Optimized Filling of a Given Cuboid with Spherical Powders for Additive Manufacturing

The equiatomic CoCrFeNiMn high-entropy alloy (HEA) possesses excellent properties including exceptional strength–ductility synergy, high corrosion resistance, and good thermal stability. Selective laser melting (SLM) additive manufacturing facilitates the convenient fabrication of the CoCrFeNiMn HEA parts with complex geometries. Here, the SLM process optimization was conducted to achieve a high relative density of as-built CoCrFeNiMn HEA bulks. The mechanisms of process-induced defects and process control were elucidated. The microscale mechanical behaviors were analyzed through in situ scanning electron microscopy observation during the compression tests on micro-pillars of the as-built HEA. The stress–strain characteristics by repeated slip and mechanism of “dislocation avalanche” during the compression of micro-pillars were discussed. The high-cycle fatigue tests of the as-built HEA were performed. It was found that a large number of nano-twins were induced by the fatigue, causing a non-negligible cycle softening phenomenon. The effects of promoted ductility due to the fatigue-induced nano-twins were illustrated. This work has some significance for the engineering application of the SLM additively manufactured CoCrFeNiMn HEA parts.

show abstract

“…In addition, the particle size and the shape of powders are critical in reducing the number of defects in built-up layers [ 46 , 47 ].…”

Section: Resultsmentioning

confidence: 99%

Selective Laser Melting (SLM) Additively Manufactured CoCrFeNiMn High-Entropy Alloy: Process Optimization, Microscale Mechanical Mechanism, and High-Cycle Fatigue Behavior

Zhang

Yan

2022

Materials

View full text Add to dashboard Cite

show abstract

“…Selective Laser Melting (SLM) is one of the modern technologies of additive manufacturing, which is used for the manufacture of products of complex shape and structure from powder materials (Lesyk, Martinez, Mordyuk, Dzhemelinskyi, & https://www.hst-journal.com Історія науки і техніки, 2023, том 13, випуск 2 History of science and technology, 2023, vol. 13, issue 2 Lamikiz, A., 2019Lesyk, Martinez, Dzhemelinkyi, & Lamikiz, 2020;Duriagina et al, 2021). This process consists in successive layer-by-layer melting of metal powder material with the help of powerful laser radiation.…”

Section: Development Of Individual Additive Manufacturing Technologiesmentioning

confidence: 99%

Developmental review of metal additive manufacturing processes

Sokolovskyi,

Bernatskyi

2023

Hist. sci. technol.

View full text Add to dashboard Cite

This work is devoted to the study of the progress in various areas of additive manufacturing technology usage - from the first theories of layer-by-layer manufacturing to modern additive manufacturing technologies. Additive manufacturing technologies are some of the most rapidly developing sectors of manufacturing, maintaining significant interest of the scientific community due to the their represent of both an alternative manufacturing method for existing structures, as well as opening up opportunities for the development of new structures with structural complexity unattainable for traditional technologies. During historical review of the development and implementation of various technological processes in additive manufacturing for metals, a gap in compiling a comprehensive picture of the general development of additive manufacturing technologies in metallurgy was discovered. For a better understanding and systematization of knowledge about additive manufacturing, on top of answering a number of common questions about these technologies, an analysis of publicly known knowledge about their historical applications in the leading countries of the world was conducted. A number of additive manufacturing technologies were considered, such as Wire-Arc Additive Manufacturing, Selective Laser Sintering, Selective Laser Melting, Electron Beam Melting, and Laser-Engineered Net Shaping. The study focused on the developments carried out by various countries of the world in the 20th and 21st centuries by scientists from such countries as the USA, the United Kingdom, France, Germany, Japan, Canada, the USSR and others. The main documents for the initial research efforts for each family of additive manufacturing processes and various applications of these technologies - from topography and stereolithography to modern medicine with the aerospace industry ‒ were reviewed; their main findings, breakthroughs and challenges were discussed. An analysis and classification of previous studies that focus on the development of various technological processes and their implementation was carried out. As a result of the analysis, a systematized approach to the creation of a comprehensive scheme for the development of additive technologies related to the development of technologies in various directions was proposed.

