HP 49g+, Руководство пользователя

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J @MOHRC
Start program PRNST
12.5˜
Enter
σ
x = 12.5
6.25\˜
Enter
σ
y = -6.25
5
\`
Enter
τ
xy = -5, and finish data entry.
The result is:
To find the values of the stresses corresponding to a rotation of 35
o
in the
angle of the stressed particle, we use:
$š
Clear screen, show PICT in graphics screen
@TRACE @
(
x,y
)
@
. To move cursor over the circle showing
φ
and (x,y)
Next, press
™
until you read
φ
= 35. The corresponding coordinates are
(1.63E0, -1.05E1), i.e., at
φ
= 35
o
,
σ
’
xx
= 1.63 kPa, and
σ
’
yy
= -10.5kPa.
An input form for the Mohr’s circle program
For a fancier way to input data, we can replace sub-program INDAT, with the
following program that activates an input form:
« “MOHR’S CIRCLE” { { “ σ x:” “Normal stress in x” 0 }
{ “ σ y:” “Normal stress in y” 0 } { “ τ xy:” “Shear stress”
0} } { } { 1 1 1 } { 1 1 1 } INFORM DROP »
With this program substitution, running
@MOHRC
will produce an input form as
shown next: