HP 15C:
Soderberg’s Equation for Fatigue
Source: Step by Step Solutions for your HP
Calculator: Engineering Applications.
HP32S. Hewlett Packard. Corvallis, OR. 1988
pg. 5254
Equation:
Syp/FS =
(Smax + Smin)/2 + K * (Syp/Se) * ((Smax – Smin)/2)
Variables:
R0 = Syp =
yield point stress
R1 = Se =
endurance stress reversed bending tests
R2 = Smax =
maximum applied stress
R3 = Smin =
minimum applied stress
R4 = K =
stress concentration factor
R5 = FS =
factor of safety
Instructions:
Enter the
known values in each of the variables.
Enter the number of the variable to be solved in register I ( [ STO ] [
TAN ] (I) ). To solve, enter a range,
and press [ f ] [ ÷ ] (SOLVE), [ e^x ] (B). (*or whatever label you assigned
this program to)
Program:
Step

Key

Key Code

001

LBL B

42, 21, 12

002

STO (i)

44, 24

003

RCL 0

45, 0

004

RCL÷ 5

45, 10, 5

005

RCL 2

45, 2

006

RCL+ 3

45, 40, 3

007

2

2

008

÷

10

009



30

010

RCL 2

45, 2

011

RCL 3

45, 30, 3

012

2

2

013

÷

10

014

RCL* 0

45, 20, 0

015

RCL÷ 1

45, 10, 1

016

RCL* 4

45, 20, 4

017



30

018

RTN

43, 32

Example:
Find the
yield point (R0) given the following:
R1 = Se =
33,000 psi
R2 = Smax =
20,000 psi
R3 = Smin =
10,000 psi
R4 = K = 1.5
R5 = FS = 2
Store 0 in
RI.
Solution: 55,000 psi
This blog is property of Edward Shore. 2016
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