An Effective Life Extension Technology for 7xxx Series Aluminium Alloys by Laser Shock Peening PDF Download
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Author:
Publisher:
ISBN:
Category : Airframes
Languages : en
Pages :
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Book Description
This report summarises the state-of-the-art, benefits, limitations and risks of laser shock peening (LSP). The experimental results showed that LSP technology can effectively extend fatigue life for AA7075 Al alloy. However, the fatigue lives in LSP treated AA7050 specimens are reduced when the laser power density exceeds 3 GW/cm2. The cause for the reduction of the fatigue life was determined to be internal cracking, surface "burnt" defects, or "over-peening" due to inappropriate LSP processing. Numerical analysis has been carried out to investigate the effect of laser power density on both dynamic and residual stresses. The optimum process conditions for LSP were established, and the cost-effectiveness of the technique has been analysed. The DSTO investigation showed that LSP is an effective fatigue life extension technology, although it has a high capital investment and running costs.
Author:
Publisher:
ISBN:
Category : Airframes
Languages : en
Pages :
Get Book Here
Book Description
This report summarises the state-of-the-art, benefits, limitations and risks of laser shock peening (LSP). The experimental results showed that LSP technology can effectively extend fatigue life for AA7075 Al alloy. However, the fatigue lives in LSP treated AA7050 specimens are reduced when the laser power density exceeds 3 GW/cm2. The cause for the reduction of the fatigue life was determined to be internal cracking, surface "burnt" defects, or "over-peening" due to inappropriate LSP processing. Numerical analysis has been carried out to investigate the effect of laser power density on both dynamic and residual stresses. The optimum process conditions for LSP were established, and the cost-effectiveness of the technique has been analysed. The DSTO investigation showed that LSP is an effective fatigue life extension technology, although it has a high capital investment and running costs.
Author: Shiding Sun
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Since their introduction in the 1920s, 5xxx series aluminum (Al) alloys have been widely employed for marine applications. The 5083-H116 Al alloy plates, in particular, are still used in the hull construction of many military and commercial vessels. However, the high amount of magnesium (Mg) contained in Al-Mg solids leads to thermodynamic instability. When these Al alloys are exposed to elevated temperatures, the Al3Mg2 phase is precipitated on the grain boundaries, making them susceptible to stress corrosion cracking (SCC). By introducing compressive residual stress on the surface of metallic materials, laser shock peening (LSP) has been demonstrated to improve mechanical properties, wear resistance, and fatigue life; and it is considered to be a very promising method for effectively preventing SCC problems. Currently, most LSP can only be carried out in a lab environment using Nd:Glass or Nd:YAG lasers with high pulse energy (over 1 J). The cumbersome equipment, complicated procedures, terrible efficiency, high cost, and rigorous requirements for the operating environment greatly limit the application and potential use of LSP. This study investigated an LSP processing technology for 5xxx series Al alloys using a low pulse energy Nd:YAG laser. Through systematic experiments and tests, the feasibility and effects of this technology were confirmed. After careful parameter optimization, a high level compressive residual stress (about -250 MPa) was achieved on 5083-H116 Al alloy plates. After LSP, the surface hardness and the yield strength of the Al material were enhanced about 20% and 10%, respectively. Moreover, the in-lab test results indicated that the service life of 5083-H116 Al alloy was extended obviously in an SCC-susceptible environment. These results are significant because a peening effect comparable to conventional high-energy LSP techniques was achieved using a Nd:YAG laser with a much lower pulse energy (0.65 J). Based on these results, a portable industrial LSP system was designed, built, and tested, which is capable of operation in harsh environments for on-site repair of marine vessels with an SCC problem and prevention of SCC in the future.
Author: K. Ding
Publisher: CRC Press
ISBN: 9780849334443
Category : Technology & Engineering
Languages : en
Pages : 182
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Book Description
Laser shock peening (LSP) is a process for inducing compressive residual stresses using shock waves generated by laser pulses. It is a relatively new surface treatment for metallic materials that can greatly improve their resistance to crack initiation and propagation brought on by cyclic loading and fatigue. This book, the first of its kind, consolidates the scattered knowledge about LSP into one comprehensive volume. It describes the mechanisms of LSP and its substantial role in improving fatigue performance in terms of modification of microstructure, surface morphology, hardness, and strength. In particular, it describes numerical simulation techniques and procedures that can be adopted by engineers and research scientists to design, evaluate, and optimize LSP processes in practical applications.
Author: Roy Elliott
Publisher: Butterworth-Heinemann
ISBN: 148319230X
Category : Technology & Engineering
Languages : en
Pages : 253
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Book Description
Cast Iron Technology presents a critical review of the nature of cast irons. It discusses the types of cast iron and the general purpose of cast irons. It also presents the history of the iron founding industry. Some of the topics covered in the book are the description of liquid metal state; preparation of liquid metal; process of melting; description of cupola melting and electric melting methods; control of composition of liquid metal during preparation; description of primary cast iron solidification structures; and thermal analysis of metals to determine its quality. Solidification science and the fundamentals of heat treatment are also discussed. An in-depth analysis of the hot quenching techniques is provided. The graphitization potential of liquid iron is well presented. A chapter is devoted to microstructural features of cast iron. The book can provide useful information to iron smiths, welders, students, and researchers.
Author: Michael J Neale
Publisher: Elsevier
ISBN: 0080519660
Category : Technology & Engineering
Languages : en
Pages : 577
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Book Description
The renowned reference work is a practical guide to the selection and design of the components of machines and to their lubrication. It has been completely revised for this second edition by leading experts in the area.
Author: David E.J. Talbot
Publisher: CRC Press
ISBN: 1351259903
Category : Technology & Engineering
Languages : en
Pages : 699
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Book Description
Twenty years after its first publication, Corrosion Science and Technology continues to be a relevant practical guide for students and professionals interested in material science. This Third Edition thoroughly covers the basic principles of corrosion science in the same reader-friendly manner that made the previous edition invaluable, and enlarges the scope of the content with expanded chapters on processes for various metals and new technologies for limiting costs and metal degradation in a variety of commercial enterprises not explored in previous editions. This book also presents expertly developed methods of corrosion testing and prediction.
Author: Fumio Hine
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 248
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Book Description
Author: T. W. Clyne
Publisher: Cambridge University Press
ISBN: 1108837891
Category : Science
Languages : en
Pages : 297
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Book Description
Discover a novel approach to the subject, providing detailed information about established and innovative mechanical testing procedures.
Author: Roger C. Reed
Publisher: Cambridge University Press
ISBN: 1139458639
Category : Technology & Engineering
Languages : en
Pages : 363
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Book Description
Superalloys are unique high-temperature materials used in gas turbine engines, which display excellent resistance to mechanical and chemical degradation. This book introduces the metallurgical principles which have guided their development. Suitable for graduate students and researchers, it includes exercises and additional resources at www.cambridge.org/9780521859042.
Author: Ad Vlot
Publisher: Springer Science & Business Media
ISBN: 030648398X
Category : Technology & Engineering
Languages : en
Pages : 224
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Book Description
Glare is the name given to a new material for aircraft structures developed at Delft University in the Netherlands. It consists of thin aluminium layers bonded together by adhesive containing embedded fibres and is very resistant to fatigue. This book gives the inside story of how the development of Glare took place. It took more than two decades from the first tests in Delft to the major breakthrough following the decision of Airbus to apply the material on the A380 super-jumbo. This success was achieved by a small group of people inspired by professor Boud Vogelesang, people who kept believing in the material and fought against all obstacles during the years. This book tells the story of the ups and downs and the final success of their efforts.
