Derivation of ductile fracture resistance by use of small punch specimens

Effect of geometric factors and processing parameters on plastic damage of SUS304 stainless steel by small punch test

“…3. It is noteworthy that the L-D curves from experiment and simulation both have four typical stages [29,30], which proves that FEM established in this paper is valid. At low-load region, the curves are almost entirely overlapped, the fine difference between the experimental and simulation curves is probably induced by the initial slight misalignment of the whole experiment.…”

Estimation of Ductile Fracture Behavior Incorporating Material Anisotropy

“…With respect to the crack front mesh, as shown in the enlarged part of the figure, refined square elements were generated as the same size with those of SP specimen. Crack extension was identified as the size of the damage zone where the void volume fraction extended to the fracture void volume fraction due to its growth [4]. Two elastic-plastic FE analyses employing both the isotropic damage parameters and anisotropic ones summarized in Table 6 were performed based on the deformation plasticity theory.…”

“…In the previous work by the authors [4], SP tests and subsequent FE(Finite Element) analyses were carried out to determine GTN damage parameters by using a trial and error method. However, a lot of time consuming effort was devoted to the calibration of damage parameters.…”

Damage modeling in Small Punch Test specimens

“…It therefore comes as no surprise that efforts to characterize the initiation and subsequent propagation of cracks in SPT specimens have mostly employed models that account for the nucleation, growth and coalescence of microvoids (see, e.g., [8,9,11,12,18] and references therein). The model by Gurson [19], later extended by Tvergaard and Needleman [20], is by far the most frequent choice, but other models -such as the one by Rousselier [21] -have also been employed [9]. These models are able to quantitatively capture the experimental results by fitting several parameters that account for the ductile damage mechanisms taking place.…”

“…The aforementioned testing methodology, commonly known as Small Punch Test (SPT), employs very small specimens (generally, 8 mm diameter and 0.5 mm thickness) and may be considered as a non-destructive experiment. The SPT has consistently proven to be a reliable tool for estimating the mechanical [2,3] and creep [4,5] properties of metallic materials and its promising capabilities in fracture and damage characterization have attracted great interest in recent years (see, e.g., [6][7][8][9][10][11][12][14][15][16][17][18]). …”