Results 121 to 130 of about 408 (144)

Models for prediction of soil precompression stress from readily available soil properties

Geoderma, 2018
Abstract Compaction of the subsoil is an almost irreversible damage to the soil resource. Modern machinery exerts high mechanical stresses to the subsoil, and a range of studies report significant effects on soil functions. There is an urgent need for quantitative knowledge of soil strength in order to evaluate sustainability of current field traffic.
Schjønning, Per; id_orcid 0000-0002-9362-1003, Lamandé, Mathieu; id_orcid 0000-0003-4211-9395   +1 more
openaire   +1 more source

Role of compaction and drying-wetting cycles on the capability of precompression stress to indicate load history of heavily disturbed soils

Geoderma, 2021
Abstract Wetting and drying are common processes in agricultural soils, which change particle rearrangement, cementation and related properties. Some recent studies have noted that soil precompression stress (σp) – the soil capacity to support stress – can be affected by wetting and drying cycles and should be seen as state variable instead of a soil
André Somavilla, Alan Carlos Batistão, Döerthe Holthusen, Rafaella Richter Antunes, Paulo Ivonir Gubiani   +4 more
openaire   +1 more source

Research on Concrete Vertical Precompressive Stress Field at Webs of Box Girder Bridge

Journal of Highway and Transportation Research and Development (English Edition), 2009
Based on Fourier series, an analytic formula for analyzing the prestress in the web of box girder with single bar was deduced through simplifying the action of single vertical prestress bar as a couple of concentrated forces with equal value but opposite direction acting on a thin rectangular board with infinite length.
Mingyan Shen, Xingu Zhong, Xiaojuan Shu
openaire   +1 more source

Precompression stress in response to water content and bulk density under no-till Oxisols in southern Brazil

Geoderma Regional, 2020
Abstract This study was designed to measure the variation of precompression stress (σp) with initial bulk density and initial water content and to propose pedo-transfer functions to estimate σp for two Brazilian no-till Oxisols. Undisturbed soil cores were randomly sampled (to obtain an as large as possible variation in bulk density) from two soils ...
Edwardo A.S. Mendonça, Renato P. de Lima, Daniel da C. Dantas, Pedro H.D. Batista, Neyde F.B. Giarola, Mário M. Rolim   +5 more
openaire   +1 more source

Relationship of precompression stress with elasticity and plasticity indexes from uniaxial cyclic loading test

Soil and Tillage Research, 2018
Abstract The precompression stress (σ p ) has been considered as the soil load bearing capacity, because σ p theoretically separates predominantly elastic (loads lower than σ p ) from predominantly plastic (loads greater than σ p ) deformations.
Paulo Ivonir Gubiani, Patricia Pértile, José Miguel Reichert   +2 more
openaire   +1 more source

Current limitations and future research needs for predicting soil precompression stress: A synthesis of available data [PDF]

Soil and Tillage Research
Precompression stress, compression index, and swelling index are used for characterizing the compressive behavior of soils, and are essential soil properties for establishing decision support tools to reduce the risk of soil compaction. Because measurements are time-consuming, soil compressive properties are often derived through pedotransfer functions.
Loraine Ten Damme, Thomas Keller
exaly   +4 more sources

Soil precompression stress assessed from linear scale stress and strain

The seemingly never-ending increase in the size and hence weight of agricultural machinery induces an urgent need for tools to evaluate the risk of subsoil compaction. The scientific community is fully aware of this as witnessed by a large number of papers addressing soil strength across soil textures, drainage conditions and other drivers of the ...
Mathieu Lamandé, Per Schjønning, Michael Koppelgaard, Emmanuel Arthur   +3 more
openaire   +1 more source

Stress corrosion cracking of Al-Mg-Zn-Cu alloys after precompression

Journal of Materials Science, 1981
Stress corrosion cracking (SCC) experiments have been carried out on double-cantilever-beam (DCB) specimens of 7017-T651 aluminium alloy. The specimens were first subjected to a known compressive load which caused plastic deformation at the notch tip.
openaire   +1 more source

Fatigue Life Prediction by a Local Stress-Strain Criterion for Hole-Containing Specimens After Precompression of Their Material

Strength of Materials, 2019
The fatigue life prediction method for structure elements with the material precompression in the hole vicinity is proposed. The method is a further step in evolving the approach to life prediction from a local stress-strain state that is based on the energy criterion of fatigue fracture.
P. A. Fomichev, A. V. Zarutskii
openaire   +1 more source

Non-linear finite element analysis of cone penetration in layered sandy loam soil – Considering precompression stress state

Journal of Terramechanics, 2009
Abstract Axisymmetric finite element (FE) method was developed to simulate cone penetration process in layered granular soil. The FE was modeled using ABAQUS/Explicit, a commercially available package. Soil was considered as a non-linear elastic plastic material which was modeled using variable elastic parameters of Young’s Modulus and Poisson’s ...
null M.Z. Tekeste, null E.W. Tollner, null R.L. Raper, null T.R. Way, null C.E. Johnson   +4 more
openaire   +1 more source