Technical and natural strain

In strain measurement techniques, especiallywhen using electric strain gages, the so-calledtechnical strain ε, at which the change inlength of a geometric section is referred to itsoriginal length, is the predominant straindimension.

In strain measurement techniques, especiallywhen using electric strain gages, the so-calledtechnical strain ε, at which the change inlength of a geometric section is referred to itsoriginal length, is the predominant straindimension.

It is very clear and the advantage is that thelinear expansion coefficient can be calculatedvery easily at any time, as the originallength is known before the test begins.