Hi, Do helical springs have hysteresis. Say I do an exercise of plotting deformation Vs load curve of a helical spring, one way will be starting from load zero and increasing till the spring achieves solid length. The other way will be loading the spring till solid length and measuring deformation during releasing load progressively. Will both the methods give collinear lines? If there is a hysteresis (of helical springs in specific), why does it occur? Thanks.