Using Small Punch tests in environment under static load for fracture toughness estimation in hydrogen embrittlement

4th International Conference on Mechanical, Materials and Manufacturing

材料科学;机械制造

Arroyo, B.^1 ; Álvarez, J.A.^1 ; Lacalle, R.^1,2 ; González, P.^1 ; Gutiérrez-Solana, F.^1

LADCIM, University of Cantabria, Avda. Los Castros 44, Santander

39005, Spain^1

INESCO INGENIEROS, CDTUC Module, 009A phase B, Santander

39005, Spain^2

关键词: Good correlations;    Non-destructive test;    Notched specimens;    Precracked specimens;    Small punch test;    Standard tests;    Static loads;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/272/1/012033/pdf
DOI  :  10.1088/1757-899X/272/1/012033

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this paper, the response of three medium and high-strength steels to hydrogen embrittlement is analyzed by means of the quasi-non-destructive test known as the Small Punch Test (SPT). SPT tests on notched specimens under static load are carried out, applying Lacaclle's methodology to estimate the fracture toughness for crack initiation, comparing the results to KIEACfracture toughness obtained from C(T) precracked specimens tested in the same environment; SPT showed good correlation to standard tests. A novel expression was proposed to define the parameter KIEAC-SPas the suitable one to estimate the fracture toughness for crack initiation in hydrogen embrittlement conditions by Small Punch means, obtaining good accuracy in its estimations. Finally, Slow Rate Small Punch Tests (SRSPT) are proposed as a more efficient alternative, introducing an order of magnitude for the adequate rate to be employed.