Stress Relaxation and Creep of a Polymer-Aluminum Composite Produced through Selective Laser Sintering

Bochnia, Jerzy; Błasiak, Sławomir

doi:10.3390/polym12040830

Cited by 16 publications

(11 citation statements)

References 24 publications

(35 reference statements)

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“…The polymers and polymer composites having improved properties are in great demand due to their high strength and lightweight 1,2 . They can be used in several applications including automotives, aerospace, textiles, sports, and military.…”

Section: Introductionmentioning

confidence: 99%

Creep behavior of 3D printed polymer composites

Jayswal,

Liu,

Harris

et al. 2023

Polymer Engineering & Sci

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The creep behavior of polymer composites containing different weight percentages of poly(lactic) acid (PLA), thermoplastic polyurethane (TPU), and poly(ethylene) glycol (PEG) is experimentally characterized and computationally modeled using finite element analysis (FEA). The composite filaments are manufactured with melt extrusion method by using twin‐screw extruders, and then are employed in the 3D printing of creep samples. The samples are tested under a constant tensile load of 100 N. In this study, the computational model is developed by using the Generalized Voigt‐Kelvin solid model and three terms in Prony series. The equations of Prony series were obtained by the Laplace transformation of Kelvin model. The experimental creep displacements and strains are compared with computational results, and a good agreement between them is observed. The maximum error percentage in computational result is approximately 6% as compared to the experimental result. Hence, it can be said that the relatively simple computational models developed are reliable and can be used to study the creep behavior of similar polymers. The error percentages can still be reduced by considering a higher number of terms of Prony series in the model.Highlights Studied creep behavior for additively manufactured thermoplastic polymer composites. Developed computational model using three terms of relaxation modulus. The experimental results correlate very well with the computational model. Computational models can be used for other polymers.

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Section: Introductionmentioning

confidence: 99%

Creep behavior of 3D printed polymer composites

Jayswal,

Liu,

Harris

et al. 2023

Polymer Engineering & Sci

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“…In [8,9], Bochnia et al deal with the rheological properties of polymer specimens fabricated through SLS. The rheological data, i.e., stress relaxation and creep, predicted using the Maxwell-Wiechert and the Kelvin-Voigt models, respectively, were in agreement with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Geometry, Structure and Surface Quality of a Maraging Steel Milling Cutter Printed by Direct Metal Laser Melting

2022

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This article considers the use of additive manufacturing to produce cutting tools for various machining operations, especially turning, milling, and drilling. The right geometry and material of the tool as well as coatings applied on cutting edges are crucial as they improve the life and performance of the tool. The study described here focused on a four-flute end mill made of maraging steel 1.2709 using a Concept Laser M2 Cusing Direct Metal Laser Melting (DMLM) machine. Before the printed tool was first used, it was examined to determine its dimensional and geometric accuracy, surface roughness, and surface structure. The measurement data showed that the tool required machining, e.g., grinding, to improve its geometry because the total runout of the shank and the cutting edge radius were too high, amounting to 120 μm and 217 μm, respectively. The cutting edges were sharpened to obtain a fully functional cutting tool ready to perform milling operations. The study aimed to check the dimensional and geometric accuracy of the 3D printed milling cutter and determine the optimal machining allowance for its finishing.

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“…It can cause the relaxation of stress and irreversible deformation, thus leading to functional failures when the part is intended to maintain the required stress and shape [ 1 ]. Polymer-bonded composites materials (PBMs) are increasingly used in engineering components due to its high strength and lightweight [ 2 , 3 , 4 ]. For PBMs the creep can take place at a relatively low temperature [ 5 ]; therefore, a reliable prediction of the creep behavior is critical to ensure the safety and durability of PBMs under sustained loads.…”

Section: Introductionmentioning

confidence: 99%

A Phenomenological Primary–Secondary–Tertiary Creep Model for Polymer-Bonded Composite Materials

et al. 2021

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This study develops a unified phenomenological creep model for polymer-bonded composite materials, allowing for predicting the creep behavior in the three creep stages, namely the primary, the secondary, and the tertiary stages under sustained compressive stresses. Creep testing is performed using material specimens under several conditions with a temperature range of 20 °C–50 °C and a compressive stress range of 15 MPa–25 MPa. The testing data reveal that the strain rate–time response exhibits the transient, steady, and unstable stages under each of the testing conditions. A rational function-based creep rate equation is proposed to describe the full creep behavior under each of the testing conditions. By further correlating the resulting model parameters with temperature and stress and developing a Larson–Miller parameter-based rupture time prediction model, a unified phenomenological model is established. An independent validation dataset and third-party testing data are used to verify the effectiveness and accuracy of the proposed model. The performance of the proposed model is compared with that of an existing reference model. The verification and comparison results show that the model can describe all the three stages of the creep process, and the proposed model outperforms the reference model by yielding 28.5% smaller root mean squared errors on average.

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Stress Relaxation and Creep of a Polymer-Aluminum Composite Produced through Selective Laser Sintering

Cited by 16 publications

References 24 publications

Creep behavior of 3D printed polymer composites

Creep behavior of 3D printed polymer composites

Geometry, Structure and Surface Quality of a Maraging Steel Milling Cutter Printed by Direct Metal Laser Melting

A Phenomenological Primary–Secondary–Tertiary Creep Model for Polymer-Bonded Composite Materials

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