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Comparison of cracking characteristics as functions of heat flux was completed for unnotched specimens (both 3/8 and 3/16 inch wall thickness) of the five materials under study. A distinct relative rating of each materials' ability to withstand thermal shock and thermal stresses was obtained. In addition, the results permitted a differentiation between the relative thermal shock-stress resistance of the two wall thicknesses investigated. (Author).
The relative thermal stress resistance of five potential radome materials was experimentally determined for heating conditions which simulated radome environments. The effects of wall thickness and notches were also studied. Pyroceram 9608 was found to be the most thermal stress resistant of the five materials studied; the others, in decreasing order of merit, were Pyrex 7740, AD-99 alumina, MgO (99+% dense), Alundum RA-3360. The effects of notches and of the wall thicknesses studied (1/4 inch and 3/8 inch) were small compared with the differences between materials. However, theoretical considerations, together with extrapolation of experimental results, indicated that considerable improvement in thermal stress resistance might be obtained from much smaller wall thicknesses (0.10 inch or less). A fair correlation was obtained between the experimental results and four pertinent parameters. Pyroceram 9608 ranked as the most thermal stress resistant material in the ratings obtained from all four parameters. (Author).
This handbook presents an authoritative account of the potential of advanced ceramics and composites in strategic applications, including defense, national security, aerospace, and energy security (especially nuclear energy). It highlights how their unique combination of superior properties such as low density, high strength, high elastic modulus, high hardness, high temperature capability, and excellent chemical and environmental stability are optimized in technologies within these fields. The handbook is organized according to application type. It allows readers to learn about strategies that have been used in different fields and to transfer them to their own. The book addresses a wide variety of ceramics and their composites, including PZT ceramics, carbon nanotubes, aerogels, silica radomes, relaxor ferroelectrics, and many others.
This open access book presents established methods of structural health monitoring (SHM) and discusses their technological merit in the current aerospace environment. While the aerospace industry aims for weight reduction to improve fuel efficiency, reduce environmental impact, and to decrease maintenance time and operating costs, aircraft structures are often designed and built heavier than required in order to accommodate unpredictable failure. A way to overcome this approach is the use of SHM systems to detect the presence of defects. This book covers all major contemporary aerospace-relevant SHM methods, from the basics of each method to the various defect types that SHM is required to detect to discussion of signal processing developments alongside considerations of aerospace safety requirements. It will be of interest to professionals in industry and academic researchers alike, as well as engineering students. This article/publication is based upon work from COST Action CA18203 (ODIN - http://odin-cost.com/), supported by COST (European Cooperation in Science and Technology). COST (European Cooperation in Science and Technology) is a funding agency for research and innovation networks. Our Actions help connect research initiatives across Europe and enable scientists to grow their ideas by sharing them with their peers. This boosts their research, career and innovation.