spContent=This course aims to create a space for students to discover their passions for materials science and engineering. We hope that after studying this course, students will find metal materials are very interesting and very useful. More importantly, students can recognize that many of today's technological marvels depend on the availability of engineering materials and they will be more motivated and remain interested in how to apply the essentials of materials science and engineering.
This course aims to create a space for students to discover their passions for materials science and engineering. We hope that after studying this course, students will find metal materials are very interesting and very useful. More importantly, students can recognize that many of today's technological marvels depend on the availability of engineering materials and they will be more motivated and remain interested in how to apply the essentials of materials science and engineering.
—— Instructors
About this course
“Principles of Plastic Forming” is a specialized core course for juniors in the major of metal materials engineering. Mechanics and metallurgy fundamentals during plastic forming will be systematically introduced, and this course is also a preparative of further studies in this major, such as technologies of plastic forming, and materials design.
Basic concepts have already accumulated during students’ previous studies, whereas connections and applications of these concepts will be the core missions of this course.
This open online course will create a cross-cultural platform for cultivating outstanding engineers with international perspectives, and be a beneficial attempt for the engineering education reform.
This course will focus on the relations among basic concepts and their applications in materials. Cutting edge researches will be included, and online discussions will go through the whole course. Besides the knowledge learning, the course will motivate students to discover their interests and passions for materials science and engineering.
Objectives
1. Learn the mechanical methods of describing plastic deformation, and micro structure evolutions during plastic deformation.
2. Discuss the relationships among structures, properties and processing methods of metals and alloys, and cultivate students with critical thinking and analytical skills.
3. Improve students' abilities of communication and writing with English concerning problems of materials science and engineering.
Syllabus
Course Introduction
课时目标：In this chapter, plastic forming techniques, characteristics, applications and classification will be introduced. An overview about the objective and tasks of this course, and its position among curriculum of metal materials engineering will be summarized.
Stress Analysis
课时目标：Stress and strain are fundamentals of mechanical analysis of plastic forming, and will be introduced in the following 2 chapters. Their concepts, mathematical expressions, and applications in plastic forming analysis will be included.[2.1] stress state of a point. The expression and characteristics of a 3-dimensional stress of a point will be introduced.[2.2] principal stress and invariants of a stress tensor. The concept and calculation of principal stresses will be systemically introduced. Invariants of a certain stress tensor, the corresponding characteristic equation and the solving will be included. [2.3] principal shear stress, stress deviator, and equivalent stress. the concepts and mathematical expressions of principal shear stress, stress deviator, and equivalent stress will be introduced in this section.[2.4] examples. calculations of invariants of a certain stress tensor, characteristic equation, and principal stresses will be introduced with 2 examples.
2.1 stress state of a point
2.2 principal stress and invariants of a stress tensor
2.3 principle shear stress, stress deviator, and equivalent stress
2.4 examples
Strain Analysis
课时目标：Mathematical expressions and calculations of strain state of a point will be introduced with an analogy with that of stress state.[3.1] displacement and strain. The concept and mathematical expressions of strain will be introduced in this section.[3.2] analogy between the strain state and the stress state. mathematical expressions and calculations of strain state of a point will be introduced with an analogy with that of stress state.[3.3] plane stress and plane strain. Essential Characteristics and corresponding stress tensors of two important stress state, the so-called planar stress state and planar strain state, are introduced in this section. stress and strain state of many complex deformation processes can be decomposed to, or approximated to these two special states, which are very helpful in mechanical analysis of plastic deformation.[3.4] deformation computation and plasticity index. typical methods for quantitative description of plastic deformation, and typical parameters for indexing plasticity of metals, are introduced.
3.1 displacement and strain
3.2 analogy between the strain state and the stress state
3.3 plane stress and plane strain
3.4 deformation computation and plasticity index
Yielding Criteria
课时目标：principles and mathematical models of describing yielding of a material are introduced in this chapter.[4.1] yield criterion. Tresca's criterion and Von Mises’s Criterion are introduced in this section.[4.2] examples. the application of Tresca's criterion and Von Mises’s Criterion are demonstrated in this example.
