This paper presents a micromechanics-based elastoplastic damage model for quasi-brittle rocks in compression stress state. The plastic strain is considered to be related to frictional sliding along microcracks and inherently coupled with damage evolution. By following a homogenization procedure, we first determine the free energy for the matrix-cracks system. The thermodynamic force associated ...

This paper deals with unified elastoplastic and elastic-viscoplastic constitutive equations for metals submitted to large deformations. We present here a newly developed time integration algorithm which is an extension to the viscoplastic range of the classical radial return algorithm for plasticity. The resulting implicit algorithm is both efficient and very inexpensive. This algorithm is also...

Prochilodus lineatus is widely used in pisciculture projects, mainly in the south of Brazil. It shows a basic karyotype composed of 2n = 54 chromosomes, in addition to as many as seven supernumerary chromosomes, also known as B-chromosomes. These additional small chromosomes are frequently heterochromatic, vary in number and morphology, and generally have no homology with the A complement. Inte...

Rowe's stress–dilatancy relation for frictional (cohesion-less) materials has been a cornerstone of soil mechanics. The original derivation of this relationship was based on incorrect energy minimisation considerations, but the relationship was proven later by De Josselin de Jong using friction laws, and has been confirmed by a large body of experimental results. In contrast, the validity of Ro...

Rock failure criteria are key input parameters for models designed to better understand the stability of volcanic rock masses. Cohesion and friction angle two defining material variables Mohr-Coulomb criterion. Although these can be determined from laboratory deformation experiments, they rarely reported. Tabulated data rocks, calculated using published triaxial results, show that cohesion decr...

Whether monetary, environmental, or otherwise, the cost of structure is always an important aspect when designing reinforced concrete. A with a low desirable, but other considerations must be made. First and foremost, structures should safe. The two conditions define structural optimization problem that this paper seeks to solve as finding lowest cost, which also Validation concrete in ultimate...

The non-linear mechanical characteristics of tailings under high pressure are the research foundation large-scale dams. Considering stress caused by tailing ponds, consolidated drained triaxial shear tests were carried out. deterioration mechanism mechanics was revealed particle crushing. test results show that sample density has a great influence on volumetric strain low pressure. However, is ...