The ‘size effect’ on the stress–strain, fatigue and fracture properties of thin metallic foils

A three-dimensional dislocation field crystal plasticity approach applied to miniaturized structures

“…Empirical and numerical evidences suggest that smaller is stronger, however, this neglects contributions due to the weakening influence of reduced crystallographic constraints as the number of grains within the component are reduced as in the case of micromanufactured components. This subject was advocated experimentally in [19,20,21,22], and justifies an analysis in the considered range of length scales. Using a 3D second-order strain gradient crystal plasticity approach, this paper examines the qualitative relevance and competitive influence between gradient strengthening and weakening, under imposed uniaxial tension and bending with 'large' grains and specimen dimensions in the range of 100 µm to 1 mm.…”

Scattering in Fatigue Crack Growth of Thin Pure Copper Sheet for Smart Stress Memory Patch

“…Furthermore, there were few studies about fatigue crack growth behavior of thin metallic sheet with thickness of a few hundred micrometer such as this patch. Klein and Hadrboletz et al 10,11) studied fatigue crack growth behavior of thin metallic foils with thickness ranging from 20 to 250 mm and reported that the crack arrest was observed due to the stress state of crack tip which is determined by the plastic zone size and the thickness.…”

Investigation of micro-structure and mechanical properties of three steel alloys

“…A diameter of 6 mm and 30 mm gauge length (L/D ratio is 5) with 64 mm of total length for carbon steel, 5.7 mm gauge diameter, gauge length of 30 mm for mild steel alloys, and a specimen for gauge diameter 5.8 mm and gauge length of 33 mm with total length of 67 mm for EN 8 steel alloys were used for the experimental analysis. Researchers did experimental analysis on Cu, Al, Au, and Ni foils with a thickness less than 250 µm and it has been observed that yield strength increased while tensile strength decreased by the decreasing thickness of foil [29,30]. Figure 1 shows the experimental setup for tensile test on UTM of each specimen and fractured specimens after the test.…”