File:Kt arbre epaule traction.svg

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Description
Français : Abaque de facteurs de concentration de contrainte (Kt) dans le cas d'un arbre épaulé en traction.
English: Stress concentration factors (Kt) chart for a shaft with shoulder fillet in traction.
Date
Source Own work, from Pilkey, Walter D., Peterson's Stress Concentration Factors 2nd ed., Wiley & sons (1997), ISBN 97-0-471-53849-3, p. 156
Author Cdang
 
This W3C-unspecified vector image was created with Inkscape .
Calculation
t is the fillet height, t = (D - d)/2
Coefficient for the calculation of Kt
β = t/r 0,1 ≤ β ≤ 2,0 2,0 ≤ β ≤ 20
C1
C2
C3
C4

Scilab source

// ********************
// Initialisation
// ********************

clear;
clc;

// ********************
// Fonctions
// ********************

// Saisie des paramètres géométriques

function [A]=param_geo()
    A(1) = input("grand diamètre : D = ");
    A(2) = input("petit diamètre : d = ");
    A(3) = input("rayon : r = ");
endfunction

// Calcul en traction

function [Kt] = Kt_traction(Alpha, Beta)
    drapeau = Beta <= 2;
    select drapeau
    case %t then
        coefs = [0.926, 1.157, -0.099;
            0.012, -3.036, 0.961;
            -0.302, 3.977, -1.744;
            0.365, -2.098, 0.878];
    case %f then
        coefs = [1.200, 0.860, -0.022;
            -1.805, -0.346, -0.038;
            2.198, -0.486, 0.165;
            -0.593, -0.028, -0.106];
    end
    C = coefs(:,1) + coefs(:,2)*sqrt(Beta) + coefs(:,3)*Beta;
    polynome = poly(C', "x", "c") ;
    Kt = horner(polynome, Alpha);
endfunction

// ********************
// Programme principal
// ********************

// Accueil

disp("Facteurs de concentration de contrainte d''un arbre épaulé")

// A(1) = D ; A(2) = d ; A(3) = r

A = param_geo();
t = 0.5*(A(1) - A(2)); // hauteur de filet
Beta = t/A(3); // t/r
Alpha = 2*t/A(1);

Kt_tr = Kt_traction(Alpha, Beta);

if (Beta < 0.1) | (Beta > 20) then
    disp("Attention, valeur extrapolée");
end
disp('Kt traction = '+string(Kt_tr));

Licensing[edit]

I, the copyright holder of this work, hereby publish it under the following license:
Creative Commons CC-Zero This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.

File history

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Date/TimeThumbnailDimensionsUserComment
current06:54, 24 April 2013Thumbnail for version as of 06:54, 24 April 2013637 × 751 (194 KB)Cdang (talk | contribs)Missing edges on the sketch
13:28, 23 April 2013Thumbnail for version as of 13:28, 23 April 2013637 × 751 (193 KB)Cdang (talk | contribs)caption: +t (fillet height), font = Times New Roman
12:53, 23 April 2013Thumbnail for version as of 12:53, 23 April 2013637 × 751 (192 KB)Cdang (talk | contribs)User created page with UploadWizard

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