The resilient modulus (MR) of subgrade soils is usually used to characterize the stiffness and a crucial parameter in pavement design. In order determine compacted quickly accurately, an optimized artificial neural network (ANN) approach based on multi-population genetic algorithm (MPGA) was proposed this study. MPGA overcomes problems traditional ANN such as low efficiency, local optimum over-...

Spectral databases of crystal plasticity solutions stored as discrete Fourier transforms (DFTs) have now been used for over a decade to speed-up the simulations. These approaches demonstrated impressive computational advantages conventional numerical that explicitly solve governing constitutive equations. However, their implementation in finite element models (FEM) referred spectral method (SCP...

Although the e.risting tria.rial tests and colif/lled ullia.rial-straill compression tests achieve lugh pressures, ther ("IIlll/ot achieve Idrge shear strains or deviatoric normal strains that are observed In some types qf (oUapse r:f structures cauSPii hy missile impact, e.rplosiolls, and earthquakes, or in e.[plos/ve tnjprtion (fane/lOTS. A new ~'1)(' of ,oncrete test, called the tubp-squash ...

The Cosserat continuum is used in this paper to regularize the ill-posed governing equations of Cauchy/Maxwell continuum. Most available constitutive models adopt yield and plastic potential surfaces with a circular deviatoric section. This too crude an approximation which hinders application into practice, particularly geotechnical domain. An elasto-plastic model for linear formulation here pr...

Abstract In this contribution, a finite element implementation of the stress gradient theory is proposed. The relies on reformulation governing set partial differential equations in terms one primary tensor-valued field variable third order, so-called generalised displacement field. Whereas volumetric part closely related to classic field, deviatoric can be interpreted micro-displacements. asso...

The devastation caused by the illegal dumping and burning of tires has been staggering. In civil engineering, using engineering properties become a major concern. For this investigation, research used locally sourced tire chips sand. Using sand as an alternative backfill material requires less pressure more improved than traditional backfill. Four specimens were utilized in experiment: pure mix...

The main goal of this research is to study the failure behavior cement-fiber-treated sand under triaxial direct tension condition tests. Thus, a new loading system and cell was designed built for tensile loading. Samples were prepared with content cement 3 5% (dry wt.) sand, while two types polypropylene fibers 0.024 m in length 23 μm 300 thick added at 0.0% 0.5% mixture. After seven-day curing...

In this paper, we shall formulate a new micro-mechanical model for describing both local and macroscopic elastic–plastic behavior of porous rocks with pressure-sensitive tension–compression asymmetric solid matrix. For purpose, incremental variational mean field homogenization (IVMFH) method is first established. The novelty lies in the fact that formulation allows considering matrix obeying no...

The use of high strength steel (HSS) cold-formed hollow section is significant interest in the construction sector due to competitive costs. accurate simulation ductile fracture failure at micro and macro scale critical for improving validity predicting structural behaviour HSS sections welded joints. In this study, S700 material studied using Gurson-Tvergaard-Needleman (GTN) damage model. Repr...

S U M M A R Y We present a unified continuum mechanics representation of the mechanisms believed to be commonly involved in post-seismic transients such as viscoelasticity, fault creep and poroelasticity. The time-dependent relaxation that follows an earthquake, or any other static stress perturbation, is considered in a framework of a generalized viscoelastoplastic rheology whereby some inelas...