Numerical Simulation of High Strain Rate and Temperature Properties of Laser Powder Bed Fusion Ti6Al4V(ELI) Determined Using a Split Hopkinson Pressure Bar

Muiruri, Amos; Maringa, Maina; Preez, Willie du

doi:10.3390/ma15051872

Cited by 8 publications

(3 citation statements)

References 59 publications

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“…The experimental devices include a high-pressure gas gun, a sleeve striker, an incident bar with an end cap, a transmission bar, and a measuring signal acquisition device, as shown in Figure 3. The engineering stress σ e and engineering strain ε e in the sample can be calculated from the reflected and transmitted strain wave signals collected by the strain gauge [24]. The engineering stress σ e and engineering strain ε e in the sample can be calculated from the reflected and transmitted strain wave signals collected by the strain gauge [24].…”

Section: Uniaxial Tensile Testsmentioning

confidence: 99%

“…The engineering stress σ e and engineering strain ε e in the sample can be calculated from the reflected and transmitted strain wave signals collected by the strain gauge [24]. The engineering stress σ e and engineering strain ε e in the sample can be calculated from the reflected and transmitted strain wave signals collected by the strain gauge [24].…”

Section: Uniaxial Tensile Testsmentioning

confidence: 99%

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Study on the Flow Behavior of 5052 Aluminum Alloy over a Wide Strain-Rate Range with a Constitutive Model Based on the Arrhenius Model Extension

Ma,

Wang,

Huang

et al. 2023

Metals

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The formability at room temperature and low speed limits the application of aluminum alloy, while high strain rates positively improve the formability of materials. The constitutive behaviors of materials under high strain rates or impact loadings are significantly different from those under quasi-static conditions, while few constitutive models consider the effect of the mobile dislocation and forest dislocation evolution on the dynamic strain aging (DSA) over a wide strain-rate range. The 5052 aluminum alloy, of which the primary source of strain-hardening is dislocation–dislocation interaction, is widely used in manufacturing automotive covering parts and is considered one of the most promising alloys. Therefore, this study conducts uniaxial tensile tests on AA5052-O under conditions of temperatures ranging from 293 K to 473 K and strain rates ranging from 0.001 s−1 to 3000 s−1, and compares the stress–strain relationships of AA5052-O under different conditions to illustrate the constitutive relationship affected by the dislocation evolution over a wide strain-rate range. The Arrhenius model based on the thermal activation mechanism is modified and extended by considering the effects of dynamic strain aging (DSA), drag stress, and the evolution of mobile dislocation and forest dislocation. Thus, a new physics-based constitutive model for AA5052-O is proposed, which can well reflect the change in strain-rate sensitivity with the strain rate increasing. The mobile dislocation density and total dislocation density are predicted with a modified Kubin–Estrin (KE) model, and the influences of variable mobile dislocation on DSA and dislocation drag are discussed as well. In order to verify the reliability of the new constitutive model, the dislocation densities of the specimens before and after deformation are obtained with TEM and XRD, which are in good agreement with the predicted values. This study also compares the newly proposed model with classic constitutive models using multiple statistical evaluation methods, which shows that the new physics-based constitutive model has not only more clear physical meanings for its parameters but also has a higher prediction accuracy.

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Section: Uniaxial Tensile Testsmentioning

confidence: 99%

Section: Uniaxial Tensile Testsmentioning

confidence: 99%

Study on the Flow Behavior of 5052 Aluminum Alloy over a Wide Strain-Rate Range with a Constitutive Model Based on the Arrhenius Model Extension

Ma,

Wang,

Huang

et al. 2023

Metals

View full text Add to dashboard Cite

show abstract

“…Hopkinson Pressure Bars (S/HPB) [87,[94][95][96][119][120][121], or ballistic pendulums [117,122]. The cost for such equipment, particularly S/HPBs, can quickly become prohibitive in nature, perhaps suggesting one reason for the majority of literature focusing instead on more accessible testing [123,124]. Additionally, S/HPB generally require a large footprint, which may not be possible for all labs to accommodate, and while some smaller devices do exist, such as the desktop Kolsky bar, those smaller devices would also limit the maximum specimen dimensions [125].…”

