles, respectively. Furthermore, increasing the number of CFRP layers within the total beam's mass improved its energy absorption capacity. It was also revealed that the CFRP length on the upper and lower hats could be considered as 42.5% of the total aluminum beam length, as opposed to the full CFRP length, providing enhanced energy absorption capabilities.Highlights Bending behavior of the Al and Al/CFRP double hat section beams. Effects of variable thickness and identical mass on the double hat section beam. Effects of variable ply angle and number of CFRP layers on the hybrid beams. Discrete effect of CFRP reinforcement configurations and inner CFRP lengths.

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“…This value is within the range already considered in Ref. [42]. Adjustments were made so that the puncher bends upward and moves at a rate of 4 mm/min.…”

Section: Experimental Methodsmentioning

confidence: 64%

Experimental and numerical investigation on the crashworthiness performance of double hat‐section Al‐CFRP beam subjected to quasi‐static bending test

Bidadi,

Hampaiyan Miandowab,

Saeidi Googarchin

et al. 2024

Polymer Composites

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“…The critical distance L = 4.6 mm estimated by Ahmed and Susmel 38 was also used to predict the fracture load of AM PLA single edge notch bend (SENB) specimens obtained via FDM. 47,48 A Prusa MK3 printer was used with the following printing parameters: nozzle diameter 0.4 mm, infill density 100%, nozzle temperature 220 C, bed temperature 60 C, raster angle +45 /À45 , build direction flat through the thickness, and layer thickness 0.15 mm. Three orientations were considered: 0 , 45 , and 90 .…”

Section: Notched 3d Printed Polymers: Infill Density Equal To 100%mentioning

confidence: 99%

The application of the Theory of Critical Distances to nonhomogeneous materials

Marșavina

Sapora

Susmel

et al. 2023

Fatigue Fract Eng Mat Struct

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The Theory of Critical Distances (TCD) has undoubtedly represented a breakthrough in the brittle failure assessment of engineering materials containing defects, crack, or notches. The basic idea on which the simplest formulation of the TCD is based is to evaluate an effective stress at a characteristic distance from the tip of the defect/crack/notch and compare it with an inherent fracture strength. Is the critical distance related to the material (micro) structure? Whereas a correlation was already proved for homogeneous materials, the current attention to nonhomogeneous ones has brought the question back to the fore. The goal of the present work is therefore twofold: (i) to extend the use of the TCD, through the simple yet effective Point Method (PM), for the static failure assessment of inhomogeneous materials, such as cellular, biological, and additively manufactured (AM) materials; and (ii) to look for a correlation between critical distance and internal (micro) structure.

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“…In the case of Zhu et al (2018Zhu et al ( , 2020, a comparative analysis of various 3D printing technologies was conducted through uniaxial compression tests, highlighting that specimens produced via SLA technology are adept at simulating hard rocks. Similarly, Vălean et al (2020), JIANG (Jiang and Zhao 2015;Jiang et al 2016a, b), and others harnessed FDM technology and polylactic acid (PLA) to create rock-like specimens exhibiting diverse crack features. Test outcomes revealed limitations in mechanical properties of specimens made with FDM technology and PLA material, hindering their direct simulation of natural rocks.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and mechanism of time on sand powder 3D printing rock analogue: a new method for fractured rock mechanics

Zhang,

Jiang,

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

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Laboratory tests are one of the most fundamental and crucial methods in rock mechanics and engineering research. Natural rock specimens are challenging to acquire, and traditional casting methods involve prolonged curing times and cannot produce rock-like specimens with complex internal fractures. Furthermore, 3D printing technologies such as SLA, SLS, and FDM possess inherent limitations. In this study, high-silica sand was used as the printing material, and sand powder 3D printing technology was harnessed to fabricate rock-like specimens. Uniaxial compression tests were performed on specimens with varying placement times, aimed at investigating the impact of placement time on the mechanical properties of sand 3D-printed rock-like specimens. Acoustic emission technology was used to explore the internal state changes during deformation and failure of specimens with different placement times. The findings indicate that the mechanical properties of sand powder 3DP rock-like specimens exhibited no deterioration over time after approximately 7 days of placement. The internal structure remained unchanged across different placement times. This study's outcomes underscore the superiority of sand powder 3D printing technology within the realm of rock mechanics and establish the groundwork for the accurate and efficient fabrication of rock-like specimens through sand powder 3D printing technology in the future.

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The effect of crack insertion for FDM printed PLA materials on Mode I and Mode II fracture toughness

Cited by 37 publications

References 18 publications

Experimental and numerical investigation on the crashworthiness performance of double hat‐section Al‐CFRP beam subjected to quasi‐static bending test

Experimental and numerical investigation on the crashworthiness performance of double hat‐section Al‐CFRP beam subjected to quasi‐static bending test

The application of the Theory of Critical Distances to nonhomogeneous materials

Characteristics and mechanism of time on sand powder 3D printing rock analogue: a new method for fractured rock mechanics

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