Strength of Material and Structure |
HASHIMOTO, Keizo |
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【Master's program･2nd semester】
15-3-1026 |
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Objectives |
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Effects of microstructures on the mechanical properties of materials such as fatigue and creep behaviors have been discussed. Strengthening mechanism of materials are studied systematically, based on the dislocation theory. Lattice defects such as vacancies, dislocations, stacking faults, grain boundaries, solute atoms, interstitial atoms, precipitates and so on will be discussed in detail using DVD program in University of Pennsylvania.
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Outline |
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This lecture presents the relationships between the mechanical properties of materials and their structures that are utilized in jet engines and airplanes. Strengthening mechanisms of materials are understood systematically, based on the lattice defects such as vacancies, dislocations, stacking faults, grain boundaries, solute atoms, interstitial atoms, precipitates and so on. Fracture and creep behavior and fatigue of metallic materials are also discussed. An overview of the effects of lattice defects on the mechanical properties of materials will be looked at. Observations of fractured specimens using the scanning electron microscope will be trained.
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Requirements (Assignments) |
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This course is related with the strength of materials and mechanics of materials in undergraduate course. Answer the questions in each chapter and report them.
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Schedule |
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Lectures
1. Inside a jet engine
2. Mechanical Properties 1; Definition of stress and strain, Hookes law
3. Mechanical Properties 2; Yielding and Schmid factor
4. Mechanical Properties 3; Large scale deformation, necking and rapture
5. Dislocation and Plastic Deformation 1; Slip, definition of dislocation
6. Dislocation and Plastic Deformation 2; Observations of dislocation using TEM
7. Dislocation and Plastic Deformation 3; Stress fields of dislocation
8. Dislocation and Plastic Deformation 4; Strain energy of dislocation and dislocation density
9. Fatigue and Creep 1; Solution hardening
10. Fatigue and Creep 12; fatigue fracture
11. Precipitation Hardening 1; Discovery of duralumin
12. Precipitation Hardening 2; Precipitation mechanism
13. Observation of Fracture Surface
14. Scanning microscope observations
15. Discussions
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Grading Policy |
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Assignments and final report
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Textbook and Reference |
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M. Kato, S. Kumai, S. Onaka; Strength of Materials, Asakura Publishing Co (1999)
C.J. McMahon: 'Introduction to Engineering Materials' University of Pennsylvania
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Note |
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Group discussions are recommended.
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