Results for 'titan'

1. Nathalie A Cabrol

The Secret Life of the Universe

1. Jessy

Modeling Continuous-Wave Laser Beam Welding of Titanium Alloy: A Computational Approach

This licentiate book addresses an aspect of production technology that is metal processing through fusion. A challenge to take up in production technol-ogy is to develop sustainable manufacturing processes to save both material and energy consumption. A metal fusion heat source with high ef¿ciency is laser beam. The industrial demand to increase the productivity and improve the robustness of high-power laser beam welding (LBW) and laser beam addi-tive manufacturing (LBAM) processes is driving huge research efforts towards the repeatability and reliability of the processes. Application of high-power continuous-wave laser beam for metal fusion in areas such as welding and ad-ditive manufacturing (AM) has increased during the last years with rapid pace. Continuous-wave lasers have proven their great performance in terms of their stability and power output during processing. However laser metal fusion is very complicated, and more detailed physical understanding would improve this process. The aim of this licentiate book is to reach better model reliability and deeper understanding of continuous-wave LBW of a Titanium alloy (Ti-6Al-4V) in conduction mode through a Computational Fluid Dynamics (CFD) approach.

Thermodynamic Mechanism of Cryogenic Air Minimum Quantity Lubrication Grinding

The achievement of high-efficiency and precise grinding of difficult-to-cut metals-like titanium alloys-is essential in the aerospace industry. However, the process often results in thermal damage to the workpiece surface, posing a significant technical challenge. While minimum quantity lubrication (MQL) has been used to aid titanium alloy grinding, its effectiveness is limited by insufficient heat dissipation and lubrication. As an alternative to normal temperature air for carrying micro-lubricants, Cryogenic air has shown promise in improving oil film heat transfer and lubrication performance in the grinding zone, thus reducing workpiece surface thermal damage. The experimental state of the technology demands more comprehensive studies on its effectiveness and on the underlying mechanisms. Thermodynamic Mechanism of Cryogenic Air Minimum Quantity Lubrication Grinding addresses these challenges by providing a theoretical framework for understanding and optimizing cryogenic air minimum quantity lubrication in grinding processes, particularly for titanium alloys. It explores the physical characteristics of lubricants under cryogenic conditions, the influence of low temperatures on atomization effects, droplet formation dynamics, and heat transfer mechanisms within the grinding zone. By establishing quantitative relationships between cryogenic air parameters and lubricant properties, the book lays a foundation for enhancing the cooling lubrication mechanism of cryogenic air MQL in grinding processes. Researchers, scholars, and graduate students in universities and research institutes focusing on machining will find this book invaluable, as it goes beyond the theoretical insights into practical solutions to enhance grinding efficiency and reduce thermal damage.

Thermodynamic Mechanism of Cryogenic Air Minimum Quantity Lubrication Grinding

The achievement of high-efficiency and precise grinding of difficult-to-cut metals-like titanium alloys-is essential in the aerospace industry. However, the process often results in thermal damage to the workpiece surface, posing a significant technical challenge. While minimum quantity lubrication (MQL) has been used to aid titanium alloy grinding, its effectiveness is limited by insufficient heat dissipation and lubrication. As an alternative to normal temperature air for carrying micro-lubricants, Cryogenic air has shown promise in improving oil film heat transfer and lubrication performance in the grinding zone, thus reducing workpiece surface thermal damage. The experimental state of the technology demands more comprehensive studies on its effectiveness and on the underlying mechanisms. Thermodynamic Mechanism of Cryogenic Air Minimum Quantity Lubrication Grinding addresses these challenges by providing a theoretical framework for understanding and optimizing cryogenic air minimum quantity lubrication in grinding processes, particularly for titanium alloys. It explores the physical characteristics of lubricants under cryogenic conditions, the influence of low temperatures on atomization effects, droplet formation dynamics, and heat transfer mechanisms within the grinding zone. By establishing quantitative relationships between cryogenic air parameters and lubricant properties, the book lays a foundation for enhancing the cooling lubrication mechanism of cryogenic air MQL in grinding processes. Researchers, scholars, and graduate students in universities and research institutes focusing on machining will find this book invaluable, as it goes beyond the theoretical insights into practical solutions to enhance grinding efficiency and reduce thermal damage.

1. Nathalie A Cabrol

The Secret Life of the Universe

1. Andrew Cohen

The Universe

Every night, above our heads, a drama of epic proportions is playing out. Diamond planets, zombie stars, black holes heavier than a billion Suns. The cast of characters is extraordinary, and each one has its own incredible story to tell.