Measurement of stiffness coefficients at elevated temperatures by means of laser-generated ultrasonic waves

Autor:	B. Audoin, C. Bescond, S. Guilbaud
Rok vydání:	1998
Předmět:	Materials science General Engineering Stiffness Acoustic wave Laser law.invention Interferometry law Ceramics and Composites medicine Ultrasonic sensor medicine.symptom Composite material Anisotropy Material properties Stiffness matrix
Zdroj:	Composites Science and Technology. 58:741-746
ISSN:	0266-3538
Popis:	The stiffness tensor of a balanced composite material is described by six coefficients. Four of them are measured by means of a non-contact technique consisting of the focusing of a pulsed laser in one side of the sample. A laser interferometric probe is used on the other side to detect the acoustic wave fronts. These devices are associated with a specific oven that allows the transmission of the optical beams. The four coefficients are measured for various temperatures, increasing by steps up to the glass transition temperature. The sensitivity of the measurement is convenient to detect the stiffness coefficient changes which show the anisotropy of the changes of material properties induced by temperature.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7d251666c418e85111257ed005936fbd https://doi.org/10.1016/s0266-3538(97)00157-7 Zobrazit plný text záznamu Full Text from ScienceDirect