COMPLEX STRESS DISTRIBUTIONS IN ENGINEERING MATERIALS. 183 
73 Cook, G. 1911 The Strength of Thick Hollow Cylinders under Internal 
Robertson, A. Pressure. ‘ Engineering,’ 92, Dec. 15, 1911. 
74 Bridgman, P. W. 1912 The Collapse of Thick Cylinders under High Hydro- 
static Pressure. ‘ Phys. Rev.,’ 34, Jan. 1912. 
15 1912 Breaking Tests under Hydrostatic Pressure and Con- 
ditions of Rupture. ‘ Phil. Mag.,’ July 1912. 
76 Basquin,O. H. 1912 The Circular Diagram of Stress and its Application to 
1913 the Theory of Internal Friction. ‘ West Soc. Eng. 
Journ., 17, Nov. 1912, ‘Sci. Abs.,’ Feb. 1913, 
No. 149. 
77 Mallock, A. 1912 Some Unclassified Properties of Solid: and Liquids. 
“Proc. Roy. Soc. A.,’ Dec. 1912. 
78 Mallock, A. The Extension of Cracks in an Isotropic Substance. 
“Proc. Roy. Soc.,’ A, vol. 82, pp. 26-29. 
79 1912 The Yield Point and the Elastic Limit. ‘ Engineer- 
ing,’ Jan. 26, 1912. Definitions by the Engineering 
Standards Committee and Recommendation of the 
Ships Committee. 
80 Report on ‘Theories and History.’ Also Applied 
Mechanics, Perry. 
Report on Alternating Stress. By W. Mason, M.Sc., with Notes by 
F. Rogers, D.Eng., and E. M. Even. 
INDEX. 
PAGH 
Introductory . : i : : : : : : : ; : : : - 183 
Mestine Machines sy 2. ox ho es i pmal. fry Sher pin 184 
Data from Published Tests . . . . . . . at w ad Le Tih eh eee 84 
ieaoschinger’s. Theory ... .  . «. «5 «= «. + Se he Ne oe Os we OL 
Recovery of Elasticity . Joy ERGARMNS Qiagen Ad ein), oe! COG 
PNeRICEEySstoresIS COS era easter iives teary ter EY) 
PreDripiiticctrr.s es RATE Th USFS 1 ot 190 
Divergent Results of Fatigue Tests . . 190 
Carbon-Content of Steels and Resistance to Alternating Sivesaans 4g leh Sto 
Effects of Annealing and Quenching upon Resistance to Alternating Stress . 191 
Tests with Repeated Cycles of Combined Stresses . . . . . . . 192 
Alternate Stress with Repeated Impact . . . . . . . . . 192 
Practical Utility of the Alternate Stress Test. . . . . . . . 192 
Rapid Means of determining Endurance under Stress Repetition . ay Reger cel Lt) 
Materials other than Wrought Iron and Steel. . ©. . . . .  . 193 
Pugpestions for Research . . « . .  . 193 
Note by Dr. F. Rogers on Heat Treatment . . 194 
Note by Dr. F. Rogers on Microscopic Effects of Alternating Stress . . 195 
Remarks on the Phrase ‘ Crystallisation through Fatigue’ ‘i ‘ see 2 L9G 
Note by Mr. E. M. Eden on Stress Alternation Curves for Bending Tests on 
Rotating Bars i. 5 sec wks Rt alten bars sh bags enh ately fon LOC 
Note by Mr. E. M. Eden on Divergent Results of Alternating Stress Tests . 197 
AppEnpIx I. Review of recent Papers on Elastic Hysteresis ‘aett «aon LOS 
BeeMNDix, II. Table of certain Data.  . . . . . . «ss. 200 
Introductory. 
By an ‘alternating stress * is meant a stress varying cyclically between 
maximum and minimum values. Unless otherwise stated, it 1s implied 
that the stresses are imposed without shock, and that the variation of 
stress on either side of the algebraic mean of the maximum and minimum 
stresses is, or is approximately, simple-harmonic. The range of stress is 
the algebraic difference between the maximum and minimum stresses. 
The resistance of a material to alternating stress may be measured by 
_ the values of the maximum and minimum stresses of the cycle whose 
