603 research outputs found
Index to NASA Tech Briefs, 1972
Abstracts of 1972 NASA Tech Briefs are presented. Four indexes are included: subject, personal author, originating center, and Tech Brief number
Nondestructive Testing (NDT)
The aim of this book is to collect the newest contributions by eminent authors in the field of NDT-SHM, both at the material and structure scale. It therefore provides novel insight at experimental and numerical levels on the application of NDT to a wide variety of materials (concrete, steel, masonry, composites, etc.) in the field of Civil Engineering and Architecture
Non-destructive testing and evaluation of composite materials/structures: A state-of-the-art review
Composite materials/structures are advancing in product efficiency,
cost-effectiveness and the development of superior specific properties. There
are increasing demands in their applications to load-carrying structures in
aerospace, wind turbines, transportation, and medical equipment, etc. Thus
robust and reliable non-destructive testing (NDT) of composites is essential to
reduce safety concerns and maintenance costs. There have been various NDT
methods built upon different principles for quality assurance during the whole
lifecycle of a composite product. This paper reviews the most established NDT
techniques for detection and evaluation of defects/damage evolution in
composites. These include acoustic emission, ultrasonic testing, infrared
thermography, terahertz testing, shearography, digital image correlation, as
well as X-ray and neutron imaging. For each NDT technique, we cover a brief
historical background, principles, standard practices, equipment and facilities
used for composite research. We also compare and discuss their benefits and
limitations, and further summarise their capabilities and applications to
composite structures. Each NDT technique has its own potential and rarely
achieves a full-scale diagnosis of structural integrity. Future development of
NDT techniques for composites will be directed towards intelligent and
automated inspection systems with high accuracy and efficient data processing
capabilities
12th EASN International Conference on "Innovation in Aviation & Space for opening New Horizons"
Epoxy resins show a combination of thermal stability, good mechanical performance, and durability, which make these materials suitable for many applications in the Aerospace industry. Different types of curing agents can be utilized for curing epoxy systems. The use of aliphatic amines as curing agent is preferable over the toxic aromatic ones, though their incorporation increases the flammability of the resin. Recently, we have developed different hybrid strategies, where the sol-gel technique has been exploited in combination with two DOPO-based flame retardants and other synergists or the use of humic acid and ammonium polyphosphate to achieve non-dripping V-0 classification in UL 94 vertical flame spread tests, with low phosphorous loadings (e.g., 1-2 wt%). These strategies improved the flame retardancy of the epoxy matrix, without any detrimental impact on the mechanical and thermal properties of the composites. Finally, the formation of a hybrid silica-epoxy network accounted for the establishment of tailored interphases, due to a better dispersion of more polar additives in the hydrophobic resin
The 1st Advanced Manufacturing Student Conference (AMSC21) Chemnitz, Germany 15–16 July 2021
The Advanced Manufacturing Student Conference (AMSC) represents an educational format designed to foster the acquisition and application of skills related to Research Methods in Engineering Sciences. Participating students are required to write and submit a conference paper and are given the opportunity to present their findings at the conference. The AMSC provides a tremendous opportunity for participants to practice critical skills associated with scientific publication. Conference Proceedings of the conference will benefit readers by providing updates on critical topics and recent progress in the advanced manufacturing engineering and technologies and, at the same time, will aid the transfer of valuable knowledge to the next generation of academics and practitioners.
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The first AMSC Conference Proceeding (AMSC21) addressed the following topics: Advances in “classical” Manufacturing Technologies, Technology and Application of Additive Manufacturing, Digitalization of Industrial Production (Industry 4.0), Advances in the field of Cyber-Physical Systems, Virtual and Augmented Reality Technologies throughout the entire product Life Cycle, Human-machine-environment interaction and Management and life cycle assessment.:- Advances in “classical” Manufacturing Technologies
- Technology and Application of Additive Manufacturing
- Digitalization of Industrial Production (Industry 4.0)
- Advances in the field of Cyber-Physical Systems
- Virtual and Augmented Reality Technologies throughout the entire product Life Cycle
- Human-machine-environment interaction
- Management and life cycle assessmen
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