. Automotive industries . mined howthe impact varies with the speed, weight and tire equip-ment of a vehicle and with the relation between sprungand unsprung load. Another series of experiments wasto determine the ability of road slabs of different mate-rials and thickness to withstand such impacts, and final-ly the effect of the subgrade was to be investigated. In the impact determination tests the rear wheel of aloaded truck is allowed to deliver its blow to the plungerof an hydraulic jack buried beneath the road. In some of the tests thetruck wheel is al-lowed to drop offthe end of a
. Automotive industries . mined howthe impact varies with the speed, weight and tire equip-ment of a vehicle and with the relation between sprungand unsprung load. Another series of experiments wasto determine the ability of road slabs of different mate-rials and thickness to withstand such impacts, and final-ly the effect of the subgrade was to be investigated. In the impact determination tests the rear wheel of aloaded truck is allowed to deliver its blow to the plungerof an hydraulic jack buried beneath the road. In some of the tests thetruck wheel is al-lowed to drop offthe end of a directly ontothe jack and in oth-ers it is driven overan obstruction inthe form of a squaresectional bar lyingdirectly over thejack. The force ofthe blow is trans-mitted to a pre-pared copper cylin-der, the deforma-tion of which is ameasure of the in-tensity of the subjecting the vietvs of impart testing arrangement,cylinder in observers hand Note copper April 21, 1921 AUTOMOTIVE INDUSTRIES THE AUTOMOBILE 849. Figs. 3 and 4—The two methods of making impact tests (drop test and obstruction test) copper cylinder to successively increasing pressures ina testing machine and taking note of correspondingpressures and deformations, it is possible to effect acalibration. It is realized that this method does notgive the force of the blow in absolute terms but itserves well as a practical method of comparison. Theharder the blow, the greater will be the deformationand it stands to reason that the blow causing thegreatest deformation of the copper cylinder would alsohave the most destructive effect on a road slab. and 2 herewith show the hydraulic jack as buried inthe road, the plunger being carried by a section ofchannel steel flush with the road surface. The ob-server holds in his hand the small copper cylinder onwhich the force of the impact is spent. Several thousand impact tests with this apparatushave been made to date. It is obvious that the impactmust depend
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
