Fundamentals of Static and Fatigue Design

Course Information

College	Toyama College	Year	2024
Course Title	Fundamentals of Static and Fatigue Design
Course Code	0142	Course Category	Specialized / Elective
Class Format	Lecture	Credits	School Credit: 1
Department	Department of Mechanical Engineering	Student Grade	5th
Term	Second Semester	Classes per Week	後期:2
Textbook and/or Teaching Materials	TBD
Instructor	Okane Masaki

Course Objectives

Students can explain the stress states acting on tetrahedra and explain the basics of stress tensors.
Students can understand the strain energy in the triaxial stress state and explain the deviation stress.
Students can explain the maximum principal stress theory, the maximum shear stress theory, and the shear strain energy theory.
Students can imagine the stress state around the crack and can easily explain the stress intensity factor.
Students can explain the characteristics of typical fracture surfaces by fracture type.
Students can easily explain general fatigue characteristics.

Rubric

	Ideal Level of Achievement (Very Good)	Standard Level of Achievement (Good)	Unacceptable Level of Achievement (Fail)
Stress state	Students can explain the triaxial stress state and plane stress state in detail, and can obtain the principal stress and principal direction using a stress tensor.	Students can explain the triaxial stress state and the plane stress state to some extent, and can obtain the principal stress and the principal direction in the plane stress state by using the stress tensor.	Students cannot explain the triaxial stress state and plane stress state, and cannot obtain the principal stress using the stress tensor.
Strain energy	Students can understand the strain energy in the triaxial stress state and explain the deviation stress in detail.	Students can understand the strain energy in the triaxial stress state to some extent and can explain the deviation stress in general.	Students cannot explain the strain energy in the triaxial stress state.
Strength criterion	Students can properly understand and explain the maximum principal stress criterion, maximum shear stress criterion, and shear strain energy criterion in detail.	Students can understand and explain the maximum principal stress criterion, the maximum shear stress criterion, and the shear strain energy criterion to some extent.	Students do not understand or explain the maximum principal stress criterion, maximum shear stress criterion, and shear strain energy criterion.
Fundamentals of fracture mechanics	Students can imagine the stress state around the crack and explain the stress intensity factor in detail.	Students can imagine the stress state around the crack to some extent and can explain the stress intensity factor in general.	Students cannot imagine the stress state around the crack and cannot explain what the stress intensity factor is.
Fractography	Students can understand typical fracture surface morphology such as static fracture, fatigue fracture, impact fracture, etc., and can explain in detail what kind of history the fracture occurred by looking at the fracture surface.	Students can easily explain typical fracture surface morphology such as static fracture, fatigue fracture, and impact fracture.	Students do not understand typical fracture surface morphology such as static fracture, fatigue fracture, and impact fracture.
Fatigue strength	Students can understand the mechanism of fatigue fracture and explain in detail the effects of various factors on fatigue intensity and fatigue crack growth characteristics.	Students can understand the mechanism of fatigue fracture to some extent and explain the effects of various factors on fatigue strength characteristics.	Students do not understand the mechanism of fatigue fracture and cannot make a milestone on the effects of various factors on fatigue intensity characteristics.

Assigned Department Objectives

Learning and Educational Objectives of the “General Engineering” A-6 （核となる専門分野の既存技術を説明でき，社会から要求されている問題や実務上の問題を見出し設定することができる。）

JABEE 1(2)(d)(1) （専門工学（工学（融合複合・新領域）における専門工学の内容は申請高等教育機関が規定するものとする）の知識と能力）

JABEE 1(2)(e) （種々の科学、技術及び情報を活用して社会の要求を解決するためのデザイン能力）

Diploma policy 1 （To develop engineers who comprehensively acquire knowledge, focusing on mechanical engineering as the basis of manufacturing and production technology, and play a role in equipment design, technology development and other engineering-related fields.）

Teaching Method

Outline:

In this course, lectures are given for the purpose of understanding the strength design method of various mechanical structures based on the strength of materials, design drafting, materials engineering subjects, and each dynamical system in general. Students first learn about various failure theories on the extension of combinatorial stresses. Next, after learning about the basic mechanical handling of fracture materials, mechanical design methods to prevent such fractures in actual structures such as brittle fracture, ductile fracture, fatigue fracture, and impact fracture.

Style:

Lecture

Notice:

Students should have mastered strength of materials I, II, III, and Deformation and Fracture of Materials

Course Plan

			Theme	Goals
2nd Semester
	3rd Quarter
		1st	Guidance, foundation of the strength of materials and Deformation and Fracture of Materials	Confirmation of understanding of past courses.
		2nd	Stress and strain 1	Students understand and confirm triaxial stress states and plane stress states.
		3rd	Stress and strain 2	Students understand the stress acting on the tetrahedron, the stress tensor, the principal stress, and the principal direction.
		4th	Strain energy	Students understand strain energy and deviation stress in triaxial stress states.
		5th	Strength criterion 1	Students understand the maximum principal stress criterion, the maximum principal strain criterion, and the maximum shear stress criterion.
		6th	Strength criterion 2	Students understand the total strain energy criterion and the shear strain energy criterion.
		7th	Examination 1
		8th	Fundamentals of fracture mechanics 1	Students understand the singular stress field near the crack tip and the stress intensity factor.
	4th Quarter
		9th	Fundamentals of fracture mechanics 2	Students understand the energy release rate, Griffith fracture conditions, and planar strain fracture toughness.
		10th	Fundamentals of fracture mechanics 3	Students understand small scale yielding, Dugdale models, and elasto-plastic fracture toughness.
		11th	Examination 2
		12th	Fractography	Students understand the characteristics of fracture surfaces in brittle fracture, ductile fracture, fatigue fracture, and impact fracture.
		13th	Fatigue strength 1	Students understand the mechanism of fatigue fracture and fatigue tests.
		14th	Fatigue strength 2	Students understand the various factors influencing fatigue property.
		15th	Fatigue strength 3	Students understand fatigue crack growth characteristics and crack openings.
		16th	Final examination

Evaluation Method and Weight (%)

	Examination	Report	Total
Subtotal	80	20	100
Basic Ability	20	5	25
Technical Ability	60	15	75