Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
A METROLOGICAL CONTRIBUTION TO THE MEASUREMENT OF LATERAL EXPANSION IN CHARPY TESTS
Submission Author:
Guilherme Henrique Alves Andrade , MG
Co-Authors:
Rodrigo Freitas da Silva Alvarenga, Guilherme Henrique Alves Andrade, João Pedro Cândido José , Rosenda Arencibia, Daniel Correia Freire Ferreira, Luciano José Arantes
Presenter: Luciano José Arantes
doi://10.26678/ABCM.COBEM2023.COB2023-2413
Abstract
This paper proposes a measurement system based on an analog dial indicator for the lateral expansion measurement. This measurement system was used to measure the expansion of nine reference test specimens (10 x 10 x 55 mm3) provided by the National Institute of Standards and Technology (NIST) at three energy levels (low, high, and super-high). For each condition, three test specimens were tested using a Charpy 450HIT from Zwick Roell impact machine (8 mm radius striker). Additionally, the effect of the measurement method factor was investigated based on a single factor design. The measurement method factor was investigated on two levels (-1) ASTM method and (1) alternative method (AM), probing opposite points in the test specimen. The Mann-Whitney U test showed that the measurement method factor caused statistically significant effects on the lateral expansion values for five of the nine considered test specimens. The proposed measurement system proved to be simple and feasible. It allows for the acquisition of lateral expansion values with excellent quality. For the worst condition, test specimen 2 at the low energy level (S12), an expanded uncertainty value less than 5.0 % was observed considering the three measurements performed.
Keywords
Lateral expansion, Charpy impact test, ASTM E23, Measurement uncertainty
