The fatigue behavior of materials for the supersonic transport

APPENDIX A TENSILE DATA

APPENDIX A TENSILE DATA O N AM-350 AND Ti-8Al-Mo-1V SHEETS TABLE A-l.

MANUFACTURER’ S DATA O N AM-350 CRT STAINLESS STEEL Material: AM-350 stainless steel, CRT condition Number of Sheets: Three, designated XA5, XA7, XA8 Size of Sheet: 36 x 96 x 0.050 in.

Heat: 55431 Chemical Analysis Element Weight, per cent Mechanical Properties c 0.096 Yield Strength, 183,970 psi Mn 0.75 Tensile Strength, 233,460 psi P 0.015 Elongation, 13. 0 cent per S 0.010 Hardness, 48 R C Si 0.27 Cr 16.64 Ni 4.30 M O 2.79 N2 0.096 TABLE A-2. MANUFACTURER’ S DATA O N Ti-8Al-lMo-1V ALLOY Material: 8Al- 1 M O - 1 V titanium alloy Condition: Triplex annealed 8 hours, 1450 F, furnace cool t5 minutes, 1850 F, air cool t15 minutes, 1375 F, air cool Number of Sheets: Three, designated TA6, TA7, TA8 Size of Sheets: 36 x 96 x (0.038 to 0. 049) inch Chemical Analysis Mechanical Properties Weight, Yield Strength, Tensile Strength, Elongation, Element per cent psi psi per cent C 0. 023 130,300 min 142,300 min 11 min Fe 0.09 141,100 max 152,600 max 16 max N2 0.013 133,000 avg 147,000 avg 13 avg Al 7. 6 Va 1.0 M O 1.1 H2 0.010-0.014

APPENDIX B CRACK-PROPAGATION DATA TABLE B-l. CRACK-PROPAGATION DATA FOR S-INCH WIDE Ti-8A1-lMo-1V ALLOY SHEET SPECIMENS WITH CONSTANT NET-SECTmN STRESS Center-notched. triplex-annealed specimens at a constant net-section mean sttess of 25 ksi.

Total Thousands of Cycles to Indicated Crack Len&a), inch Crack Propagation Rare, pin./cycle, at 0.150 Indicated Crack Len@h(a), inch Condition Specimen 0.250 0.350 0.500 0.625 0.750 0.950 (Initiation) 0.250 0.350 0.500 0.625 0.750 0.950 1.000 FaiIurAb) A I$“)= 0.26, Room Temperature, 1725 cpm, Longitudinal, Unexposed 7335 1.3 2.2 2.8 3.3 4.0 4.0 635 853 915 973 1013 1045 1095 1107 1181 8331 2.9 3.4 3.4 3.4 1080 1229 1291 1349 1385 1422 148 1 1492 1578 1.4 2.2 B 19 = 0.38. Room Temperature, 1725 cpm. Longitudinal, Unexposed 6330 4.2 5.3 8.1 8.1 8.7 8.7 66.0 101 123 146 161 176 199 205 240 6353 4.5 6.2 8.5 8.7 10.4 9.0 59.5 95.5 116 136 151 164 183 189 (4 7327 5.4 7.2 8.8 8.8 8.8 60.2 92.5 113 135 151 164 187 192 228 4.2 mm 8327 4.3 5.3 8.6 8.6 9.6 9.6 53.0 84.0 105 127 141 156 177 181 mm 8332 6.7 8.0 9.6 9.6 9.0 67.2 95.7 116 138 151 165 186 191 4.5 C 8 = 0.38, Room Temperature. 1725 cpm, Transvene, Unexposed __ 7225 4.3 4.9 7.2 8.3 9.2 9.2 17.3 119 142 165 180 195 217 222 7351 4.5 88.0 127 149 172 190 207 232 269 4.5 6.7 7.8 7.8 8.3 236 7352 3.6 4.5 5.8 8.0 8.0 8.0 103 151 179 206 224 239 264 271 312 mm 8230 5.8 7.4 77.9 119 143 169 3.7 4.8 7.4 8.0 189 206 230 236 D 0 = 0.38. 550 F. 1725 cpm, Longitudinal, Unexposed 3.0 3.8 4.6 5.5 5.2 5.2 57.3 109 139 175 199 223 264 333 3.8 4.0 4.9 5.5 6.1 5.3 57.5 90.2 117 149 174 195 229 239 298 E 0 = 0.74, -110 F. 1725 cpm. Longitudinal, Unexposed 6356 23 23 38 38 42 42 8.6 14.7 19.1 24.7 28.0 31.4 36.2 37.4 45.9.

