Skip redundant pieces
Center for Teaching Excellence

Making Biomaterial Development Real to Students—Elizabeth Friis


Graduate student in biomaterials lab
Graduate student in biomaterials lab

Project Notes

Stress and strain assignment #4 (PDF) (HTML)

Implants and more assignment #5 (PDF) (HTML)

Exam revisited assignment #6 (PDF) (HTML)

Medical device evaluation project (PDF) (HTML)

Reverse engineering guidelines (PDF) (HTML)

Project proposal guidelines (PDF) (HTML)

Update: Rubrics and assignments for Fall 2005 class

Rubric for Fall 2005 class (PDF) (HTML)

Background | Implementation | Student Performance | Reflections | Comments

Implementation - Stress and strain assignment #4

ME 765: Biomaterials
Fall 2003

Homework #4 – due 10/28/03

1. Using Figure 6.7 in your textbook, answer the following questions:

  1. How much stress will be developed if the abdominal skin is stretched 30% in the parallel and in the perpendicular direction to the cephalocaudal direction of the body?
  2. What are the strains if the skin is stressed to 1 MPa?
  3. What are the moduli of elasticity in the two principal directions?

2. Presume the given force versus displacement curve was obtained by tensile testing of canine skin. The skin specimen was cut by using a stamping machine that has a width of 4mm. The thickness of the skin is about 3 mm and the length of the sample between the grips is 20 mm.

  1. What is the tensile strength and fracture strain of the skin?
  2. What is the modulus of elasticity in the initial and secondary regions?
  3. What is the toughness of the skin?
(Click to enlarge)

3. As discussed in class, osteonal compact bone is a composite material on many levels. Briefly describe the mechanical function(s) of collagen fibrils in osteonal compact bone.

4. Formulate a hypothesis of why virtually all the tissues on our body were designed as viscoelastic materials. Give specific examples of when/why this behavior is beneficial to us.

<< Background ^TOP^ Observations >>