December 2012 DIN DIN 743-1 ICS 21.120.10 Supersedes DIN 743-1:2000-10 Calculation of load capacity of shafts and axles Part 1: General, English translation of DiN 743-1:2012-12 Tragfahigkeitsberechnung von Wellen und Achsen - Teil 1: Grundlagen, Englische Ubersetzung von DIN 743-1:2012-12 Calcul de la capacité des abres et axes : Partie 1: Base, Traduction anglaise de DIN 743-1:2012-12 Document comprises 25 pages Translation by DIN-Sprachendienst In case of doubt, the German-language original shall be considered authoritative No part of this translation may be reproduced without prior permission of English price group 13 DiN Deutsches Insttut fur Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany, www.din.de has the exclusive right of sale for German Standards (DIN-Normen). www.beuth.de 08.15 2096508 DIN 743-1:2012-12 A comma is used as the decimal marker. Contents Page Foreword.. Introduction 1 Scope. 2 Normative reference 3 Symbols, designations and units.... 4 Proof of avoidance of fatigue failure 4.1 Factor of safety ... 4.2 Working stresses.. 4.3 Fatigue strength value 5 under maximum load.. 5.1 Safety factor 5.1.1 Proof of avoidance of permanent deformation. 15 5.1.2 Proof of avoidance of incipient cracking (and/or overload breakage) in hard surfaces. 5.2 Component yield point.... 16 5.3 Component's incipient crack limit . 5.4 Working stresses (maximum stresses). 18 Annex A (informative) Explanations of the variation of load and/or stress, cross-sectional areas and the reading of ADk from the Smith diagram Annex B (normative) Schema of the safety factor calculation . .. 22 B.1 General schema .. .22 B.2 Total influence factor .24 Bibliography 25 Figures Figure A.1 - Variation of applied load with time (Fzd, Mp, Mt) and stress (ozd, Ob, ). .19 Figure A.2 - Origination of amplitude of bending moment Mp as a result of shaft rotation (rotational bending); force F with constant direction, shaft rotating (@ = 2 · π · n > O) ... .19 Figure A.3 Cross section parameters . .19 Figure A.4 - Load cases, represented in the fatigue strength diagram (Smith diagram). .20 Figure A.5 - Fatigue strength diagram with extension of the compression zone (component pressure yield point o&dFk) ..... Figure B.1 Calculation procedure for safety factors 23 Figure B.2 Calculation procedure for total influence factor K 24 2 DIN 743-1:2012-12 Tables Table 1 Determination of working stresses .. ..10 Table 2 - Increase factor for yield point at circumferential notch (αg and/or β according to DIN 743-2) and materials without hard surface.... ..17 Table 3 - Static support factor K2F for materials without hard surface ... ...17 Table 4 Determination of maximum stresses (maximum nominal stresses) .... ....18 3 DIN 743-1:2012-12 Foreword This standard has been prepared by Working Committee NA 060-34-32 AA Wellen- und Welle-Nabe. Verbindungen of Section Antriebstechnik of the Normenausschuss Maschinenbau (Mechanical Engineering Standards Committee) in DIN. DIN 743, Calculation of load capacity of shafts and axles comprises Part 1: General 一 一 Part 2:Theoretical stress concentrationfactors and fatigue notchfactors — Part 3: Strength of materials — Part 4: Fatigue limit, endurance limit Equivalently damaging continuous stress Supplement 1: Examples to part 1 to 3 一 Supplement 2: Examples to part 4 Amendments This standard differs from DIN 743-1:2000-10 as follows: Clause 5 has been revised: a)( for the verification of structural strength, a distinction has been made between proof of avoidance of permanent deformation and proof of avoidance of incipient cracks in hard surfaces; additions have been made to the determination of the component incipient crack limit; b) editorial changes have been made. Previous editions DIN 743-1: 2000-10 4 DIN 743-1:2012-12 Introduction necessary measure This standard contains the fundamental equations and the systematic procedure for verifying the load capacity of axles and shafts. This proof is furnished by d