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

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

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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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.m 0.5 ● Select one or more: a. 81.8 μm b. Yes c. 20.5 μm Od. No e. Of. 163.6 μm 40.9 μη
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