Calibração, validação e otimização de máquina de ensaio de tração sob carga constante para avaliação de susceptibilidade ao hidrogênio em amostras metálicas.

Abstract

This work aimed to perform the calibration, validation and optimization of a prototype equipment for tensile tests under constant load, developed at the Friction and Wear Technology Laboratory. The machine was developed to assess hydrogen embrittlement susceptibility in metallic samples following the guidelines of BS ISO 16573 standard (ISO, 2015). The operating principle of the equipment is the use of dead weights on a lever arm. Before starting the equipment operation, it is necessary to plot mass versus tensile load, and calculate the corresponding uncertainties. In addition, the prototype was reevaluated in order to reduce costs and optimize manufacturing time for the other machines to be built. The main modification carried out was in the load frame of the equipment and the design of the sample grips. Finally, the procedures for calibrating the standard masses and validating the test curve of the prototype equipment were defined, which will help as basis for the other equipment to be manufactured.