show abstract

“…Задачі упаковки сфер та кубів у контейнери різноманітних форм нині актуальні [1][2][3][4]. Вони мають важливе прикладне значення у космічній інженерії та ракетобудуванні, в адитивному виробництві (3D-друк), при формуванні завадостійких кодів, при дослідженні кристалічних структур, при проєктуванні та компоновці різноманітних технологічних обʼєктів і систем, при оптимізації зберігання, захисту та транспортування товарів і т.д.…”

Section: вступunclassified

“…Підвищення конкурентноздатності алгоритмів розвʼязання подібних задач повʼязано як з новими теоретичними результатами, так і з використанням нових (суперкомпʼютерних, грід-і хмарних) технологій. Зокрема, в роботі [1] запропоновано загальну методологію розвʼязання оптимізаційної задачі упаковки багатовимірних гіперсфер; у роботі [2] запропоновано підхід для розвʼязання задачі заповнення прямокутного 3D-обʼєму нерівними сферами, яка виникає в адитивному виробництві. Робота [3] присвячена застосуванню технологій паралельних обчислень [5,6] у системах зі спільною памʼяттю та розподіленою памʼяттю для розвʼязання оптимізаційних задач геометричного проєктування.…”

Section: вступunclassified

Mathematical Models and Algorithms for Optimal Packing of Balls and Cubes Into Spherical and Cubic Containers

Stetsyuk¹,

Berezovskyi²,

Lykhovyd³

et al. 2022

PC&I

View full text Add to dashboard Cite

The article considers mathematical models and algorithms for optimal balancedsparse packing of spheres and cubes into spherical and cubic containers. A balanced sparse (allowable distances between objects are specified) packing of objects into an outer container is such a packing that the center of gravity of thefamily of objects coincides with the center of the outer container, and the distances between the objects as well as the distances from them to the outer container are not less than the predetermined values. Mathematical models, sequential and parallel algorithms for solving problems of finding a balanced sparsepacking of balls of different radii into spherical and cubic containers are given.A mathematical model of the problem of finding a balanced sparse packing ofcubes into a cube of minimum volume, provided that the sides of all cubes areparallel to the coordinate axes, and a description of the non-smooth penaltyfunction for finding local minima of the problem are given. The investigatedproblems belong to the class of NP-hard problems. Mathematical models arerepresented by multi-extremal nonlinear programming problems. To find thebest feasible solution, the multistart method is used in combination with Shor's ralgorithm. For this, the problem is reduced to the unconditional optimizationproblem using penalty functions in the form of maximum functions, and nonsmooth optimization methods based on the use of software implementations of ralgorithm are used to find local minima from a set of starting points. Mathematical models and sequential and parallel algorithms under consideration can beused to develop software tools for solving problems of finding a balanced sparsepacking of spherical and cubic objects into spherical and cubic containers. Thematerial is presented in three sections. The first section presents a mathematicalmodel and algorithms for solving the problem of finding a balanced sparse packing of balls of different radii into a spherical container. The sequential and parallel algorithms for finding the best feasible problem solution are described. Section 2 provides a mathematical model and algorithms for solving the problem offinding a balanced sparse packing of balls of different radii into a cubic container. The sequential and parallel algorithms for finding the best feasible problemsolution are described. Section 3 presents a mathematical model of the problemof finding a balanced sparse packing of cubes into a cubic container. A description ofthe non-smooth penalty function for finding local minima of the problem is given.

show abstract

Optimized Filling of a Given Cuboid with Spherical Powders for Additive Manufacturing

Cited by 34 publications

References 43 publications

Selective Laser Melting (SLM) Additively Manufactured CoCrFeNiMn High-Entropy Alloy: Process Optimization, Microscale Mechanical Mechanism, and High-Cycle Fatigue Behavior

Selective Laser Melting (SLM) Additively Manufactured CoCrFeNiMn High-Entropy Alloy: Process Optimization, Microscale Mechanical Mechanism, and High-Cycle Fatigue Behavior

Developmental review of metal additive manufacturing processes

Mathematical Models and Algorithms for Optimal Packing of Balls and Cubes Into Spherical and Cubic Containers

Contact Info

Product

Resources

About