Sistema de baixo custo para nucleação de pré-trincas por fadiga em corpos de prova de tenacidade à fratura

Materials Research

V.a. Guimarães¹  L.r.o. Hein¹  J. Zangrandi Filho¹ 

[1] ,UNESP FEG Departamento de Materiais e TecnologiaGuaratinguetá SP ,Brazil

关键词: fracture toughness;    fracture mechanic;    mechanical testing;   

DOI  :  10.1590/S1516-14392001000300011

来源: SciELO

【 摘 要 】

Fracture toughness testing becomes a very important parameter for mechanical design and maintenance of parts and structures. This work presents the design and construction of a machine device to perform the pre-crack nucleation on SE(B) specimens for fracture toughness testing. Employing this device, it is possible to test materials for K Ic, CTOD and J Ic in a conventional tensile test equipment, assisted by a data acquisition system. The device is based on the concept of loading from an eccentric mechanism, controlling the displacement by means of a marking ring. The main contribution of this work is the low cost technology offered for laboratories, without high priced servo-hydraulic testing machines, giving them autonomy for the execution of fracture toughness tests. The experimental results satisfied the expectation about crack nucleation on SE(B) and applied loading control.

【 授权许可】

CC BY   
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