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Wpływ podciśnienia na charakter zjawiska relaksacji naprężeń specjalnych struktur granulowanych w próbach jednoosiowego ściskania

Zalewski R., Bajkowski J.

Modelowanie Inżynierskie

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2008

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T. 4, nr 35

147-154

PL

W pracy zaproponowano nową strukturę semiinteligentną. Jest nią konglomerat zbudowany z luźnego materiału sypkiego, umieszczonego w szczelnej, plastomerowej osnowie, w której w dalszym etapie wytwarza się podciśnienie. Wartość zadanego podciśnienia wpływa na globalne właściwości fizyczne tak utworzonej struktury. Omówiono szczegółowo parametry przeprowadzonych prób relaksacji naprężeń w przypadku ściśniętych jednoosiowo próbek granulowanych oraz zbadano wpływ podciśnienia na spadek naprężeń występujących podczas trwania prób reologicznych.

EN

In this paper a new semi-intelligent structure has been introduced. It is a conglomerate composed on the basis of loose material, placed in a hermetic, plastomer envelope, where in the next stage so-called underpressure is generated. The higher value of the underpressures causes increasing of overall mechanical properties of the conglomerate. The main objective of the paper was to evaluate the underpressure influence on experimentally observed stress relaxation tests. Only uniaxial compression tests results have been taken into consideration. Experimental conditions have been discussed in details. The underpressure value impact on the stress decreasing during experiments has been described and illustrated in suitable figures.

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Development of novel piezoceramic actuator modules for the embedding in intelligent lightweight structures

Hufenbach W., Gude M., Modler N., Kirvel C.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 24, nr 1

390-396

EN

Purpose: Piezoceramic actuators in lightweight structures enable a purposeful manipulation of the dynamic and vibroacoustic structural behaviour. Above it, further studies focus on the application of thin and flexible piezoceramic modules as power sources in morphing structures aiming at a shape adaptation. Design/methodology/approach: A specific example of novel morphing structures is introduced, which rely on multistable deformation phenomena of fibre-reinforced composites with an unsymmetric lay-up. For the large-scale capable utilisation of such active structural parts made of fibre-reinforced thermoplastic composites, novel piezoceramic modules, which are specifically tailored to the structural material, and required manufacturing methods are developed. Findings: The piezoceramic modules with the highly regarded compatibility to thermoplastic composites permit their substantially coherent and homogeneous integration in the fibre composite structure without intricate adhesive assembly effort. Furthermore, thermally induced residual compressive stresses during the manufacturing process serve for purposefully prestressing the piezoceramic components to reduce the module's sensitivity to tensile loading. Research limitations/implications: For the manufacture of those novel piezoceramic modules, a continuously operating fabrication method has been developed. By the process-related integration of a hot press, residual compression stresses are thermally induced into the modules that considerably contribute to the decrease of the piezoceramic module's sensitivity to tension. Originality/value: The successful development of the novel TPM offers a significant advancement in the efficiency within the large scale production of novel intelligent lightweight structures.

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Struktury inteligentne nasycone światłowodami w budowie i eksploatacji maszyn

Wojnar E.

Mechanik

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2000

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R. 73, nr 5-6

443-445

PL

Rozległe czujniki światłowodowe zanurzone w kompozycie, w betonie przymocowane do powierzchni dużych konstrukcji stalowych tworzą strukturę wrażliwą - materiał inteligentny. Struktury wrażliwe mogą mierzyć i monitorować temperaturę, wibracje, przyspieszenia i uszkodzenia. Struktury światłowodowe moga mieć zastosowanie w budowie i eksploatacji maszyn i urządzeń.

EN

Widely extended optical fibre sensors embedded in a composite of concrete, fastended to the surfaces of large steel structure create a sensitive, intelligent material. It can measure and monitor temperature, vibration, accelerations and damages. The optical fibre structure can be applied in the building and operation of mahines and equipment.