Instumentation of Ultrasonic High-Frequency Machine to Estimate Applied Stress in Middle Section of Specimen

Yoann Lage, Manuel Freitas, Luís Reis, A. M. R. Ribeiro, Diogo Montalvao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

The objective of this paper is to describe the instrumentation of a new developed ultrasonic fatigue testing machine at 20 kHz working frequency and compare the possible solutions to estimate the stress applied in the middle section of the specimen. Stress is estimated by measuring the displacement on bottom of the specimen and their strain on middle section.
The monitoring of the displacement, considered here in the bottom face of the specimen, is carried out using a high resolution laser, the strain using a strain gauge in middle of specimen and field temperature using a pyrometer and thermographic camera.
A LabVIEW routine is used to control the initial parameters of the transducer, such as the frequency reset, the frequency seek, the load amplitude and to record data of all sensors. To manage and process the data, a data acquisition device working at 400 kHz from National Instruments is used.
Original languageEnglish
Title of host publicationProcs of 15th International Conference on Experimental Mechanics
Subtitle of host publicationICEM15
EditorsJ.F. Silva Gomes, Mario A.P. Vaz
Publication statusPublished - Jul 2012
Event15th International Conference on Experimental Mechanics - Porto, Portugal
Duration: 22 Jul 201227 Jul 2012

Conference

Conference15th International Conference on Experimental Mechanics
Country/TerritoryPortugal
CityPorto
Period22/07/1227/07/12

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