Large structures such as aircraft often break down, leading to major life-threatening accidents, but by nature, machines and
structures must not be damaged during service. For that purpose, each member of the structure must have sufficient strength.
Strength of materials gives a strong guideline of "what should be done so that it does not break during service" when designing
machines and structures, and it is a dynamic system that considers an object (solid) as a continuum. It is one. It is no exaggeration
to say that strength design of machines and structures cannot be done without knowledge of strength of materials. In this
lecture, we will first study the stress and strain of members that receive tensile, compressive, or shearing forces, which
are the basics of strength of materials, and then learn the basics of strength calculation for structure design.
To understand the basics of strength of materials, which is one of the four important mechanics in mechanical engineering.
- To understand important engineering quantities in strength of materials such as stress and strain.
- To calculate the strength of members that receive tensile or compressive force and shear force, and determine the dimensions of members.
- To calculate the strength of the member to be twisted, and determine the dimensions of the member.
- To perform stress analysis by recognizing the difference between uniaxial stress and triaxial stress state, and understand the difference between plane stress and plane strain state, understand the principle of Mohr's circle of stress correctly, and use it correctly for stress analysis.
- To understand English phrases of important keywords and solve simple problems written in English.
| Class schedule | HW assignments (Including preparation and review of the class.) | Amount of Time Required | |
|---|---|---|---|
| 1. | introduction ・ How to proceed with the lecture ・ Purpose of strength of materials, organization of basic knowledge (Chapter 1) |
Read the syllabus carefully. Review trigonometric functions and vectors in high school mathematics, as well as the mechanics of physics. Read pages 1 to 17 of the textbook. | 190minutes |
| 2. | Stress and strain (1) (Chapter 2) ・ Definition of stress and strain ・ Normal stress and shear stress ・ Shape change (deformation) |
Review and try to understand the normal stress, shear stress, and shape change (deformation) that occur inside the structure. | 190minutes |
| 3. | Stress and strain (2) (Chapter 2) ・ Stress-strain diagram (tensile test) ・ Brittle material, ductile material |
Review and understand stress-strain diagrams, brittle materials, and ductile materials. | 190minutes |
| 4. | Stress and strain (3) (Chapter 2) ・ Relationship between stress and strain (Hooke's law) ・ Allowable stress and safety factor (the concept of standard strength) |
Relationship between stress and strain (Hooke's law) Review and try to understand allowable stress and safety factor (the concept of reference strength) | 190minutes |
| 5. | Interim exam (1) Explanation and commentary on exam questions |
Review the contents of the 1st to 4th lectures | 190minutes |
| 6. | Tensile and compression (Chapter 3) ・ Extension of the rod ・ Statically indeterminate and statically indeterminate |
Review of straight bar, skeleton structure and stepped bar elongation | 190minutes |
| 7. | Tensile and compression (Chapter 3) ・ Extension due to own weight ・ Principle of superposition ・ Thermal stress |
To understanding by thoroughly reviewing the concept of own weight, superposition principle, and thermal stress, and solving problems. | 190minutes |
| 8. | Tensile and compression (Chapter 3) ・ Elongation of rods subject to thermal stress Energy Law (Chapter 9) |
To understanding by thoroughly reviewing the solutions using thermal stress, strain, and energy methods, and solving problems. | 190minutes |
| 9. | Interim exam (2) ・ Explanation and commentary on exam questions |
Review the contents of the 6th to 9th lectures | 190minutes |
| 10. | Torsion of shaft (1) (Chapter 4) ・Stress and strain in shafts |
Review of the relationship between torsional moment (torque), shear stress, and torsional angle in solid and hollow round shafts. | 190minutes |
| 11. | Torsion of shaft (2) (Chapter 4) ・ Indeterminate problem for axial torsion |
To understand the statically indeterminate problem of axial torsion | 190minutes |
| 12. | Complicated stress (1) (Chapter 8) ・ Three-dimensional stress component ・ Stress of inclined cross section ・ Generalized Hooke's law |
Review the three-dimensional stress component, the stress of the inclined cross section, and how to obtain the generalized Hooke's law. | 190minutes |
| 13. | Complex stress (2) (Chapter 8) ・ Mohr's circle of stress |
To understand by thoroughly reviewing how to obtain the stress of the inclined cross section by Mohr's circle of stress and solving the problem. | 190minutes |
| 14. | Final exam ・ Explanation and commentary on exam questions |
Review the 1st to 13th lectures | 190minutes |
| Total. | - | - | 2660minutes |
| Interim exam (1) | Interim exam (2) | Report assignment | Final exam | Total. | |
|---|---|---|---|---|---|
| 1. | 10% | 4% | 2% | 4% | 20% |
| 2. | 8% | 12% | 10% | 30% | |
| 3. | 10% | 10% | 20% | ||
| 4. | 2% | 8% | 12% | 22% | |
| 5. | 2% | 2% | 4% | 8% | |
| Total. | 20% | 20% | 20% | 40% | - |
(Interim exam 1: 20 points maximum) + (Interim exam 2: 20 points maximum) + (Practice task: 20 points maximum) + (Regular
exam: 40 points maximum) Perfect score) is passed. In the mid-term test 1, the achievement goals of 1, 2, and 5 are evaluated,
and in the mid-term test 2, 1, 2, 4, and 5 are evaluated. In the regular test, all of the goals 1 to 5 are evaluated. The
weights of each item in the regular test are the same. Be sure to ask one English question related to the range. In the evaluation
by the above test, the example level of the textbook can be solved reliably, 60 points if the understanding of the basic questions
of strength of materials is about 60%, the exercise level of the textbook can be solved reliably, and the understanding of
each element of strength of materials is 80. 80 points if it is about%, 100 points if the understanding of each element of
strength of materials is 100%.
Text: Japan Society of Mechanical Engineers: "Strength of Materials" (JSME Text Series)
References: William A. Nash: "Schaum's Outline of Theory and Problems of Strength of Materials (Schaum's Outline Series)" (McGraw-Hill)
Distribute exercise prints as needed.
References: William A. Nash: "Schaum's Outline of Theory and Problems of Strength of Materials (Schaum's Outline Series)" (McGraw-Hill)
Distribute exercise prints as needed.
Review the trigonometric functions and vectors that you learned in high school, as well as the mechanics of physics that you
learned in college.
- After the lecture (Omiya campus) (should make an appointment by email in advance)
- Online office hour will be announced on Scomb
- Non-social and professional independence development course
- Course that cultivates an ability for utilizing knowledge
- Course that cultivates a basic self-management skills
| Work experience | Work experience and relevance to the course content if applicable |
|---|---|
| Applicable | Development and evaluation of medical devices |
Last modified : Sun Mar 21 17:32:12 JST 2021