A low-cost residual stress measuring instrument

BALDI, ANTONIO;BERTOLINO, FILIPPO
2017

Abstract

The hole-drilling method is the approach most used for residual stress measurement and most of the commercially available instruments are based on this working principle. The idea is quite simple: drill a small hole on the surface of the components and measure the strain/displacement components resulting on the surface. The stress components can be estimated from these data with a reverse calibration process. The measurement of the displacement/strain field is usually performed using either strain gauges or interferometric optical methods, thus the cost of the instruments is significant. Recently, it has been proposed to replace the interferometric method with an integrated Digital Image Correlation (i-DIC) approach: by using problem-specific displacement functions, all difficulties related to the low sensitivity of DIC are avoided and the measurement procedure simply requires acquisition of an image after each drilling step. This paper describes the development of a low-cost instrument based on this working principle: the imaging subsystem is based on a Raspberry-Pi camera module whereas step motors are controlled by an Arduino board. Finally, the frame is built using a 3d-printer.
Inglese
Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems, Volume 9. Proceedings of the 2016 Annual Conference on Experimental and Applied Mechanics
978-3-319-42255-8
Springer
Simon Quinn, Xavier Balandraud
9
113
119
7
http://www.springer.com/series/8922
Annual Conference and Exposition on Experimental and Applied Mechanics, 2016
Contributo
Comitato scientifico
6-9 giugno 2016
Orlando, USA
internazionale
scientifica
Hole drilling; Integrated digital image correlation; Inverse method; Raspberry Pi; Residual stress; Engineering (all); Computational mechanics; Mechanical engineering
no
4 Contributo in Atti di Convegno (Proceeding)::4.1 Contributo in Atti di convegno
Baldi, Antonio; Bertolino, Filippo
273
2
4.1 Contributo in Atti di convegno
reserved
info:eu-repo/semantics/conferencePaper
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