Experimental and Numerical Small Punch Tests of the 14Cr ODS Ferritic Steel

Abstract

Nowadays, various small specimen test techniques have gained wide popularity and appreciation among researchers as they offer undoubtful benefits in terms of structural material characterisation. This paper focuses on small punch tests (SPTs) performed on small-sized disc specimens to assess the mechanical properties of 14Cr oxide dispersion strengthened (ODS) steel. A numerical model was established to support experimental data and gain deeper insight into complex strain states developing in a deformed specimen. Modern evaluation procedures were discussed for obtaining mechanical properties from the small punch force-deflection response and were compared with the literature. Applicability and universality of those relations at different test conditions were also studied. It appeared that different ball diameters used had negligible influence on yield point but strongly affected ultimate strength estimation. It was found that friction belongs to decisive factors determining strain distribution in samples, as dry conditions increase the peak strain and move its location farther from the punch pole.

Obrót prawny nieruchomościami w Krakowie i podkrakowskim Kazimierzu w średniowieczu

“…Gdy natomiast nie są regulowane w przywileju, w użyciu jest formułka secundum cursum vel observantiam iuris civilis 1175 . Groicki w formularzach idzie na kompromis i stosuje następujące zwroty: secundum ius civitatis, iuxta loci iudicioque observacionem, cui eiusmodi domus subiacet 1176 .…”

Mechanical Properties Study of Miniature Steel Specimens Based on the Small Punch Test and Simulation Methods

“…As one of the small sample testing techniques (SSTT), the small punch test (SPT) has attracted extensive attention in the field of nuclear and petrochemical industry due to its unique advantages in obtaining material mechanical properties from small volume samples [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. The SPT method, which originated in the early 1980s, was originally developed to test the changes in material properties caused by tempering embrittlement or irradiation embrittlement of in-service nuclear materials [ 1 ].…”

“…The SPT method, which originated in the early 1980s, was originally developed to test the changes in material properties caused by tempering embrittlement or irradiation embrittlement of in-service nuclear materials [ 1 ]. Now it has gradually developed to evaluate the mechanical property parameters of materials such as tensile properties [ 2 , 3 , 4 , 5 ], brittle–ductile transition temperature [ 6 ], fracture toughness [ 7 ], fatigue property [ 8 , 9 , 10 ], and creep properties [ 11 , 12 , 13 ]. In addition, the SPT method is also used to investigate creep crack propagation by some researchers [ 14 , 15 , 16 ].…”