| COMPLEX STRESS DISTRIBUTIONS IN ENGINEERING MATERIALS. 407 
dl 
TABLE IV. 
ALTERNATING TORSION. Sotrp AND HoLLow SPECIMENS. 
This table gives the ultimate ranges of stress at the skin calculated on the assump- 
tion that the stress has a distribution, throughout specimen, as shown in fig. 13. 
) Specimen | Ultimate Range of Stress at Skin 
Sa Pile | 
| | Tons per sq. in. 
hollow 3D Lis Mean value = 6-14 
i). 5 = 2 +6-27 tons per sq. in. 
Ae, 8 So | +6-35 
Ss | 
o . g, | Ultimate range of stress at skin calculated 
sls tb 
= s for various values of 5 ct 
° SS | for for for for for 
QS Cz ‘ C’ Cs 4 
of |guils bes 21 | = -25 | @ =-30 c= 4 
A7 solid 2 | £6-14 | +6-21 [/ +6-30 | +6-40 | +6-63 | 
© | 
3-4 hollow -O SS > | +8-91 | +8-94 | 49-00 | +9-07 | 49-17 
ae Orog Sr | ~s.68 | ~ 8-70 | 8-77 | ~ 8-84 | ~ 8-98 
0-1 solid miese" | 8-34] 8-40] 8-54) 8-67 | 8°90 | 
12 ,, ) cod a 8-80 | 8-85 | 8-96| 9-09 | 9-34) 
A (stress) 
A (strain) 
+ Obtained from graphs of fig. 17B. 
{ For method of calculation, see Appendix I. 
* C = elastic modulus. C’ = for extra elastic conditions. 
TABLE V. 
ALTERNATING TORSION. SoxLtp Specimens at ULTIMATE RANGE OF STRESS. 
Distribution of stress as shown in fig. 18. 
Stress at R (fig. 18), where modulus changes, for various values of rt 
Stress at R, 
Specimen. Elastic 
oa . . * | 
(See also Table IV.) Limit rag Rein | exe for eee 
\C’=-18C|C’= -21C C’= -25C\C’= -30C| C’= - 40 
| ee] 
‘Tons per Tons per|Tons per | 
| sq. in. sq. in. | sq. in. | sq. in. | sq.in. | sq. in. 
A7 0-12% C (broken) | +5-30 +5-15 |+5-08 |+4-92 |+4-66 |+4-08 
| 
\Tons per Tons per Tons per 
O1 0-35 % C(unbroken)} 7-00 | 7-33 | 7-20 | 7-06 | 6-82 | 6-17 
1-2 »» (broken) 7:00 | 7:80 | 7-65 | 7-48 | 7-25 | 6-63 
} 
* Under alternating torsion. 
