Question

A total knee replacement experiences a spectrum of loading events, some rapid and some nearly steady state (but for a limited duration). Estimate the duration of the possible loading events, and compute the Deborah number for each, assuming a transition time for the polymer bearing of one day. Are any of these expected to occur in a fluid-like regime

Answer 1

Answer: your question is quite vague hence i will just give you the general answer regarding your question

answer : Deborah number = time of relaxation / time of observation

Explanation:

Estimate of the duration of the possible loading events

to estimate the duration of the possible loading events will first determine the Deborah number as shown

Deborah number = time of relaxation / time of observation

lets assume; Time of observation = 1 and time of relaxation = 1 day

Deborah number is dimensionless and it is used to determine viscoelastic behavior of a material hence the viscoelastic response during observation time is proportional to Deborah number