Question: A significant load is applied wherein a polymer screw is used as an anchor for a tendon replacement. After a short lapse in time, the

A significant load is applied wherein a polymer screw is used

A significant load is applied wherein a polymer screw is used as an anchor for a tendon replacement. After a short lapse in time, the polymer is observed to creep and slip out of the hole bored for it. Experiments show that the Kelvin model describes the behavior of the anchor well over the time scale of interest, with E=500MPa and =20106MPas. (a) What is the characteristic transition time of this material? (b) At time t=0 the interference fit is approximately 1mm with a pre-drilled borehole that is 10mm wide. Determine the amount of time it will it take for the screw to relax whereby the interference effectively reduces to zero when the interference pressure relaxes to 10% of its original value and the anchoring screw slips out of the hole? (c) What design strategies can you recommend to correct for this failure mechanism

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