#1. The section of the patellar ligament in the previous question is 50mm2 in cr
ID: 2053950 • Letter: #
Question
#1. The section of the patellar ligament in the previous question is 50mm2 in cross section. What is the stress in this section of ligament as a result of the 10,000N tensile force?#2. The yield strength of a material is 10MPa. The yield strain for this material is 0.10%. What is the modulus of elasticity for this material?
#3. The modulus of elasticity for a prosthetic material is 20GPa. A 3 cm long sample of this material is circular in cross section with a radius of 1 cm. This sample is stretched 3.003 cm. What tensile force was applied to the material to create this stretch?
Explanation / Answer
50 mm2 = 50x10-6 m2
1. Stress = Tension/ area= 10,000/(50x10-6)=200 Mpa
2. mod of elasticity = yield stess/yield strain = 10/.001 = 10000 MPa
3. Stress= 20000 MPa x 3.003/3 =20020 Mpa
Force = Stress x area
= 20020 x 106 x x 0.012
= 6,289,468.5 N
= 6.29 MN
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