Journal . implies that for a given ball the work-done displaced is constant, but at least in the case of mild steel(the only results which the author has examined), given atp. 351 of the paper by Edwards and Willis, this does not seemto be the case, as the following table (taken partly from thepaper cited, and the deductions calculated by means of equation(19) ) shows :— Weightin pounds. Drop in inches. Diameter of indentation in mm. Work-done in per c. mm. displaced. 7777 201510 5 4-S44-444-043-36 11-42 A 12-28A13-32k9-83 k where k 24 THE PHYSICAL PROPERTIES OF CLAY. 37 Furthe
Journal . implies that for a given ball the work-done displaced is constant, but at least in the case of mild steel(the only results which the author has examined), given atp. 351 of the paper by Edwards and Willis, this does not seemto be the case, as the following table (taken partly from thepaper cited, and the deductions calculated by means of equation(19) ) shows :— Weightin pounds. Drop in inches. Diameter of indentation in mm. Work-done in per c. mm. displaced. 7777 201510 5 4-S44-444-043-36 11-42 A 12-28A13-32k9-83 k where k 24 THE PHYSICAL PROPERTIES OF CLAY. 37 Further Agreement of the Laws for Metals and Clay. Chapter XVIII., p. 267-295, Vol 1 of Mechanical Testing,by Batson and Hyde (Chapman & Hall, 1922) is on Hardnessand Abrasion Tests. At p. 269 it is stated that Foeppl found that for metals thesurface of indentation was proportional to the pressure is Conclusion No. 1 of p. 78 of the authors first paper. PRE55URE OF FLUIDITY mo TENACITY Of OflY. Tenacity Grams a cm 100 EOO $00 40O soi Set XXXV. At p. 272 it is recorded that Meyer found that the mean pres-sure per unit area is constant for a given angle of indentationwhatever the diameter of the ball. The law for clay (I., p. 55)is the same. At p. 273 it is said in connection with the Brinell test that the 38 THE PHYSICAL PROPERTIES OF CLAY. time effect is most marked up to about 10 seconds applicationof the load, but after that the effect is very small. In the caseof clay the author found 10 minutes was the time necessaryfor the penetrating body to come practically to rest (I., p. 103,penultimate par.). At p. 274 we learn that numerous named observers haveshown there is a close relationship between the Brinell HardnessNumber and the ultimate tensile strength of a material. Thecurve forming Set XXXV. at p. 37 hereof connects the valuesof the pressure of fluidity and the tensile strength of clay asrecorded in the authors papers I. and II. At p. 285 we find that Martel fou
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