Stress-strain relation
The main test result is the stress-strain-relation of the TRC, presented in form of x-y-diagrams with strains on the x-axis and stresses on y-axis.
Strain
To determine the strain ε of the tensile specimen, the measured deformations Δl of the extensometer are averaged and then related to the measuring length l
m.
Maximum strain ε
u
is defined as strain at maximum load F
u.
Stress
For the determination of the stresses, the measured force F is related to the cross-section of the specimen A
c. If needed for design purposes, the force F can also be related to the cross-section of the textile reinforcement A
f.
or
Maximum stresses σ
cu and σ
fu, respectively related to A
c and A
f, is defined as stress at maximum load F
u.