a resilient flexure has one end attached within a cavity in a rigid member , and the other end attached within a cavity in a structural mode . the cavities are shaped to limit the flexure &# 39 ; s bend radius . the member and the node have mating surfaces that abut to constrain the amount of rotation of the member . the aforementioned elements are shaped to prevent the strain in the flexure from exceeding its design limit when the joint is at its maximum angular deflection and the attached member is fully collapsed .