4.1 yield and yield criterion
4.2 examples
Constitutive Equations
课时目标：basic assumptions in plastic theory, true stress, true strain, strain energy, and stress-strain relations are introduced in this chapter.[5.1] basic assumptions in plastic theory. basic assumptions in plastic theory, and characteristics of elastic and plastic deformation are briefly introduced in this section.[5.2] stress-strain relations for elastic solids. generalized Hook's law are introduced in this section.[5.3] stress-strain relations for plastic solids. characteristics of plastic deformation are introduced, and incremental theory and total strain theory are briefly introduced with an analogy with Hook’s law in elastic deformation.[5.4] true stress and true strain curve. concepts, mathematical models and calculation of true stress and true strain are introduced. Relations between engineering stress/strain and true stress/strain are summarized and experimental methods of determining the true stress-strain curve are introduced.[5.5] strain energy. strain energy during elastic and plastic deformation are introduced.[5.6] examples. the application of generalized Hook's law, and the calculation of stress and strain, are demonstrate in the following 2 examples.
5.1 basic assumptions in plastic theory
5.2 stress-strain relations for elastic solids
5.3 stress-strain relations for plastic solids
5.4 true stress and true strain curve
5.5 strain energy
5.6 examples
Friction and Lubrication in Metalworking
课时目标：Tribology and lubrication in metalworking are briefly introduced in this chapter. [6.1] tribology in metalworking. characteristics, classification, and mechanism of friction in metal forming, and 2 mathematical models of friction are introduced in this section.[6.2] effects of friction in metalworking. effects of friction in metalworking, residual stress, and the Utilization of friction during plastic forming are briefly introduced.[6.3] lubrication in metalworking. characteristics, mechanisms, methods of lubrication, and typical lubricants in metalworking are briefly introduced in this section.
6.1 tribology in metalworking
6.2 effects of friction in metalworking
6.3 lubrication in metalworking
Metallurgical Fundamentals
课时目标：Metallurgical Fundamentals, such as crystal structure, defects, and dislocation theory, recovery and recrystallization are introduced in this chapter.[7.1] crystal structures of metals. crystal structures are summarized, and typical structures of metals are introduced.[7.2] defects in metals. defects, such as vacancy, substitutional defect, interstitial defect, dislocations, grain boundaries, inclusions, voids and cracks in metal, are introduced.[7.3] plastic deformation mechanisms of metals. glide, twinning, grain slide and rotation, and critical resolved shear stress for slip are introduced in this section. [7.4] dislocation theory. movement and multiplication of dislocations, the interactions between dislocation and particles are introduced in this section.[7.5] recovery and recrystallization. mechanisms during hot working, recovery and recrystallization are introduced in this section.
7.1 crystal structures of metals
7.2 defects in metals
7.3 plastic deformation mechanisms of metals
7.4 dislocation theory
7.5 recovery and recrystallization
Cold working
课时目标：Structure and property evolution during cold working are discussed in this chapter.[8.1] structure evolutions during cold working. structure evolutions during cold working, such as grain shape change, sub-structures and texture, are introduced.[8.2] property evolutions and relations with structure during cold working. the relations between structure, property and processing are systematically discussed. metal strengthening methods, such as solid solution strengthening, work hardening, grain boundary strengthening, second phase strengthening, are discussed.
8.1 structure evolutions during cold working
8.2 property evolutions and relations with structure during cold working
hot working
课时目标：Structure and property evolution during hot working are discussed in this chapter.[9.1] structure evolutions during hot working. structure evolutions during hot working, such as fiber structure, recovery structure and recrystallization structure are introduced.[9.2] property evolutions and relations with structure during hot working. the relations between structure, property and processing during hot working are systematically discussed. procedures in metal working are summarized.
9.1 structure evolutions during hot working
9.2 property evolutions and relations with structure during hot working
9.3 superplasticity
Plasticity tuning for metals
课时目标：Influence factors for plasticity of metals, such as alloy component, impurities, phase constituent, grain size, texture, as cast structure, deformation temperature, strain rate, stress state/strain state, size, are discussed and the methods of plasticity enhancement are summarized.
10.1 Plasticity tuning -1
10.2 Plasticity tuning -2
展开全部
Prerequisites
Prerequisites: Advanced Mathematics，Engineering Mechanics，Foundation of Material Science
References
Text book:
George E. Dieter, Mechanical Metallurgy, McGraw-Hill Book Company, Third Edition (《金属力学》第三版, 清华大学出版社, 影印版), 2006.
References:
1. 俞汉清等，《金属塑性成形原理》，机械工业出版社，2011.
2. 彭大暑，《金属塑性加工原理》，中南大学出版社，第二版，2014.
3. 李尧，《金属塑性成形原理》，机械工业出版社，第二版，2013
