Hot isostatic pressing is to be used to produce the femoral head components of hip implants made from a novel grade of zirconia. A series of manufacturing trials have demonstrated that the processing route results in post-sintered surface features 43-107 µm (mean 74 µm) in size. In clinical use it is anticipated that the femoral heads will be loaded to maximum stress level of 50% of its tensile strength once implanted. What is the critical flaw size when in service and will the implant require polishing for it to withstand loading during clinical use? Where: • You may assume a value of 1.4 for Y • The grade of zirconia has a Tensile strength of 980 MPa and a fracture toughness of 11 MPa.m0.5

Elements Of Electromagnetics
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Hot isostatic pressing is to be used to produce the femoral head components of hip
implants made from a novel grade of zirconia.
A series of manufacturing trials have demonstrated that the processing route results in
post-sintered surface features 43-107 µm (mean 74 µm) in size. In clinical use it is
anticipated that the femoral heads will be loaded to maximum stress level of 50% of its
tensile strength once implanted.
What is the critical flaw size when in service and will the implant require polishing for it
to withstand loading during clinical use?
Where:
• You may assume a value of 1.4 for Y
• The grade of zirconia has a Tensile strength of 980 MPa and a fracture toughness of 11
MPa.m0.5
Select one or more:
a. 81.8 μm
b. 20.5 μm
c. 40.9 μm
Od. 163.6 μm
De.
O f.
Yes
No
Transcribed Image Text:Hot isostatic pressing is to be used to produce the femoral head components of hip implants made from a novel grade of zirconia. A series of manufacturing trials have demonstrated that the processing route results in post-sintered surface features 43-107 µm (mean 74 µm) in size. In clinical use it is anticipated that the femoral heads will be loaded to maximum stress level of 50% of its tensile strength once implanted. What is the critical flaw size when in service and will the implant require polishing for it to withstand loading during clinical use? Where: • You may assume a value of 1.4 for Y • The grade of zirconia has a Tensile strength of 980 MPa and a fracture toughness of 11 MPa.m0.5 Select one or more: a. 81.8 μm b. 20.5 μm c. 40.9 μm Od. 163.6 μm De. O f. Yes No
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