Wyniki wyszukiwania - BazTech

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Functional materials produced on an industrial scale

Barska J., Kłysz S.

Prace Naukowe Instytutu Technicznego Wojsk Lotniczych

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2015

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nr 36

19--30

EN

The article presents a wide range of applications of functional materials and a scale of their current industrial production. These are the materials which have specific characteristics, thanks to which they became virtually indispensable in certain constructional solutions. Their basic characteristics, properties, methods of production and use as smart materials were described.

2

The Study of Behavior of Vibrating Systems Controllable by Devices with Rheological Fluid

Szary M. L., Weber P.

Archives of Acoustics

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2013

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Vol. 38, No. 2

217--222

EN

The nonlinear mathematical model of behavior of controllable viscosity fluid (CVF) under applied external field is presented. A large family of these fluids is commonly used to control responding forces of dampers in vibration control applications. The responding force of a damper with CVF has two components. The first one - uncontrollable - is proportional to the viscosity of a base fluid and velocity of its motion, the second one, which is controllable, depends on the strength of the applied external field. Both are involved in the process of dissipation of unwanted energy from the vibrating systems. An equivalent damping factor based on the principle of energy dissipated during one cycle of damper work under a constant strength external field was calculated. When mass or stiffness is variable the equivalent damping factor can be set accordingly by adjusting the strength of external field to have vibrating damped system purposely/continuously working in the critical or other chosen state. This paper also presents cases of applying periodically changing strengths of an external field synchronized with cycles of periodical motion of the vibrating system to continuously control the damping force within each cycle.

3

Intelligent materials 2004

Wojciechowski S., Boczkowska A.

Archives of Metallurgy and Materials

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2004

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Vol. 49, iss. 4

723-734

EN

Synthetic overview of the state of knowledge in the field of intelligent materials will be made. Interest in intelligent materials has been growing rapidly from the late 1980 ties of the XX c. One can state that they have currently become an individual group of materials. In the English language literature the terminology varies, two terms coexist: "intelligent materials" and "smart materials", however sometimes they are also called "adaptive materials". On a basis of literature survey, as the most important intelligent materials, shape memory alloys, ceramic piezoelectric materials, magnetostrictive materials, rheological fluids, intelligent polymers and its composites have been selected. Interest in exhibiting intelligent behavior of polymers appeared much latter than it was in the case of metallic or ceramic intelligent materials. Within last two decades the role of intelligent polymers grew rapidly due to the promising results of research proving that some polymers show properties useful for practical applications. Available scientific data indicates that current level of knowledge on intelligent polymers varies substantially and very basic reports appear parallel to much matured and advanced developments, which are ready for implementations. The second part of the paper brings brief analysis of the scope of the Smart Structures / NDE Joint SPIE Conference, held at San Diego in March 2004.

PL

W artykule przedstawiono w sposób syntetyczny stan wiedzy w obszarze materiałów inteligentnych. Zainteresowanie materialami inteligentnymi wzrosło gwałtownie w końcu lat 80-tych XX wieku. Można uznać, że aktualnie stanowią one indywidualną klasę materiałów. w publikacji w języku angielskim terminologia nie jest jednolita i wspołistnieją dwie nazwy: "intelligent materials" i "smart materials", a czasami sa one określane jako "adaptive materials". Na podstawie przeglądu literatury uznać można, że materiałami inteligentnymi o największym znaczeniu są: stopy z pamięcią kształtu, ceramiczne materiały piezoelektryczne, materiały magnetostrykcyjne, ciecze reologiczne oraz inteligentne polimery i ich kompozyty. Zainteresowanie polimerami inteligentnymi pojawiło się znacznie później niż materiałami ceramicznymi i metalowymi. W ciągu ostatnich dwóch dekad znaczenie inteligentnych polimerów gwałtownie wzrosło w wyniku obiecujących możliwości ich praktycznego zastosowania. Dostepne wyniki badań wskazują, że stopień zaawansowania wiedzy dotyczącej inteligentnych materiałów polimerowych jest zróżnicowany. Istnieją wyniki badań podstawowych, a jednocześnie wyniki wskazujące na możliwość już zaawansowanego wykorzystania. W części drugiej artykułu przedstawiono sysntetyczny przegląd materiałów z konferencji "Smart Structures and Materials 2004 and Nondestructive Evaluation for Health monitoring and Diagnostics 2004", która odbyła się w San Diego w marcu 2004.