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 ...

Accurate joint models require the ability to predict soft tissue behavior. This study evaluates the ability of constitutive equations to predict the nonlinear and viscoelastic behavior of tendon and ligament during stress relaxation testing in a porcine model. Three constitutive equations are compared in their ability to model relaxation, recovery and reloading of tissues. Quasi-linear viscoela...

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...

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...

This study is dedicated to the development of a generalized confinement model applicable circular concrete columns confined by FRP full and partial arrangements. To simulate axial stress versus strain curve, new strength proposed addressing relation pressure during loading , whose calibration was based on an extensive set test results. By combining theoretical basis experimental observations, i...

abstractin this paper, we investigate effect of fe–intermetallic compounds on plastic deformation of closed-cell composite aluminum foam as filler of thin-walled tubes. however, deformation of the aluminum foam-filled thin-walled tubes as crushed-box will be presented in part (ii). composite foams of alsi7sic3 and alsi7sic3-(fe) as closed cell were synthesized by powder metallurgy foaming metho...