Question: Problem A polymer screw is used as an anchor for a tendon replacement, and is heavily loaded. It is found thatthe polymercreepsandslips out of

Problem A polymer screw is used as an anchor for a tendon

Problem A polymer screw is used as an anchor for a tendon replacement, and is heavily loaded. It is found thatthe polymercreepsandslips out of the hole boredfor it after an unacceptablyshorttime. Experimentsshowthat the Kelvin-Voigt modeldescribeshe behaviorof the screwwell over the time scaleof interest with E=500MPaand n=20106MPas a What is the characteristicime (alsocalledtransitiontime) of this materia? b. A 10% decrease in strain is acceptable before the screw slips out of the hole. long will it takebeforethis occurs? How c. What materialdesignstrategies can you recommendo correctfor this creepfailure mechanism?

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