Influence of the Wave Form on the Material Response Delay

Figure 9

Trapezoidal wave (𝜃=2, 𝑡_𝑟=1.25 sec.). (a) Raw data: time histories for load (above) and displacement (below). (b) Selected cycles: raw data and fit. (c) Hysteresis plot: normalized displacement versus normalized force. (d) Rotated hysteresis plot: measured points for increasing (green) and decreasing (blue) force and fitting curve (red).

(a)

(b)

(c)

(d)