1、 One or more corrigenda exist with corrections to this document. These can be searched online and ordered free of charge at www.beuth.de December 2012 Translation by DIN-Sprachendienst.English price group 6No part of this translation may be reproduced without prior permission ofDIN Deutsches Institu
2、t fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 21.120.10!%?CO“2283244www.din.deDDIN 743-3Calculation of load capacity of shafts and axles Part 3: Strength of materials,English translation of DIN 743-3:2012-12
3、Tragfhigkeitsberechnung von Wellen und Achsen Teil 3: Werkstoff-Festigkeitswerte,Englische bersetzung von DIN 743-3:2012-12Calcul de la capacit des arbres et axes Partie 3: Rsistance des matriaux,Traduction anglaise de DIN 743-3:2012-12SupersedesDIN 743-3:2000-10www.beuth.deDocument comprises 8 page
4、sIn case of doubt, the German-language original shall be considered authoritative.09.15 DIN 743-3:2012-12 2 A comma is used as the decimal marker. Contents Page Foreword . 3 1 Scope . 4 2 Normative references . 4 3 Symbols, designations and units 4 4 Material strength values . 5 4.1 Fatigue strength
5、 5 4.2 Yield point 5 Annex A (normative) Ultimate strength values . 6 Annex B (informative) List of former designations of structural steel for comparison 8 Tables Table A.1 Ultimate strength values for non-alloy structural steels according to DIN EN 10025-2 . 6 Table A.2 Strength for weldable fine
6、grain structural steels according to DIN EN 10025-3 6 Table A.3 Ultimate core strength values for case hardening steels (corresponding to blank-hardened condition) according to DIN EN 10084 6 Table A.4 Ultimate strength values for quenched and tempered steels according to DIN EN 10083-2 and DIN EN 1
7、0083-3 7 Table A.5 Ultimate strength values for nitriding steels according to DIN 17211 7 Table B.1 Designations of structural steels . 8 DIN 743-3:2012-12 3 Foreword This standard has been prepared by Working Committee NA 060-34-32 AA Wellen- und Well-Nabe-Verbindungen of Section Antriebstechnik of
8、 the Normenausschuss Maschinenbau (Mechanical Engineering Standards Committee) in DIN. DIN 743, Calculation of load capacity of shafts and axles comprises: Part 1: General Part 2: Theoretical stress concentration factors and fatigue notch factors Part 3: Strength of materials Part 4: Fatigue limit,
9、endurance limit Equivalently damaging continuous stress Supplement 1: Examples to part 1 to 3 Supplement 2: Examples to part 4 Amendments This standard differs from DIN 743-3:2000-10 as follows: a) material designations have been updated. Previous editions DIN 743-3: 1998-05, 2000-10 DIN 743-3:2012-
10、12 4 1 Scope This standard deals with proving the strength of shafts and axles. It determines the material parameters required for proving the strength according to DIN 743-1. Users can make use of their own experience or data. This standard applies to ultimate strength values for the temperature ra
11、nge 40 C 150 C. For temperatures above = 150 C the ultimate strength values drop by more than 10 % and temperature-dependent ultimate strength values are required to be taken into account. The ultimate strength values are valid for the frequency range up to 100 Hz. The fatigue strength values are va
12、lid for the ultimate number of load cycles NG= 107. No difference is made between rotational bending and flat bending. The fatigue strength values have been given for the more unfavourable rotational bending. 2 Normative references The following referenced documents are indispensable for the applica
13、tion of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. DIN 743-1, Calculation of load capacity of shafts and axles Part 1: General DIN 743-2, Calculation of load capacity o
14、f shafts and axles Part 2: Theoretical stress concentration factors and fatigue notch factors DIN 17211, Nitriding steels Technical delivery conditions DIN EN 10025-2, Hot rolled products of structural steels Part 2: Technical delivery conditions for non-alloy structural steels DIN EN 10025-3, Hot r
15、olled products of structural steels Part 3: Technical delivery conditions for normalized/normalized rolled weldable fine grain structural steels DIN EN 10083-2, Steels for quenching and tempering Part 2: Technical delivery conditions for non-alloy steels DIN EN 10083-3, Steels for quenching and temp
16、ering Part 3: Technical delivery conditions for alloy steels DIN EN 10084, Case hardening steels Technical delivery conditions DIN EN ISO 18265, Metallic materials Conversion of hardness values 3 Symbols, designations and units Symbols Designations Units B(Rm) Tensile strength N/mm S(Re, Rp0,2) Tens
17、ile yield strength N/mm zdWCompression-tension fatigue limit N/mm bWFatigue strength under reversed bending stresses N/mm tWFatigue strength under alternating torsional stresses N/mm DIN 743-3:2012-12 5 4 Material strength values The parameters are valid for material test bars with diameter dB(see A
18、nnex A) or from semi-finished products with approximately the same diameter. The parameters for tensile strength Bcorrespond to the lower limits of the ranges valid for small nominal dimensions (reference diameter dB) given in metallurgical standards. The parameters for yield strength Scorrespond to
