Читать книгу Metal Additive Manufacturing - Ehsan Toyserkani - Страница 29

This textbook includes 12 chapters. In Chapter 1, an overview of metal AM, its applications, opportunities, and challenges are provided at a high level.

Chapter 2 provides further detail on metal AM processes, their advantages and disadvantages. The chapter also lists critical process parameters in three main metal AM processes (DED, PBF, and BJ), while pinpointing the importance of the use of combined parameters in process development.

Chapter 3 highlights the major subsystems used in metal AM processes. This chapter particularly explains how a laser system works while highlighting different classes of lasers and also laser beam properties. The chapter also explains about electron beam as a major source of energy for AM processes. This chapter sheds some light on different material delivery systems, including powder feeders. In addition, some basic information on the digital files needed for AM processes is provided.

Chapter 4 starts with the fundamental of laser and e‐beam material processing. It then covers major physics associated with DED processes with a particular focus on LDED. The chapter entails several case studies for modeling and analysis of DED processes such as powder‐fed LDED and wire‐fed DED.

Chapter 5 customizes the physics discussed for PBF processes such as LPBF and EPBF. It also sheds some light on heat source models used in the modeling of PBF processes as well as a few case studies.

Chapter 6 explains the modeling and physics of binder jetting and material jetting AM processes.

Chapter 7 covers the physics of material extrusion briefly. It sheds some light on the interaction of multiple physical phenomena.

Chapter 8 starts with a review of relevant historical background on material science. It then focuses on the comparison of conventional versus AM processes within the context of material properties. It discusses the fundamentals of solidification as well as factors affecting solidification in AM and phase transformation for different alloys used in metal AM.

Chapter 9 explains the concept of Metal Matrix Composites (MMCs). It also covers applications of AM technology in the fabrication of MMCs and possible challenges. It also sheds some light on the differentiation of categories of MMCs in AM, e.g. ferrous matrix composites, titanium matrix composites, aluminum matrix composites, nickel matrix composites.

Chapter 10 sheds some light on new design frameworks tailored to AM. It helps the reader to understand the importance of design rules and guidelines and how they differ between AM processes. It covers the theoretical framework supporting topology optimization, efforts toward including AM constraints in topology optimization models and a typical workflow of basic topology optimization in AM. It elaborates on the important terminologies that define lattice structures and helps the reader understand some practical lattice design methodologies. It also explains the significance and design strategies of support structures for the success of the printing process and product quality while improving the reader's understanding of design workflows for AM through case studies.

Chapter 11 explains different classes of in‐situ sensing devices used for AM processes. It covers theories of some of the sensors used in AM, while shedding light on various applications of statistical approaches as quality assurance paradigms. It ends with fundamental and applications of machine learning techniques to AM and a case study.

Chapter 12 is mainly concerned with safety regulations in the AM industry. A basic understanding of AM process hazards, hazardous materials in AM, and associated safety matters in laser‐based and electron beam AM techniques is covered. It also briefly explains human health hazards in AM and the comprehensive steps necessary for safety management.