7341 20 24 34 34 34 34 11.1 17.6 22.0 27.5 31.1 34.8 40.1 41.1 50.7 -- mm 8162 21 26 35 35 35 -- 8.3 15.3 19.5 24.8 28.4 31.9 -- -_ 24 35 35 35 -- 15.3 19.4 8174 22 8.8 24.8 28.4 32.0 -- -- - F 0 = 0.74, Room Temperature, 34 cpm, Longitudmal. Unexposed 6339 24 28 35 39 39 39 6.0 11.7 15.7 20.3 23.7 26.9 32.0 32.9 39.4 7334 19 29 34 38 38 38 5.5 11.9 16.2 21.3 24.8 28.2 33.4 42.6 34.7 -- -- 7343 24 28 34 40 40 -- 7.8 12.9 17.1 21.9 25.4 28.5 --.

8163 23 -- -_ 26 33 36 36 -- 6.5 12.4 16. I 21.8 25.4 28.9 -- G 0 = 0.74, Room Temperature, 1725 cpm, Longitudinal, Unexposed 6331 18 24 29 31 31 31 7.2 14.1 19.3 25.4 29.6 31.8 40.2 41.5 50.0 -- __ 6335 19 23 28 31 31 -- 7.5 14.3 19.4 25.3 29.7 33.7 -- m m -- 6337 19 23 28 30 30 -- 13.9 18.8 24.7 28.8 32.9 -- 6.9 7328 22 25 30 33 33 33 6.8 11.7 16.3 22.2 26.3 30.2 36.2 37.7 45.1 __ -- 7333 21 24 30 30 30 -- 13.8 18.9 24.5 28.7 32.9 -- 7.5 31 31 -- 7337 21 25 36 34 6.9 13.4 17.9 23.5 27.4 31.0 36.8 38.1 -m -- 7338 21 24 29 31 31 -- 13.7 28.5 7.5 18.5 24.3 32.6 -- -- -w 8167 19 23 29 30 30 -- 13.5 18.5 24.4 28.7 32.9 -- 7.2 __ __ 8175 19 30 32 32 -- 23 6.7 12.8 17.6 23.5 27.6 31.5 -- __ 8328 17 22 27 31 31 31 14.0 19.2 25.2 29.5 33.7 40.2 41.9 6.7 H 6 = 0.74, Room Temperature, 1725 cpm, Longitudinal, 8000 Hours’ Exposure -- -- -- 31 45 45 7402 24 37 6.6 11.2 15.0 19.3 22.2 25.0 -- -_ -_ 7403 23 28 35 37 37 -- 13.1 17.1 22.0 25.4 28.8 -- 7-7 m m __ 23.5 26.7 _- 7404 21 33 33 39 39 -- 6.0 11.4 15.5 20.0 __ __ 7414 24 23 34 38 38 -- 11.9 15.9 20.7 24.0 27.3 -- 6.7 7420 23 26 32 34 38 38 6.5 12.7 17.1 22.1 25.9 29.3 34.6 36.0 43.0 7421 23 27 35 39 39 6.6 12.0 16.2 21.0 24.3 27.5 32.7 34.0 41.5 __ _- 7427 23 28 35 37 31 -- 10.9 15.0 23.3 26.7 -- 5.3 19.8 0 = 0.74, Room Temperature, 1725 cpm, Tramverse, Unexposed -- __ -- 6209 16 21 25 29 29 32.6 36.9 -- 8.7 15.6 21.6 28.0 6211 18 22 2‘ 7 30 31 31 8.8 15.7 21.0 27.0 31.2 35.3 41.7 43.1 51.8 _- 7227 19 21 28 31 33 7.5 14.7 19.8 25.8 29.9 33.9 40.0 41.6 7350 20 21 28 31 31 31 14.5 19.2 29.9 34.0 40.5 42.1 51.1 8.5 25.4 -_ 8225 18 23 27 27 31 31 7.3 14.1 19.4 25.5 29.9 34.3 40.9 42.6 -- -_ 8227 17 22 26 26 26 -- 16.2 33.3 38.1 -- 8.3 21.8 28.5 Table B-1. (Continued) Total Thousands of Cycles to Iniicated Crack Leq~th(~), inch Crack Propagation Rate, pin. /cycle, at 0.150 