19、 the minimum values valid for small nominal dimensions (reference diameter dB) according to these standards. If it is proven that the parameters for tensile strength and yield strength given in this standard are exceeded, the other parameters can also be increased accordingly. 4.1 Fatigue strength U
20、nless otherwise specified, the fatigue strengths under reversed stresses can be calculated as follows: bW 0,5 B (valid for dB 7,5 mm) (1) zdW 0,4 B (2) tW 0,3 B (valid for dB 7,5 mm) (3) B(B= Rm) is valid for a temperature = 20 C. For case hardened shafts, Bis valid for the core hardness. The increa
21、se in strength through case hardening is taken into account by the factor for surface conditioning KV(see DIN 743-2). If the strength has been determined by Brinell hardness HHB, the following relation can be used as the mean value of the conversion values for steels according to Tables A.1 to A.5,
22、as given in DIN EN ISO 18265 (valid for HHB 360 HB or B 1 300 N/mm2, respectively). B 3,2 HHB quenched and tempered steels and core areas of case hardened steels (4) B 3,4 HHB soft annealed normalized steels (5) The Brinell hardness HHBis valid for a temperature = 20 C. It is important to know wheth
23、er Bor HHBapplies to the component size, which should be preferred (then K1(deff) = 1, see DIN 743-2), or whether it is known for the reference diameter dB(then, K1(deff) 1 and K1(deff) shall be determined according to DIN 743-2). 4.2 Yield point S(S = Rp0,2) is valid for temperature = 20 C and can
24、be taken from Tables A.1 to A.4. DIN 743-3:2012-12 6 Annex A (normative) Ultimate strength values The values apply to the respective given reference diameter dB; B = B(dB), S = S(dB) etc. and represent minimum values. Table A.1 Ultimate strength values for non-alloy structural steels according to DI
25、N EN 10025-2 AbbreviationaBaN/mm Sa,cN/mm zdWbN/mm bWb,dN/mm tWb,dN/mm S235JR 360 235 140 180 105 S275JR 410 275 170 215 125 E295 470 295 195 245 145 S355JO 470 355 205 255 150 E335 570 335 235 290 180 E360 670 360 275 345 205 aAccording to DIN EN 10025, dB 100 mm bApproximate values calculated by u
26、sing Equations (1) to (3) cValid for material reference diameter dB 16 mm dValid for material reference diameter dB 7,5 mm Table A.2 Strength for weldable fine grain structural steels according to DIN EN 10025-3 AbbreviationaBaN/mm2Sa,cN/mm zdWbN/mm bWb,dN/mm tWb,dN/mm S275N 370 275 150 185 110 S355
27、N 470 355 190 235 140 S420N 520 420 210 260 155 S460N 550 460 220 275 165 aAccording to DIN EN 10025, dB 100 mm bApproximate values calculated by using Equations (1) to (3) cValid for material reference diameter dB 16 mm dValid for material reference diameter dB 7,5 mm Table A.3 Ultimate core streng
28、th values for case hardening steels (corresponding to blank-hardened condition) according to DIN EN 10084 AbbreviationaBaN/mm ScN/mm zdWbN/mm bWb,dN/mm tWb,dN/mm C10E 500 310 200 250 150 17Cr3 800 545 320 400 240 16MnCr5 1000 695 400 500 300 20MnCr5 1200 850 480 600 360 18MoCrS4 1100 775 440 550 330
29、 18CrNiMo7-6 1200 850 480 600 360 Material reference diameter dB 16 mm aAccording to DIN EN 10084 bApproximate values calculated by using Equations (1) to (3) cEmpirical values dValid for material reference diameter dB 7,5 mm DIN 743-3:2012-12 7 Table A.4 Ultimate strength values for quenched and te
30、mpered steels according to DIN EN 10083-2 and DIN EN 10083-3 AbbreviationaBaN/mm SaN/mm zdWbN/mm bWb,cN/mm tWb,cN/mm 1 C 22 500 340 200 250 150 2 C 22 500 340 200 250 150 1 C 25 550 370 220 275 165 1 C 30 600 400 240 300 180 1 C 35 630 430 250 315 190 1 C 40 650 460 260 325 200 1 C 45 700 490 280 35
31、0 210 2 C 45 700 490 280 350 210 1 C 50 750 520 300 375 220 (1 C 60) 850 580 340 425 250 46Cr2 900 650 360 450 270 41Cr4 1 000 800 400 500 300 34CrMo4 1 000 800 400 500 300 42CrMo4 1 100 900 440 550 330 50CrMo4 1 100 900 440 550 330 36CrNiMo4 1 100 900 440 550 330 30CrNiMo8 1 250 1 050 500 625 375 3
32、4CrNiMo6 1 200 1 000 480 600 360 Material reference diameter dB 16 mm aAccording to DIN EN 10083 bApproximate values calculated by using Equations (1) to (3) cValid for material reference diameter dB 7,5 mm Table A.5 Ultimate strength values for nitriding steels according to DIN 17211 AbbreviationaB
33、aN/mm SaN/mm zdWbN/mm bWb,cN/mm tWb,cN/mm 31CrMo12 1 000 800 400 500 300 31CrMoV9 1 000 800 400 500 300 15CrMoV59 900 750 360 450 270 34CrAlMo5 800 600 320 400 240 34CrAlNi7 850 650 340 425 255 Material reference diameter dB 100 mm aAccording to DIN 17211 bApproximate values calculated by using Equa
34、tions (1) to (3) cValid for material reference diameter dB 7,5 mm DIN 743-3:2012-12 8 Annex B (informative) List of former designations of structural steel for comparison Table B.1 Designations of structural steels DIN EN 10025-2:2004 DIN EN 10025-3:2004 Designation Former designations for compariso
35、n Designation Former designations for comparison Material no. Abbreviation Material no. Abbreviation S235JR S275JR E295 S355JO E335 E360 1.0037 1.0044 1.0050 1.0060 1.0070 RSt 37-2 St 44-2 St 50-2 St 52-3 St 60-2 St 70-2 S275N S355N S420N S460N 1.0490 1.0562 1.8902 1.8901 StE 285 StE 355 StE 420 StE 460
