Assign 6 Tissue Mechanics

# Assign 6 Tissue Mechanics - Introduction to Biomechanical...

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Introduction to Biomechanical Systems Assignment 6: Tissue Mechanics Due: November 17, 2009 1. Assume the humerus is fixed at the shoulder, and a force F is applied downward at the elbow as in the figure. The humerus can be modeled as a hollow cylinder of length 25 cm. If the humerus fails in stress, what is the difference between the maximum loads that can be applied to the elbow of a young man vs. an elderly man without breaking the bone? Young man Elderly man D o = 2.5 cm D o = 2.0 cm D i = 1.0 cm D i = 1.25 cm 2. Given the force and bending distribution shown in the figure for a forearm holding a 120.1 N weight. If there is a 0.01 mm crack in the radius bone 8 cm from the elbow, determine how many times the subject can lift the weight before his/her bone fractures. Does your calculation likely overestimate or underestimate the actual number of lifts? Why? humerus F elbow shoulder Humerus cross section D o D i

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3. For the segmented model of a standing person shown in the
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Assign 6 Tissue Mechanics - Introduction to Biomechanical...

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