Indicated Crack Lengda). inch Condition Specimen 0.250 0.350 0.500 0.625 0.750 0.950 (Initiation) 0.250 0.350 0.500 0.625 0.750 0.950 1.000 FaiIur&b) 0 = 0.74, 550 F. 1725 cpm, Longitudinal, Unexposed J -- -- 6344 12 14 17 17 11 -- 17.5 25.2 34.8 42.0 49.2 -- 6.9 -- -- -- 39.1 7336 14 15 18 18 18 8.7 16.7 23.7 32.9 46.5 -- 15 11 18 18 18 18.0 25.5 35.0 42.1 48.9 59.9 62.2 78.7 7339 13 8.3 8171 13 17 19 20 20 20 6.5 15.6 23.0 31.9 44.9 54.9 57.4 14.3 38.6 0 = 1.04, Room Temperature, 1725 cpm. Longitudinal. Unexposed K 10.6 14.1 16.6 18.8 22.5 23.4 30.2 6329 36 43 52 52 52 52 4.4 7.9 43 50 50 50 13.2 15.8 18.3 22.4 23.4 30.5 7324 36 36 3.4 7.0 9.8 -- 8326 35 43 47 47 47 47 6.8 9.5 13.7 16.5 19.1 23.3 24.3 3.4 0 = 1.38, -110 F, 1725 cpm, Longitudinal, Unexposed L 6350 57 71 83 89 89 89 5.7 7.6 10.4 12.6 13.1 15.8 1.8 4.2 9.0 10.9 13.4 14.0 17.0 6357 58 63 82 82 82 82 1.9 4.2 5.8 7.9 9.4 M 0 * 1.38, Room Temperature, 34 cpm. Longitudinal, Unexposed 7342 58 78 78 78 78 8 5.4 7.5 10.7 13.3 13.8 16.5 63 1.5 3.7 9.1 -- w- 79 -- 5.5 7.5 10.1 -- 7347 56 63 79 79 1.2 3.8 9.1 8161 53 58 71 71 76 76 5.7 7.9 9.1 11.4 14.0 14.6 17.5 1.2 3.8 -- -- 8168 49 63 78 78 78 -- 6.2 8.5 10.1 11.7 -- 1.8 4.3 0 = 1.38, Room Temperature, 1725 cpm, Longitudinal, Unexposed N 62 10.1 12.2 14.2 17.8 18.8 23.7 6342 44 50 62 62 56 2.3 5.3 7.4 _ _ 16.5 7325 50 56 64 64 64 64 6.2 8.8 10. I 12.6 15.7 1.8 4.3 8324 45 53 59 59 59 59 7.2 9.7 11.8 13.9 11.3 18.1 21.0 2.4 4.9 0 0 = 1.38, Room Temperature. 1725 cpm, Transverse, Unexposed -a 6207 43 48 61 61 61 61 7.4 10.1 12.2 14.2 11.5 18.3 2.2 5.2 6210 38 52 52 52 52 11.3 13. I 16.1 20.0 21.0 25.1 46 2.4 5.6 8.2 -w 10.4 14.5 18.0 19.1 7353 44 46 60 60 70 50 2.5 5.2 7.5 12.5 8177 42 46 58 58 58 58 1.3 4.7 7.0 9.9 12.0 14.2 17.6 18.5 22.2 8 = 1.38, 550 F, 1725 Longitudinal, Unexposed cpm, 8165 31 39 45 45 53 45 1.6 5.3 8.4 11.9 14.7 17.2 21.6 22.1 26.0 8172 30 42 44 44 44 44 1.8 5.5 8.6 12.1 14.9 17.1 22.2 23.3 28.2 Q 8 = 1.74, Room Temperature, 1200 cpm, Longitudinal, Unexposed 6347 57 70 83 83 83 76 1.4 3.6 5.3 7.3 8.8 10.3 12.9 13.6 16.6 -- 7332 58 71 83 83 83 78 1.1 3.2 4.7 6.7 8.2 9.7 11.9 12.6 7340 61 71 85 85 85 83 1.1 2.2 4.7 6.5 9.5 11.8 12.4 15.1 8.0 __ 8330 50 61 71 75 75 63 1.5 4.0 5.7 8.1 9.8 11.5 14.5 15.3 (a) Tip-to-tip crack length.

