COMPARISON OF STRAIN AND LOAD OBTAINED VIA STRAIN GAGE BY WIRE AND WIRELESS TRANSMISSIONS

• DOI: 10.22533/at.ed.17321180622

• Palavras-chave: Strain gage, strain and load measurement, wire and wireless transmissions.

• Keywords: Strain gage, strain and load measurement, wire and wireless transmissions.

• Abstract:

  One of the main methods to measure the strain of mechanical components addresses the application of piezoresistive strain gages. However, the design and posterior implementation of the physical infrastructure to perform this measurement induces a certain quantity of relative error when the experimental results are compared to those of the analytic calculation. Aiming at reducing this error, this paper scopes the comparison of strain and load measured via piezoresistive strain gage by wire and wireless transmissions. The structural element which strain and load are obtained refers to a clamped beam made of anodized aluminum alloy subjected to a point load, mainly producing strain from bending. To accomplish this, a piezoresistive strain gage is adhered to the beam surface under tension. In the first experiment, a prototyping platform Arduino® was connected to the strain gage (method with wire). In the second, ESP 32® (wireless) replaced the Arduino®. When the comparison between wire and wireless methods is made, it can be verified that the method with wire provides less relative error between experimental and analytical results. This allows the conclusion that the configuration with wire is more appropriate when more accurate strain and load results are desired.

• Número de páginas: 15