The exact stress–strain curve can be directly identified from uniaxial tension experiments up to the point of onset diffuse necking. To gain insight into post-necking hardening response metals, other experimental methods such as bulge, compression or torsion are typically employed. Here, we introduce idea using surround DIC obtain accurate specimen shape measurements tensile specimens with rect...

In this paper, a classical problem of the construction of a cubic Hermite G1 continuous spline curve is considered. The only data given are interpolation points, while tangent directions are unknown. They are constructed in such a way that a particular minimization of the strain energy of the spline curve is applied. The resulting spline curve is regular, cusp-, loopand fold-free. Even more, it...

Abstract Brittleness is a crucial parameter of rock mass and the key indicator in engineerings, such as rockburst prediction, tunnelling machine borehole drilling, hydraulic fracturing. To solve problem using present brittleness indexes, existing indexes were firstly summarised this paper. Then, index (BL), which considers ratio stress drop rate increase peak stress, was proposed. This new has ...

This paper reports the development and verification of a new procedure for formation complete stress-strain curve concrete with downward region strain by using digital image correlation method. A technique to build spectle patterns on surface is described. That makes it possible accurately enough reproduce perform high-quality analysis strains involving correlation. The advantages this research...

In this paper, a classical problem of the construction of a cubic G1 continuous interpolatory spline curve is considered. The only data prescribed are interpolation points, while tangent directions are unknown. They are constructed automatically in such a way that a particular minimization of the strain energy of the spline curve is applied. The resulting spline curve is constructed locally and...