This preview shows page 1. Sign up to view the full content.
Unformatted text preview: ralized, assume its elastic modulus is 12 GPa. Assume
concentric circular crosssections of the bone and implant. Page 5 of 10 ME/BioE C176 Final Exam, Spring 2001 Page 6 of 10 Name:__________________________________ ME/BioE C176 Final Exam, Spring 2001 Page 7 of 10 Name:__________________________________ ME/BioE C176 Final Exam, Spring 2001 Name:__________________________________ 4. Miscellaneous [28 points total]
A.
[5 points] Fill in the following table of elastic modulus properties with approximate values:
Material Young’s modulus
(MPa) Cortical bone †
Trabecular bone†
Young hip
Trabecular bone†
Old spine
Tendon
UHMWPE
PMMA
Ti6Al4V alloy
CoCr alloy, cast
CoCr alloy, forged
CoCr alloy, HIPed††
† for bone, give a typical mean value for the longitudinal direction.
†† HIPed — hot isostatically pressed.
B.
[15 points] The general timedependent behavior of many soft tissues, and even bone, can be
modeled approximately using springdashpot models, such as that shown below.
E KV
EH m
Show that the governing differential equation relating stress s to strain e for this model is of the form:
∂s
∂e
+ as= b
+ ce
∂t
∂t
by deriving expressions for the constants a, b, and c in terms of EH, EK V, and m. Page 8 of 10 ME/BioE C176 Final Exam, Spring 2001 Page 9 of 10 Name:__________________________________ ME/BioE C17...
View
Full
Document
This document was uploaded on 03/08/2014 for the course BIOE 119 at University of California, Berkeley.
 Fall '10
 Lee

Click to edit the document details