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Soft-soil vehicle mobility
Journal o f Terramechanics, 1971, Vol. 8, No. 2, pp. 87 to 95. Pergamon Press Printed in Great Britain.
ABSTRACTS 18.
K. Akai and M. Hori. Basic study on the dynamic soil-structure interaction (in English). Proc. Japan Soc. Civil Eng. No. 173, 61-78 (1970). Longitudinal impact tests have been performed on a column of clay without and with an embedded cylinder, either flexible (thin-walled metal tube) or rigid (solid aluminium). Pressure gages were installed in the clay circumferentially around the hypothetical or actual cylinder position; strain gages and an accelerometer were attached to the latter to measure the stress field. Attenuation of the stress wave was determined in the continuous clay column both as a function of time near the surface and as a function of distance from the impact point. These data were employed to calculate the stress around a cylindrical inclusion in an infinite medium based on an enveloping plane wave with an amplitude equal to the yield stress of this medium, whose uniaxial constitutive relation was taken as bilinear. The computed values were compared to the stresses measured by the gages with a fair degree of correlation, and the distribution around the two types of cylinders was plotted. Significant differences were noted between the distributions for the two types of cylinders, with relatively small stress levels observed near the central portion. The investigation purports to relate to the failure of soil near the base of structures under earthquake conditions when the surface soil was not disturbed. Reviewer is concerned regarding the postulates of the analysis that involve a simple continuous step loading, a bilinear stressstrain curve with reflection occurring only in the plastic regime, and the absence of any unloading effects or reflections from other boundaries of the system. (App. Mech. Rev.)
19.
Army Test and Evaluation Command. Cross-country mobility. 12 pp. (April 1970). The Army service test procedure describes test methods and techniques for evaluating the capability of a military wheeled or tracked vehicle (combat or logistical type) to traverse crosscountry under various conditions of terrain and weather. (U.S. Gov. Res. Dev. Rep., 25.2.71, AD-871129.)
20.
Army Test and Evaluation Command. Load distribution and ground pressure. 8 pp. (May 1970). The engineering test procedure describes test methods and techniques for determining the load distribution and ground pressure of wheeled and tracked vehicles. The evaluation is related to criteria expressed in applicable qualitative material, requirements, small development requirements, technical characteristics, or other appropriate design requirements and specifications. (U.S. Gov. Res. Dev. Rep., 10.3.71, AD-871926.)
21.
Army Test and Evaluation Command. Soft-soil vehicle mobility. (May 1970). The engineering test procedure describes test methods and techniques for assessing the mobility of wheeled and tracked vehicles in soft-soil (mud, sand, snow, swamps, wet clay, rice paddies). The evaluation is related to criteria expressed in applicable qualitative material requirements, small development requirements, technical characteristics, or other appropriate design requirements and specifications. (U.S. Gov. Res. Dev. Rep., 10.3.71, AD-871765.)
22.
Army Test and Evaluation Command. Tracks. 32 pp. (July 1970). The pamphlet is designed for guidance in testing the performance, endurance, and suitability of tracks and track components and their compliance with applicable specifications. (U.S. Gov. Res. Dev. Rep., 10.3.71, AD-876375.)
23.
Army Test and Evaluation Command. Vehicles, field artillery application. 26 pp. (May 1970). The Army service test procedure describes test methods and techniques for evaluating the performance and characteristics of vehicles with regard to their suitability for service use in Army field artillery roles. (U.S. Gov. Res. Dev. Rep., 10.3.71, AD-871787.) 87
ABSTRACTS 18.
K. Akai and M. Hori. Basic study on the dynamic soil-structure interaction (in English). Proc. Japan Soc. Civil Eng. No. 173, 61-78 (1970). Longitudinal impact tests have been performed on a column of clay without and with an embedded cylinder, either flexible (thin-walled metal tube) or rigid (solid aluminium). Pressure gages were installed in the clay circumferentially around the hypothetical or actual cylinder position; strain gages and an accelerometer were attached to the latter to measure the stress field. Attenuation of the stress wave was determined in the continuous clay column both as a function of time near the surface and as a function of distance from the impact point. These data were employed to calculate the stress around a cylindrical inclusion in an infinite medium based on an enveloping plane wave with an amplitude equal to the yield stress of this medium, whose uniaxial constitutive relation was taken as bilinear. The computed values were compared to the stresses measured by the gages with a fair degree of correlation, and the distribution around the two types of cylinders was plotted. Significant differences were noted between the distributions for the two types of cylinders, with relatively small stress levels observed near the central portion. The investigation purports to relate to the failure of soil near the base of structures under earthquake conditions when the surface soil was not disturbed. Reviewer is concerned regarding the postulates of the analysis that involve a simple continuous step loading, a bilinear stressstrain curve with reflection occurring only in the plastic regime, and the absence of any unloading effects or reflections from other boundaries of the system. (App. Mech. Rev.)
19.
Army Test and Evaluation Command. Cross-country mobility. 12 pp. (April 1970). The Army service test procedure describes test methods and techniques for evaluating the capability of a military wheeled or tracked vehicle (combat or logistical type) to traverse crosscountry under various conditions of terrain and weather. (U.S. Gov. Res. Dev. Rep., 25.2.71, AD-871129.)
20.
Army Test and Evaluation Command. Load distribution and ground pressure. 8 pp. (May 1970). The engineering test procedure describes test methods and techniques for determining the load distribution and ground pressure of wheeled and tracked vehicles. The evaluation is related to criteria expressed in applicable qualitative material, requirements, small development requirements, technical characteristics, or other appropriate design requirements and specifications. (U.S. Gov. Res. Dev. Rep., 10.3.71, AD-871926.)
21.
Army Test and Evaluation Command. Soft-soil vehicle mobility. (May 1970). The engineering test procedure describes test methods and techniques for assessing the mobility of wheeled and tracked vehicles in soft-soil (mud, sand, snow, swamps, wet clay, rice paddies). The evaluation is related to criteria expressed in applicable qualitative material requirements, small development requirements, technical characteristics, or other appropriate design requirements and specifications. (U.S. Gov. Res. Dev. Rep., 10.3.71, AD-871765.)
22.
Army Test and Evaluation Command. Tracks. 32 pp. (July 1970). The pamphlet is designed for guidance in testing the performance, endurance, and suitability of tracks and track components and their compliance with applicable specifications. (U.S. Gov. Res. Dev. Rep., 10.3.71, AD-876375.)
23.
Army Test and Evaluation Command. Vehicles, field artillery application. 26 pp. (May 1970). The Army service test procedure describes test methods and techniques for evaluating the performance and characteristics of vehicles with regard to their suitability for service use in Army field artillery roles. (U.S. Gov. Res. Dev. Rep., 10.3.71, AD-871787.) 87