Flexural Fatigue in a Polymer Matrix Composite Material Reinforced with Continuous Kevlar Fibers Fabricated by Additive Manufacturing

Pertúz-Comas, Alberto David; Díaz, John Faber Archila; Meneses-Duran, Oscar Javier; Niño-Álvarez, Nixon Yesid; León-Becerra, Juan

doi:10.3390/polym14173586

Cited by 23 publications

(9 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the mechanical properties are also dependent on the internal structure of the sample, e.g., porosity or inner defects [ 36 , 37 ]. It is well known that parts obtained by additive manufacturing are characterized by the occurrence of internal porosity [ 38 , 39 , 40 , 41 , 42 ]. In a previous work by the authors [ 40 ], the inner morphology of 3D-printed dogbones fabricated using PA12 was examined, revealing a significant level of porosity at approximately 3%.…”

Section: Resultsmentioning

confidence: 99%

Effect of Strain Rates and Heat Exposure on Polyamide (PA12) Processed via Selective Laser Sintering

2023

View full text Add to dashboard Cite

The use of polymers in the transportation industry represents a great opportunity to meet the growing demand for lightweight structures and to reduce polluting emissions. In this context, additive manufacturing represents a very effective fabrication route for mechanical components with sophisticated geometry that cannot be pursued by conventional methods. However, understanding the mechanical properties of 3D-printed polymers plays a crucial role in the performance and durability of polymer-based products. Polyamide is a commonly used material in 3D printing because of its excellent mechanical properties. However, the layer-by-layer deposition process and ensuing auxiliary steps (e.g., post-processing heating) may affect the microstructure and mechanical properties of 3D-printed nylon with respect to the bulk counterpart. In this work, we explore the effect of displacement rate and heat exposure on the mechanical properties of 3D-printed polyamide (PA12) specimens obtained by selective laser sintering (SLS). Moreover, the thermal characteristics of the powders and sintered material were evaluated using differential scanning calorimetry (DSC). Our results highlight the expected rate dependency of mechanical properties and show that a post-processing heat treatment partly affects mechanical behavior.

show abstract

Section: Resultsmentioning

confidence: 99%

Effect of Strain Rates and Heat Exposure on Polyamide (PA12) Processed via Selective Laser Sintering

2023

View full text Add to dashboard Cite

show abstract

“…AM-printed parts via PolyJet printing have the potential to eliminate challenges in conventional manufacturing and form a newer class of digital polymeric materials [10][11][12][13]. However, relatively little research is being done currently to understand the fatigue and fracture behavior of these materials, and the structural performance of these materials is not fully understood.…”

Section: Volume 3 Issue 1|2023| 31mentioning

confidence: 99%

Stiffness Degradation of PolyJet Printed Nano Embedded Configuration with Digital Material

Tomar

Ulu²,

Mohan³

et al. 2023

Digital Manufacturing Technology

View full text Add to dashboard Cite

Introduction: Polymer-based additive manufacturing (AM) parts are used in a variety of engineering applications in the automotive, aerospace, and energy industries. However, AM printed parts are a new class of materials and the structural performance of these materials is not yet fully understood, and research on the exact performance of PolyJet printed parts and related digital materials under fatigue loading is still minimal. The present study provides insight into the fatigue damage state, cyclic performance, and comparison between pristine (baseline) and Carbon Nano Fibers (CNFs) modified embedded test coupons formed using tailored digital designs and printed with digital polypropylene from PolyJet printing. Methods: The investigations employed 3-dimensional (3D) test coupons formed using PolyJet printing. The nanomodified coupons were formed using digital design configurations for tailored deposition locations that allowed the integration in a 2-step process. The limitations of the conventional ASTM D638 2-dimensional (2D) test coupon for AM-treated materials caused by the process are eliminated by the homogeneous 3D test coupon used in this work. An analytical model of the accumulated damage state based on stiffness deterioration under cyclic loading is presented along with an empirical model of effective elastic modulus based on the analysis of fatigue data. Additionally, the predicted model and the actual damage accumulation due to cyclic loading are compared. Results: With a high correlation coefficient, R2 of 0.9971 for the baseline and 0.9885 for the CNFs embedded configuration, it is observed that the linear function model can estimate fatigue life with an agreement to experimental results and can be used to extrapolate for other stress levels. CNFs modified resin embedded configuration showed lower fatigue life as compared to baseline. This reduction can be attributed to the stress concentration at the interfaces. Conclusion: This work fills the gap in the literature by characterizing the fatigue life, and cyclic performance of PolyJet printed parts and nano-modified systems with digital material.

show abstract

“…It is documented that polymers are time-dependent materials [4] they soften under variable loads [18]. According to a literature search [22,26] failure in polymer under fatigue loading can be described when the load fails below 85% of the initial load. The stress-life curve is shown in Fig.…”

Section: Fatigue Tests On Notched Onyxmentioning

confidence: 99%

“…A schematic of such gaps is shown in Fig. 1a for the material deposited in the Z direction and a SEM photograph of the actual gaps [22]. Such gaps might behave as stress concentration sites on which the material may respond differently to static and alternative loads.…”

Section: Introductionmentioning

confidence: 99%

Notch Sensitivity Study in U-notched Polymers Built by Additive Manufacturing (AM)

Diaz Rodriguez,

Pertuz Comas,

Sandoval Herrera

2023

Frattura Ed Integrità Strutturale

View full text Add to dashboard Cite

Onyx ® is a new material composed of Polyamide 6 reinforced with short carbon fiber, used in the novel additive manufacturing composites technique. This paper aims to present the axial fatigue performance of this material with and without U-notches. The experimentally determined S-N fatigue curve was obtained under axial load with a load inversion ratio, R = 0.1, and compared to fatigue performance of U-notched samples ranging from 0.25 to 2 mm radius. In addition, the stress concentration factor was compared for static and alternative loading to obtain the notch sensitivity in terms of the U-notch radius, showing that there is indeed a difference in stress concentration between them. The advantage of the approach is that it permits using commonly used dimensioning methods for this AM material.

show abstract

Flexural Fatigue in a Polymer Matrix Composite Material Reinforced with Continuous Kevlar Fibers Fabricated by Additive Manufacturing

Cited by 23 publications

References 37 publications

Effect of Strain Rates and Heat Exposure on Polyamide (PA12) Processed via Selective Laser Sintering

Effect of Strain Rates and Heat Exposure on Polyamide (PA12) Processed via Selective Laser Sintering

Stiffness Degradation of PolyJet Printed Nano Embedded Configuration with Digital Material

Notch Sensitivity Study in U-notched Polymers Built by Additive Manufacturing (AM)

Contact Info

Product

Resources

About