(b) Specimens cycled to failure from a l-inch nominal crack length without further adjustment of net-section stress.

(c) 0 = Net-section alternating stress amplitude/net-section mean suers.

(d) Blank indicates specimen teat stopped; specimen employed in residual-static-strength studies.

TABLE B-2. CRACK-PROPAGATION DATA FOR 4-INCH WIDE Ti-8Al-lMo- Center-notched, longitudinal, unexposed triplex-annealed specimens at a - Crack Propagation Rate, n in. /cycle, at Indicated Crack LenRth( *I, inch 0.150 Specimen 0.250 0.350 0.500 0.625 0.700 0.750 0.950 1.000 1.250 1.500 1.750 1.900 (Initiation) e(b) 0.38 8-C 6.2 9.1 14 17 17 17 21 21 22 23 23 23 30.7 21 23 23 23 23 47.0 8-D 5.6 8.5 12 14 17 17 21 0.74 8-A 24 34 38 44 50 52 60 60 65 69 69 69 7.3 59 67 67 67 67 7.3 8-B 24 29 40 45 47 50 59 (a) Tip-to-tip crack length.

(b) 0 = Net-section alternating stress amplitude/net-section mean suess.

(c) Specimens cycled to failure from 2-inch nominal crack length without further adjustment of net-sect&i stress.

TABLE B-3. CRACK-PROPAGATION DATA FOR P-INCH WIDE Ti-8Al-lMo- Center notched (KtZ 7.9) longitudinal, unexposed, triplex-annealed specimens at an Crack Propagation Rate, p in. /cycle, at Indicated Crack Length(a), in.

,g(b) Specimen 0.250 0.350 0.500 0.625 0.750 0.950 7348 2.0 3.2 5.2 7.9 11 19 0.26 0.38 7345 5.6 8.8 14 19 25 35 46 55 I5 111 0.14 7344 22 28 6341 34 50 15 100 142 208 1.04 81 101 143 285 1.38 8166 46 59 225 375 575 1.74 8164 70 115 131 -_ -.-__~ ___-~-~-~ (a) Tip-to-tip crack length.

(b) 0 = original net-section alternating stress amplitude original net-section mean stress.

TABLE 8-4. CRACK-PROPAGATION DATA FOR ?-INCH WIDE AM-350 STAINLESS STEEL SHEET 7.9). longitudinal specimens at a constant net- Center-notched (K,= - Crack Propagation Rate, p in. /cycle, at Indicated Crack Len&b), in. 0.130 Specimen 0.250 0.350 0.500 0.625 0.750 0.950 (Initiation) 630 19 23 29 33 34 38 3.0 6314 20 25 32 34 36 (4 2.6 34 -m 2.4 6319 20 25 34 34 20 27 34 36 43 -- 3.5 739 20 24 33 38 38 -w 3.1 20 23 28 29 34 35 3.9 20 24 30 31 33 __ 2.6 ~-. --- .~ - - (a) ,g = net-section alternating stress amplitude/net-section mean stress.

(b) Tip-to-tip crack length.

1V ALLOY SHEET SPECIMENS WITH CONSTANT NET-SECTION STRESS constant net-section mean stress of 25 ksi, room temperature, and 1200 cpm.

