Stress-Displacement Relations and Terrain-Vehicle Mechanics: A Critical Discussion
Current theoretical concepts of the soil-running gear interaction are based on empirical pressure-sinkage and shear stress-displacement relations. It was found that the tests from which these relations were obtained present a poor analogy, at best, to the soil-running gear interaction. In particular...
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ftdtic:ADA040177 2023-05-15T16:37:56+02:00 Stress-Displacement Relations and Terrain-Vehicle Mechanics: A Critical Discussion Wiendieck, Klaus W ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS 1968-12 text/html http://www.dtic.mil/docs/citations/ADA040177 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA040177 en eng http://www.dtic.mil/docs/citations/ADA040177 Approved for public release; distribution is unlimited. Document partially illegible. DTIC AND NTIS Snow Ice and Permafrost *SOIL MECHANICS *TRAFFICABILITY ELASTIC PROPERTIES INTERACTIONS PLASTIC PROPERTIES REPRINTS SHEAR STRESSES STRESS STRAIN RELATIONS TERRAIN VEHICLE CHASSIS COMPONENTS WHEELS Text 1968 ftdtic 2016-02-24T15:37:27Z Current theoretical concepts of the soil-running gear interaction are based on empirical pressure-sinkage and shear stress-displacement relations. It was found that the tests from which these relations were obtained present a poor analogy, at best, to the soil-running gear interaction. In particular, the use of the shear stress-displacement relation for an analytical evaluation of the shear stresses at the contact surface of rigid wheels on sand was found to be misleading, primarily because equations obtained by the bevameter or dragged plate tests describe the soil behavior in the intermediate state, which is a state between the elastic and plastic states. Recent publications point out that part of the soil in the immediate vicinity of a powered wheel is in a state of actual plastic flow and part is in a quasielastic state. Thus, the soil- bevameter interaction is of a fundamentally different nature than the soil-wheel interaction, which makes results of such tests unsuitable for predicting wheel performance. Sela's theory of the relation between a rigid wheel and dry sand is based exclusively on the shear stress-displacement concept, and thus provided an excellent means of checking the concept as a whole. Using a simple approximate relation between the M/RW ratio and the mean shear-to-normal stress ratio taken over the total contact surface, the theory was checked by means of constant-slip rigid wheel tests. The experimental findings strongly supported the conclusion that shear stress-displacement relations are irrelevant to soil-wheel mechanics. A new theory was developed to assess the variation of the shear-to-normal stress ratio along the soil-wheel interface, without referring to shear stress- displacement relations. Availability: Pub. in Jnl. of Terramechanics v5 n3 p67-85 1968. Text Ice permafrost Defense Technical Information Center: DTIC Technical Reports database |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Snow Ice and Permafrost *SOIL MECHANICS *TRAFFICABILITY ELASTIC PROPERTIES INTERACTIONS PLASTIC PROPERTIES REPRINTS SHEAR STRESSES STRESS STRAIN RELATIONS TERRAIN VEHICLE CHASSIS COMPONENTS WHEELS |
spellingShingle |
Snow Ice and Permafrost *SOIL MECHANICS *TRAFFICABILITY ELASTIC PROPERTIES INTERACTIONS PLASTIC PROPERTIES REPRINTS SHEAR STRESSES STRESS STRAIN RELATIONS TERRAIN VEHICLE CHASSIS COMPONENTS WHEELS Wiendieck, Klaus W Stress-Displacement Relations and Terrain-Vehicle Mechanics: A Critical Discussion |
topic_facet |
Snow Ice and Permafrost *SOIL MECHANICS *TRAFFICABILITY ELASTIC PROPERTIES INTERACTIONS PLASTIC PROPERTIES REPRINTS SHEAR STRESSES STRESS STRAIN RELATIONS TERRAIN VEHICLE CHASSIS COMPONENTS WHEELS |
description |
Current theoretical concepts of the soil-running gear interaction are based on empirical pressure-sinkage and shear stress-displacement relations. It was found that the tests from which these relations were obtained present a poor analogy, at best, to the soil-running gear interaction. In particular, the use of the shear stress-displacement relation for an analytical evaluation of the shear stresses at the contact surface of rigid wheels on sand was found to be misleading, primarily because equations obtained by the bevameter or dragged plate tests describe the soil behavior in the intermediate state, which is a state between the elastic and plastic states. Recent publications point out that part of the soil in the immediate vicinity of a powered wheel is in a state of actual plastic flow and part is in a quasielastic state. Thus, the soil- bevameter interaction is of a fundamentally different nature than the soil-wheel interaction, which makes results of such tests unsuitable for predicting wheel performance. Sela's theory of the relation between a rigid wheel and dry sand is based exclusively on the shear stress-displacement concept, and thus provided an excellent means of checking the concept as a whole. Using a simple approximate relation between the M/RW ratio and the mean shear-to-normal stress ratio taken over the total contact surface, the theory was checked by means of constant-slip rigid wheel tests. The experimental findings strongly supported the conclusion that shear stress-displacement relations are irrelevant to soil-wheel mechanics. A new theory was developed to assess the variation of the shear-to-normal stress ratio along the soil-wheel interface, without referring to shear stress- displacement relations. Availability: Pub. in Jnl. of Terramechanics v5 n3 p67-85 1968. |
author2 |
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS |
format |
Text |
author |
Wiendieck, Klaus W |
author_facet |
Wiendieck, Klaus W |
author_sort |
Wiendieck, Klaus W |
title |
Stress-Displacement Relations and Terrain-Vehicle Mechanics: A Critical Discussion |
title_short |
Stress-Displacement Relations and Terrain-Vehicle Mechanics: A Critical Discussion |
title_full |
Stress-Displacement Relations and Terrain-Vehicle Mechanics: A Critical Discussion |
title_fullStr |
Stress-Displacement Relations and Terrain-Vehicle Mechanics: A Critical Discussion |
title_full_unstemmed |
Stress-Displacement Relations and Terrain-Vehicle Mechanics: A Critical Discussion |
title_sort |
stress-displacement relations and terrain-vehicle mechanics: a critical discussion |
publishDate |
1968 |
url |
http://www.dtic.mil/docs/citations/ADA040177 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA040177 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA040177 |
op_rights |
Approved for public release; distribution is unlimited. Document partially illegible. |
_version_ |
1766028231169802240 |