Section: Testing Speedmentioning

confidence: 99%

Multiscale Impact Mechanics of Additively Manufactured Periodic Cellular Solids

Bernard

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Cellular materials are well known to have superior weight-specific properties, including Energy Absorption (EA) capabilities, as compared to solid, monolithic materials. Regular periodic lattice materials, which are a subset of cellular materials, are I would like to begin by thanking my supervisor Dr. Mostafa El Sayed, without whom I would have been unable to see this work through to completion. His persistent push to challenge me helped me grow academically and I truly appreciate all of his guidance and encouragement throughout the entire thesis process, which can be rather tense during the best of times but was a unique process to start, continue, and end during a pandemic, which was an ever-present looming shadow.I would also like to acknowledge the guidance of Dr. Muhammet Yalcin, with whom I had the pleasure of working with in 2022 and with whom I am looking forward to finishing the publication of a few additional papers from our work together.I would also like to sincerely thank BOMBARDIER Aerospace, Montreal, together with MITACS, Canada, for their financial support of this research.Additionally, thank you to my peers: Padmassun for his quick and detailed Python and regex help; and Ariane for her Ansys SpaceClaim guidance, supportive words, and the helpful encouragement to simply write a bit of code to do my repetitive tasks automatically.Thank you to my family -mom, dad, and Kael -for their continual support throughout this seemingly unending academic journey. I also owe a great deal of thanks to my close friends -A, S, K, and B -for all of the ways in which they supported me along this perilous road: countless phone and video chats; brunches, bubble tea excursions, dinners, and long walks to help me get out of my apartment; watching cringe TV shows and sharing in my learning of crochet as stress-relievers; passing along their vi ramen recipes that I can't believe I've missed out on for so long; and for simply sticking around.I would also like to thank my therapist -who knows who she is -for her constant support.And lastly, the following events go fully unacknowledged, for they did not positively contribute to my physical nor mental health, cannot be said to have aided any forward progress of this thesis whatsoever and, without them, I surely would have finished sooner: the COVID-19 pandemic and contracting COVID-19; and the passing of my childhood puppy. vii

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A Method for Dynamic Kolsky Bar Compression at High Temperatures: Application to Ti-6Al-4V

Pittman,

Clarke,

Lamberson

2024

Exp Tech

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An experimental apparatus for measuring the dynamic behavior of materials subjected to strain rates on the order of 10$$^3$$ 3 s$$^{-1}$$ - 1 and temperatures up to 800°C with a unique triple actuation system is developed in this work. This system is based on the traditional Kolsky (or split-Hopkinson pressure) bar design, with the addition of an external furnace used to heat the specimen to the desired temperature. A synchronized triple pneumatic actuation system is used to control the motion and timing of the the sample, incident, and transmitted bars. The cold contact time (CCT), or the time during which the heated sample is in contact with the room temperature bars before compression, is measured experimentally and carefully controlled to minimize the development of a temperature gradient across the sample and avoid heating of the bars. Experiments are performed in conjunction with ultra high speed imaging and 2D digital image correlation (DIC), as well as high speed thermal imaging. To verify the viability of the proposed system, experiments were conducted on Ti-6Al-4V (wt.%) at temperatures from 25°C up to and 800°C at an average strain rate of approximately 1200 s$$^{-1}$$ - 1 .

show abstract

Numerical Simulation of High Strain Rate and Temperature Properties of Laser Powder Bed Fusion Ti6Al4V(ELI) Determined Using a Split Hopkinson Pressure Bar

Cited by 8 publications

References 59 publications

Study on the Flow Behavior of 5052 Aluminum Alloy over a Wide Strain-Rate Range with a Constitutive Model Based on the Arrhenius Model Extension

Study on the Flow Behavior of 5052 Aluminum Alloy over a Wide Strain-Rate Range with a Constitutive Model Based on the Arrhenius Model Extension

Multiscale Impact Mechanics of Additively Manufactured Periodic Cellular Solids

A Method for Dynamic Kolsky Bar Compression at High Temperatures: Application to Ti-6Al-4V

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