The paper presents the thermal deformations of a CFRP High Dimensional Stability Structure. With an experimental facility designed and tested to undergo negligible deformations, ten points of the UV-spectrometer' support (Test Article, TA) have been monitored with triaxial capacitive transducers, both in vacuum and in dry nitrogen atmosphere, with temperature variations in the range 253÷333K. The measured deformations differ from point to point: +4.05±0.01μm/K has been the largest dimensional variation measured in one point of TA and in one direction, whereas -0.05±0.02μm/K has been the smallest one, in another point and in a different direction. All the obtained results agree within ±2μm/K with the computer simulated tests accomplished in the design of TA. A complete analysis of the sources of uncertainty assures the displacement' measurements' accuracy has been ≤0.1μm, whatever the experimental conditions. The dimensional stability of the TA has been verified finally with a series of hygro-thermal cycles The results show that permanent deformations not larger than ±2μm occurred in a limited number of points.

The dimensional stability of a CFRP structure probed with sub-micrometer accuracy in varying external condition / Giaretto, Valter; Miraldi, Elio; Ruscica, Giuseppe; Cabiati, F.; Dosio, D.. - 386 (1):(1996), pp. 345-349. (Intervento presentato al convegno International Conference on Spacecraft Structures and Mechanical Testing tenutosi a Noordwijk (NLD) nel 27-29 March 1996).

The dimensional stability of a CFRP structure probed with sub-micrometer accuracy in varying external condition

GIARETTO, Valter;MIRALDI, ELIO;RUSCICA, GIUSEPPE;
1996

Abstract

The paper presents the thermal deformations of a CFRP High Dimensional Stability Structure. With an experimental facility designed and tested to undergo negligible deformations, ten points of the UV-spectrometer' support (Test Article, TA) have been monitored with triaxial capacitive transducers, both in vacuum and in dry nitrogen atmosphere, with temperature variations in the range 253÷333K. The measured deformations differ from point to point: +4.05±0.01μm/K has been the largest dimensional variation measured in one point of TA and in one direction, whereas -0.05±0.02μm/K has been the smallest one, in another point and in a different direction. All the obtained results agree within ±2μm/K with the computer simulated tests accomplished in the design of TA. A complete analysis of the sources of uncertainty assures the displacement' measurements' accuracy has been ≤0.1μm, whatever the experimental conditions. The dimensional stability of the TA has been verified finally with a series of hygro-thermal cycles The results show that permanent deformations not larger than ±2μm occurred in a limited number of points.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/1412765
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