Total Thousands of Cycles to Indicated Crack LenRth(a), inch 0.250 0.350 0.500 0.825 0.700 0.750 0.050 1.000 1.250 1.500 1.750 1.000 2.000 FailurJC) 52.8 68.0 80.0 00.4 02.8 05.7 107 199 121 132 143 150 154 183 64.2 08.5 113 123 128 131 142 145 156 187 178 185 100 222 13.7 17.3 21.4 24.0 26.4 27.4 31.1 31.0, 36.0 30.9 43.2 45.4 46.0 54.0 25.2 12.3 16.1 20.7 23.6 26.4 30.0 30.0 34.0 38.6 42.4 44.7 46.2 53.5 1V ALLOY SHEET SPECIMENS WITH CONSTANT GROSS-SECTION STRESS original net-section mean stress of 25 ksi. room temperature, and 1200-1275 cpm.

Total Thousands of Cycles to Indicated Crack LenRrh(a), in.

0.150 ~~ - (Initiation) 0.250 0.350 0.500 0.625 0.750 0.050 1.000 Failure 043 1083 1122 1158 1177 1100 1205 1208 1226 80.5 115 120 142 150 156 163 164 172 6.8 12.6 16.7 20.0 23.4 25.3 21.5 21.8 20.6 3.4 7.3 0.8 12.2 13.6 14.6 15.6 15.0 16.6 1.8 4.6 6.6 8.8 10.1 11.2 12.2 12.4 12.8 1.1 2.0 4.1 5.3 6.0 6.4 6.8 6.0 1.2 - -- SPECIMENS AFTER 10,000 HOURS’ STRESSED EXPOSURE WITH CONSTANT NET-SECTION STRESS section mean stress of 40 ksi, room temperature, 1200 cpm, and /$“) = 0.75.

--.- Total Thousands of Cycles to Indicated Crack Lengttib), in.

~- ~- - - - 0.150 (Initiation) 0.250 0.350 0.500 0.625 0.750 0.050 1.000 Failure(c) 4.8 11.3 16.1 22.1 26.1 20.9 35.4 36.1 45.5 .~ 4.1 10.0 14.5 10.9 23.8 21.4 __ -_ __ 3.9 0.8 14.3 19.3 23.0 26.6 mm -_ -- 5.3 12.3 16.7 21.8 25.2 28.3 -- __ -- 4.7 10.3 14.0 20.3 23.9 27.2 mm mm __ 5.5 11.5 16.4 22.1 26.6 30.6 36.4 37.0 41.0 4.5 10.0 15.4 21.0 25.0 28.9 mm -- _- ---..- r- - (c) Specimens cycled to failure from l-inch nominal crack length without further adjustment of net-section stress.

(d) Blank Indicates specimen testing stopped; specimen employed in residual-static-strength studies.

APPENDIX C STRESS-LIFETIME DATA TABLE C- 1. STRESS-LIFETIME DATA FOR AM-350 STAINLESS STEEL AT - 110 F Maximum Stre s s , Specimen ksi Cycles to Failure Unexposed, Notched (Kt = 4. 0), Longitudinal, 40-Ksi Mean Stress 7135 120.0 1,000 7,000 7163 105.0 7164 25,000 90. 0 7132 75. 0 58,000 6139 120,000 70. 0 7158 67. 5 177,000 6148 65. 0 5,959,000, D.N.F.(a) 10,500 Hours’ Exposure, Notched = 4. 0), Longitudinal, 40-Ksi Mean Stress Wt 8145 90. 0 17,800 27,000 8128 80. 0 7150 70. 0 104,000 171,800 8146 65. 0 7138 60. 0 1,973,500 57. 5 3,067,000, D.N.F.

(a) D.N.F. - did not fail.

TABLE C-2. STRESS-LIFETIME DATA FOR AM- 350 STAINLESS STEEL AT ROOM TEMPERATURE Maximum Stre s 8, kei Specimen Cycles to Failure Unexposed, Unnotched, Longitudinal Zero Mean Stress 8166 160.0 12,300 8167 125.0 43,300 8171 110.0 87,500 8163 100.0 71,500 8165 90. 0 256,200 8169 80. 0 471,700 8150 75. 0 10,107,500, D.N.F.(a) 8148 75. 0 16,256,900, D.N.F.

