Shaft Calculation Base

Universitatea Brasov Program : MDESIGN Module version: 13.0

User Date

: : 16.12.2013

Customer: Proj. Nr:

Shaft calculation base This program allows to prove the bearing ability for shafts and axes. The calculation base is provided by DIN 743, edition of October 2008 draft. The proof of the bearing ability for shafts an axes is produced by defining a calculated safety. This safety is divided in the safety against fatigue fracture and the residual deformation (and flaw or forced break). When calculating the avoidance of fatigue fracture, constant stress amplitudes being equivalent to damaging loads are taken as a basis. These ones are resulting from the predetermined loads. When proving against the residual deformation or forced break, designated as a safety against yielding, only the maximum occurring load is determinant. This one is resulting from the predetermined loads, too. The calculation of safeties is related only to the point of a clear notch effect. For it, 9 calculable notches are at your disposal due to the graphical selection, principally. The scope is limited to steels. Welded members should be calculated separately. But the utilized standard or the present program is ineffective for this purpose! The calculation base for the module Shaft Calculation is provided by DIN 743, edition of October 2008 draft, part 1-4 “Tragfähigkeitsberechnung von Wellen and Achsen” (“Calculation of bearing capacity of shafts and axes”).

Input data: Shaft calculation in accordance with DIN 743 - standard version Geometry scheme

General shaft geometry

Calculation process

Dynamic and static strength proof

Type of loading: tension-pressure Type of loading: bending Type of loading: torsion

Dynamically pure cyclic Dynamically pure cyclic Dynamically pure cyclic

Factor for maximum loading (tension-pressure) Factor for maximum loading (bending) Factor for maximum loading (torsion) Specifications about the material Strength values according to

1 1 1

MDESIGN database (DIN 743) 18MoCrS4 1.7323

Material designation Material number Gage diameter For the gage diameter Tensile strength

dB = 11 B (Rm) = 1100 S (Re) = 775

Yield stress Cyclic fatigue strength under bending stress

bW = 550

Cyclic tension and pressure fatigue strength

zdW = 440 tW = 330

Cyclic torsional fatigue strength

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mm N/mm ² N/mm ² N/mm ² N/mm ² N/mm ²

Universitatea Brasov Program : MDESIGN Module version: 13.0

User Date

: : 16.12.2013

Customer: Proj. Nr:

Shaft calculation base Young's modulus

E = 215000 N/mm ² G = 83000 N/mm ² kg/m³  = 7850

Shear modulus Density Apply surface hardening to Material group Heat treatment Surface hardening

Total shaft Cemented steels trial hardened no

Shaft geometry

Shaft geometry Nr. Da l Di l Da r Di r L mm mm mm mm mm 1 60 0 60 0 24.7 5 2 70 0 70 0 6 3 90 0 90 0 105 4 85 0 85 0 5 5 75 0 75 0 81 6 70 0 70 0 30

Rz µm 1.6

r d: t: zd: b: t: mm mm mm 1 59.4 0 0 0 0

nzd: nb:

nt:

0

0

0

zd bd dB dBK dBK: BK: K: 0 0 0 0

6.3 3.2 6.3 1.6 1.6

2 2 1 1 0

0 0 0 0 0

0 0 0 0 0

0 0 0 0 0

0 0 0 0 0

0 0 0 0 0

0 0 0 0 0

0 0 0 0 0

0 0 0 0 0

0 0 0 0 0

Predetermine the diameter determinant for the heat treatment ?

x=0 n : 222.22 no

Bearing Nr.

Type =

1 2

Location bearing -> Location bearing Location bearing 1.20

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Universitatea Brasov Program : MDESIGN Module version: 13.0

User Date

: : 16.12.2013

Customer: Proj. Nr:

Shaft calculation base

Safety against fatigue fracture

L1

L2

> 1.20

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Universitatea Brasov Program : MDESIGN Module version: 13.0

User Date

: : 16.12.2013

Customer: Proj. Nr:

Shaft calculation base

Safety against incipient crack with hard surface

L1

L2

> 1.20

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Universitatea Brasov Program : MDESIGN Module version: 13.0

User Date

: : 16.12.2013

Customer: Proj. Nr:

Shaft calculation base

Resultant graphic Y-X-plane

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Universitatea Brasov Program : MDESIGN Module version: 13.0

User Date

: : 16.12.2013

Customer: Proj. Nr:

Shaft calculation base

Resultant graphic Z-X-plane

z

0

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