The simulation of the hydro-mechanical behavior of unsaturated soils is becoming a subject of major importance in soil mechanics. However, unlike the laws governing the behavior of saturated soils, those used to describe the behavior of unsaturated soils still lack of simplicity for common engineering practice. This is why it is important to reconcile saturated and unsaturated soil mechanics and establish a unified theory. In this paper, we use the same strength equation of saturated soils in unsaturated materials and verify that a single failure surface is obtained for any value of suction in wetting and drying paths.
WlToLD BRolToW|2'' VIcToR M. cASTAŃol'2'';alv t Honte]', GoNZALo MARTINEZ-BłRRERł1 a)') and thermal properties of SBR-toughened polystyrene summaIy' Effects of chemical structurą composition, thelma] stability and mo1eĆular wei8hts of ihe rubber Phase in amorphous Polystyrene + siy_ rene/butadiene rubber (SBR) blends on impact behavior were investigated. Blends v/ith 5, 10 and 13 \r'r't' % of sBR embedded into a ńsid polysi}Tene matrix were prepared as well as the samples without SBR. For all blends the Izod impact tests were pe omed and those with ihe besi impact strength values were submiited to gamma inadiatior The lzod impact tesis of the inadiated sańPles \Ą'ele ihen Perfolmed' Themo8ravimetfic analysis (TGA) and differential scanning calorimeEy @SC) runs were made for both irra diated and noi inadiated blends. Blends compositions with the highest impaci energies have been defined. Gamma irradiation initially enhances the impdci ellerSies but rhen rea,hes a mr\imum around 150 kcy above Bhi.h the impact shength eventually becomes lower than in the samples noi subje.led Lo rrradi",ron.
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