This book systematically discusses the basic principles and common problems of metal plastic forming. The book is divided into six chapters, including the mechanical basis of metal plastic deformation, the flow and forming law of metal in plastic forming process; The solution methods of plastic forming, namely principal stress method and slip line method; Deformation method, upper bound method, plastic material mechanics method, finite element method and physical simulation of plastic forming process are also briefly introduced. In order to facilitate students to review, study by themselves and deepen their understanding of the contents of this book, a large number of examples are listed in the book. At the same time, thinking questions and exercises are attached to the end of the chapter, and the answers to the exercises are attached to the end of the book.

This book can be used as a teaching material for undergraduate and junior college students majoring in material forming and control engineering, and also as a reference book for relevant professional and technical personnel. order

order

The first chapter is introduction.

First, the characteristics and classification of metal plastic salt forms

Second, the development of metal plastic forming theory

Third, the task of this course

Think about a problem

Chapter II Mechanical Basis of Metal Plastic Deformation

Section 1 Force Analysis of Metal Plastic Forming Process

The stress state analysis of a point in the deformed body in the second quarter

I. Stress analysis by section method

Second, the stress component and stress tensor of three-dimensional coordinate system

Three, the stress on any inclined plane

Four, the principal stress and stress invariants

Verb (abbreviation of verb) principal shear stress and maximum shear stress

Six, stress sphere tensor and stress deviation tensor

Seven, octahedral stress and equivalent stress

Eight, stress balance differential equation

Nine, plane stress state and axisymmetric stress state

Ten, stress Mohr circle

Analysis of strain state of particles in deformed body in the third quarter

First, the strain state of particles

Second, the relationship between displacement component and strain component-small deformation geometric equation

Thirdly, strain continuity equation.

Four, strain increment and strain rate tensor

Expression of plastic deformation degree of verb (abbreviation of verb)

Six, the condition of constant plastic deformation volume

Seven, plane deformation and axisymmetric deformation

The fourth quarter yield criterion

Tresca yield criterion

Second, von Mises's yield criterion

Thirdly, the geometric expression of yield criterion-yield surface and yield trajectory.

Fourthly, the influence of intermediate principal stress-a simplified expression of yield criterion

Verb (abbreviation of verb) Introduction to yield criterion of hardened materials

Section 5 Stress-strain relationship of plastic deformation

First, the elastic stress-strain relationship

Second, the characteristics of plastic stress-strain relationship

Thirdly, the incremental theory of plastic deformation.

Fourthly, the total plastic deformation theory.

Section 6 Actual Stress-strain Curve of Metal Materials

I. Tensile test curve

Second, the compression test curve

Third, the simplified form of the actual stress-strain curve

Fourth, the Bauschinger effect.

Thinking and practicing.