Figure 4

Illustration of the different attachment mechanisms for each of the three tested fasteners. The SBs are represented by their cross-sections. In each subfigure, the SBs shown on the left are detached and the SBs shown on the right are attached. (a) Prong SBs, with a zoomed-in view highlighting the force (orange arrow) exerted by the receptacle (top part) laterally on the plug part (male stud, at the bottom). The receptacle part deforms slightly to achieve a press fit. (b) Spring SBs, with a zoomed-in view highlighting the force exerted by the spring within the snap fastener acting upon the plug (orange arrows). A press fit is achieved through the compressive spring. (c) Magnetic SBs, highlighting the magnetic force exerted by the upper part (pink arrows). The mechanical fit is maintained by the magnetic force and guided by a depression and a protrusion in the middle in the magnetic (top) and the non-magnetic parts (bottom), respectively.