Page History

...

{html}<iframe width="600" height="338" src="//www.youtube.com/embed/v2zak9T5lLA?rel=0" frameborder="0" allowfullscreen></iframe>{html}

The

video

mentions

that

you

need

to

pay

attention

to

the

sign

of

the

strain

value

only,

not

the

direction

of

the

coordinate

system.

For

example,

 you should not be concerned,

if

say,

the

x-direction

for

one

of

your

gauge

points

in

the

opposite

direction

of

the

other

two

gauges

in

the

rosette.

This

is

because

the

strain

transformation

is

invariant

when

you

rotate

a

coordinate

direction

by

180

deg.

The

transformation

formula, , has cos(2*theta)

and

sin(2*theta).

When

theta

=

180

deg,

cos(2*theta)

and

sin(2*theta)

will

be

the

same

as

when

theta

=

0.

Go to Step 7: Verification & Validation

...