70. 0 10,041,600, D.N.F.

Unexposed, Notched (Kt = 4.0), Longitudinal, Zero Me an St re s s 6319 65. 0 16,100 7318 55. 0 22,700 6316 50.0 30,000 7324 45. 0 43,400 7322 40. 0 99,000 8317 37. 5 116,000 6320 35.0 88,400 8322 32. 5 10,087,000, D.N.F.

Unexposed, Notched (I$ = 4.0), Longitudinal, 40-Ksi Mean Stress 7131 120.0 2,500 6143 98. 0 10,000 6156 80. 0 19,500 6158 70. 0 30,000 7130 60. 0 173,000 72,000 8138 57. 5 6144 56. 6 1,484,OOO 8133 55. 0 10,248,000, D.N.F.

TABLE C- 2. (Continued) Maximum Stress, Spe time n ksi Cycles to Failure Unexposed, Notched (Kt = 4.0), Transverse, 40-Ksi Mean Stress 6180 80. 0 17,800 6178 70. 0 37,300 6174 60. 0 99,400 6179 60. 0 119,100 6172 55. 0 195,300 6177 55. 0 10,115,500, D.N.F.

6173 55. 0 14,450,300, D. N. F.

6169 50. 0 17,026,300, D.N.F.

Unexposed, Unnotched, Room Temperature, 100-Ksi Mean Stress 8154 226.4 11,000 8158 210.0 19,400 195.0 37,600 8309 185. 0 52,500 175.0 104,200 7302 170.0 230,000 6310 165. 0 11,951,800, D.N.F.

Unexposed, Notched (Kt = 4. 0), Room Temperature, lOO-Ksi Mean Stress 7326 135.0 11,700 7311 134.8 13,700 130.0 11,800 6311 125.0 18,000 120.0 29,700 7321 115.0 80,000 110.0 1,606,000 6324 107.5 10,118,000, D.N.F.

(a) D. N.F. - did not fail.

TABLE C-3. STRESS-LIFETIME DATA FOR AM- 350 STAINLESS STEEL AT 550 F Maximum Stress, Specimen ksi Cycles to Failure Unexpoeed, Unnotched, Longitudinal, Zero Mean St rees 6353 125. 0 5,000 15,000 6355 110.0 8173 100.0 26,200 8174 95.0 36,300 7174 90. 0 138,200 D.N.F.ta) 7306 85. 0 11,859,900, D. N. F.

7173 82. 5 10,071,900, Unexposed, Notched (Kt = 4.0), Longitudinal, Zero Mean Stress 6323 50. 0 9,300 6312 13,200 45. 0 7323 40. 0 26,000 8312 37. 5 31,400 6313 35. 0 46,600 6314 32. 5 67,200 7316 30. 0 128,400 27. 5 180,900 7320 25. 0 12,006,000, D.N.F.

Unexposed, Unnotched, Longitudinal, 20-Ksi Mean Stress 6302 140.0 3,000 8306 135.0 9,100 7184 130.0 11,400 8305 125.0 15,400 6303 25,500 120.0 31,600 7183 115.0 110.0 45,700 6301 105.0 49,600 7171 102.5 6,351,900 7188 97.5 10,001,000, D.N.F.

TABLE C-3. (Continued) Maximum St re s s , Specimen ksi Cycles to Failure _____~_ .. . . ~- -.

- -T -z Unexposed, Notched (Kt = 4.0), Longitudinal, 20-Ksi Mean Stress 6182 60. 0 6,600 8324 55. 0 15, 4.00 7325 52. 5 18,000 7327 32,900 50. 0 8326 47. 5 45,000 6317 45. 0 76,100 7329 42. 5 1,984,600, D. N. F.

10,032,000, D. N. F.

7328 40. 0 Unexposed, Notched (Kt = 4.0), Longitudinal, 40-Ksi Mean Stress 6138 100.0 2,500 6135 88. 0 3,500 6145 75. 0 11,000 6134 70. 0 27,000 8142 65. 0 58,000 8141 63. 7 38,000 12,598,000, D.N.F.

7162 62. 5 7157 60. 0 10,044,800, D.N.F.

10,500 Hours’ Exposure, Notched (Kt = 4. 0), Longitudinal, 40-Ksi Mean Stress 7,200 8139 75. 0 8131 67. 5 14,300 8147 65. 0 239,800 340,200 7146 62. 5 8129 60. 0 6,113,700 TABLE C-3. (Continued) Maximum Stress, Specimen ksi Cycles to Failure Unexposed, Unnotched, Longitudinal, lOO-Kei Mean Streee 7177 195.0 8,4pO 8303 187. 5 17,200 7304 182. 5 24,100 180.0 21,800 7303 177.5 29,000 6351 175.0 21,800 6352 172.5 22,300 31,100 6354 170.0 8172 167. 5 30,100 6306 165. 0 135,200 7305 162. 5 152,500 7185 160.0 11,788,900, D.N.F.

Unexposed, Notched (Kt = 4.0), Longitudinal, lOO-Ksi Mean Stress 6321 125. 0 10,900 7319 122.5 17,000 8316 120.0 27,000 7315 117.5 46,000 7317 115.0 89,000 112.5 12,188,000, D. N. F.

8320 110.0 11,959,400, D.N. F.

(a) D. N.F. - did not fail.

TABLE C-4. STRESS-LIFETIME DATA FOR Ti-8Al-lMo-1V ALLOY AT -110 F Maximum Stress, ksi Cycles to Failure Specimen Unexposed, Notched (Kt = 4. 0), Longitudinal, 25-Ksi Mean Stress 8132 85. 0 2,600 77.5 7120 5,100 8138 70. 0 11,500 60. 0 7114 16,700 8150 50. 0 39,000 45. 0 8133 54,000 8114 45. 0 73,000 42. 5 8134 722,000 6132 42. 5 2,965,400, D. N. F. (a) 7117 40. 0 2,760,800, D. N. F.

6134 35. 0 2,810,400, D. N. F.

3000 Hours’ Exposure, Notched ( + ), TransverseL 25-Ksi Mean Stress K = 4. 0 7141 80. 0 2,700 7144 60. 0 16,300 8143 50. 0 47,500 49. 8 6140 36,000 6144 40. 0 2,485,200, D. N. F.

10,000 Hours’ Exposure, Notched (Kt = 4. 0), Longitudinal, 25-Ksi Mean Stress 6155 60. 0 9,000 50. 0 32,000 6152 47. 5 89,000 45. 0 86,500 42. 5 6130 139,000 6138 42. 5 192,000 40. 0 2,719,400, 6150 D.N.F.

- - did not fail.

(a) D.N.F.

TABLE C-5. STRESS-LIFETIME DATA FOR Ti-8Al-lMo- 1V ALLOY AT R O O M TEMPERATURE Maximum Stress, Specimen kei Cycles to Failure Unexposed, Unnotched, Longitudinal, Zero Mean Stress 7303 120.0 17,000 7310 110.0 23,800 6311 100.0 28,200 8134 74,000 90. 0 8302 80. 0 286,000 1,089,500 6309 70. 0 6308 65. 0 7309 60. 0 l:$;;:::, D. N. F.(a) Unexposed, Notched (Kt = 4. 0), Longitudinal, Z e ro Mean St re s s 6177 50. 0 5,900 6146 40. 0 13,900 6147 30. 0 33,400 6176 25. 0 115,600 22. 0 99,500 156,300 6188 22.0 6189 20. 0 10,015,900, D.N. F.

6148 20. 0 10,217,800, D.N.F.

Unexposed, Notched (Kt = 4. 0), Longitudinal, 25-Ksi Mean Stress 6158 85. 0 2,400 7113 70. 0 5,000 12,000 6128 60. 0 8148 50. 0 26,000 7111 40. 0 94,000 6180 68,000 39.0 6181 83,500 39. 0 7118 267,000 35. 0 33. 7 236,000 7119 33. 0 3,098,OOO 6145 32. 5 10,000,000, D.N.F.

