DIN 743-2 2012-12 PDF

Full title and description

Calculation of load capacity of shafts and axles — Part 2: Theoretical stress concentration factors and fatigue notch factors (German title: Tragfähigkeitsberechnung von Wellen und Achsen - Teil 2: Formzahlen und Kerbwirkungszahlen). This part gives the theoretical stress concentration (form) factors and fatigue notch (kerb effect) factors used in fatigue-strength calculations for shafts and axles.

Abstract

DIN 743-2:2012-12 specifies the size-influencing factors, surface factors, theoretical stress concentration factors (formzahlen) and fatigue notch factors (kerbwirkungszahlen) required for calculating component fatigue strength of solid and applicable hollow shafts. It supports the load-capacity methodology given in DIN 743-1 and provides limits and application notes for common notch and groove geometries.

General information

• Status: Current / Active (most recent edition 2012).
• Publication date: 1 December 2012 (2012-12).
• Publisher: DIN — Deutsches Institut für Normung e. V.
• ICS / categories: 21.120.10 (Shafts).
• Edition / version: Edition 2012-12 (replaces DIN 743-2:2000-10).
• Number of pages: 34 pages.

Bibliographic and status entries as listed in international standards catalogues and DIN product information.

Scope

Specifies the theoretical stress-concentration (form) factors and the fatigue notch (kerb effect) factors needed to compute component fatigue strength according to DIN 743-1. The values are intended for solid shafts and for hollow shafts where the bore does not influence the notch (orientation condition for circumferential notches: (D - di) / (2 · t) ≥ 3). The standard allows users to substitute their own validated results where available.

Key topics and requirements

• Definition and tabulation of theoretical stress concentration (form) factors for common shaft geometries and notches.
• Fatigue notch (kerb effect) factors for use in endurance-strength calculations.
• Size-influencing and surface factors that affect fatigue strength (guidance on diameter and surface condition effects).
• Application limits (solid vs. hollow shafts, geometric boundary conditions for bore influence).
• Notes on changes versus prior edition (revisions to groove/recess descriptions and limits on size-effect reductions for specific heat-treated steels).

Key requirements and amendment notes are drawn from the official DIN product information and the published normative text.

Typical use and users

Used by mechanical designers, fatigue analysts, drivetrain and axle manufacturers, rotating‑machine engineers, testing laboratories and researchers. Typical applications include fatigue and strength verification of shafts, axles, stepped shafts, fillets and groove features in power-transmission components and machine elements.

Related standards

This document is part of the DIN 743 series on shafts and axles (see DIN 743-1 — general basics; DIN 743-3 — material strength values; DIN 743-4 — endurance/fatigue limit equivalence; and the associated application supplements). It replaces the earlier DIN 743-2:2000-10 edition.

Keywords

shafts, axles, fatigue, stress concentration, formzahlen, notch factor, kerbwirkungszahlen, size effect, surface factor, endurance limit, DIN 743

FAQ

Q: What is this standard?

A: DIN 743-2:2012-12 is the DIN standard that provides theoretical stress concentration (form) factors and fatigue notch factors used to calculate the fatigue strength of shafts and axles.

Q: What does it cover?

A: It covers the tables, definitions and application limits for form numbers and kerb‑effect factors, plus related size and surface influence guidance needed for DIN 743‑1 based fatigue calculations.

Q: Who typically uses it?

A: Mechanical design engineers, drivetrain/axle manufacturers, fatigue and test laboratories, and researchers working on rotating components and strength verification.

Q: Is it current or superseded?

A: The 2012-12 edition is the current DIN edition for Part 2 and it replaces the 2000 edition; users should check national adoption or amendments for their country before application.

Q: Is it part of a series?

A: Yes — DIN 743 is a multi‑part series. Part 1 gives general basics and methodology, Part 2 provides form and notch factors (this document), Part 3 covers material strength values and Part 4 addresses fatigue/endurance-limit equivalence; supplements give worked examples.

Q: What are the key keywords?

A: Shafts, axles, fatigue, stress concentration factor, notch factor, formzahl, kerbwirkungszahl, size effect, surface factor.