8135 30. 0 11,483,600, D.N.F.

TABLE C-5. (Continued) Maximum St re s s , Specimen ksi Cycles to Failure Unexposed, Notched (Kt = 4.0), Transverse, 25-Ksi Mean Stress 60. 0 6,900 8223 55. 0 11,600 8141 50. 0 22,500 45. 0 40,000 7223 40. 0 101,300 7222 35. 0 8,681>200 7221 32. 5 10,012,900, D.N. F.

Unexposed, Unnotched, Longitudinal, 60-Ksi Mean Stress 8307 150.0 9,700 8301 140.0 38,200 6318 130.0 42,500 7304 120.0 196,600 8305 110.0 106,900 7305 110.0 1,344,.300 1,014,100 7306 105.0 6317 100.0 3,862,500 6313 95. 0 8,739,OOO 8310 13,206,700 90.0 Unexposed, Notched (Kt = 4. 0), Longitudinal, 60-Ksi Mean Stress 8113 110.0 1,300 6320 100.0 3,500 8137 90. 0 9,600 8145 80. 0 15,400 6203 70. 0 103,400 8128 70.0 109,600 6190 65. 0 10,076,000, D.N.F.

7318 65. 0 10,013,700, D. N. F.

(a) D.N.F. - did not fail.

TABLE C-6. STRESS-LIFETIME DATA FOR Ti-8Al-lMo-1V ALLOY AT 550 F T---- ____- Maximum St re s s , Spe c ime n ksi Cycles to Failure Unexposed, Unnotched, -Longitudinal, Zero Mean Stress 8303 100.0 5,000 6316 90. 0 17,200 80. 0 35,800 70. 0 65,400 7313 70. 0 83,400 8311 65. 0 7,815,800 6310 55. 0 10,936,500, D.N.F.(a) Unexposed, Notched (Kt = 4.0), Longitudinal, Zero Mean Stress 6325 45. 0 11,300 8317 40. 0 13,300 35. 0 22,000 6323 30. 0 30,000 6324 25. 0 57,000 7322 22. 5 79,100 7317 20. 0 10,093,700 Unexposed, Notched (Kt = 4. 0), Longitudinal, 25-Ksi Mean Stress 8149 70. 0 2,300 7115 60. 0 7,500 50. 0 25,800 7112 40. 0 99,400 8130 35. 0 10,197,500, D.N. F.

35. 0 14,379,400, D. N. F.

7116 32. 5 12,053,000, D.N. F.

6136 30.0 11,174,000, D.N.F.

3000 Hours’ Exposure, Notched = 4.0), Transverse, 25-Ksi Mean Stress (Kt --- 7143 60. 0 6,500 6142 50. 0 17,300 8139 40.0 78,100 35.0 9,827,400, D. N. F.

TABLE C-6. (Continued) Maximum St re s s , Specimen ksi Cycles to Failure 10,000 Hours’ Exposure, Notched = 4. 0), Longitudinal, 25-Ksi Mean Stress 0% 6149 60. 0 7,500 6151 50. 0 21,500 6161 45. 0 35,900 6159 42. 5 44,600 6157 40. 0 713,400 6131 37. 5 11,805,000, D.N.F.

6156 35. 0 10,025,000, D. N. F.

Unexposed, Unnotched, Longitudinal, 60-Ksi Mean Stress 8312 120.0 12,200 7302 110.0 33,900 6306 107.5 25,000 105.0 2,554,500 6307 102.5 62,700 95. 0 10,036,000, D.N.F.

Unexposed, Notched (Kt = 4.0), Longitudinal, 60-Ksi Mean Stress 8319 90. 0 5,700 8324 85. 0 7,400 7316 80. 0 15,800 6322 75. 0 29,300 6321 72. 5 55,500 8321 70. 0 82,300 6327 67. 5 14,273,500, D. N. F.

8322 65. 0 11,202,900, D.N. F.

(a) D.N:F. - did not fail.

CR-215 NASA-LZdeY, I!%5 a ii