By Sing C. Tang and Jwo Pan
Functioning as an advent to trendy mechanics ideas and diverse purposes that take care of the technological know-how, arithmetic and technical points of sheet steel forming, this e-book info theoretically sound formulations in keeping with rules of continuum mechanics for finite or huge deformation, that could then be applied into simulation codes. The forming techniques of complicated panels via machine codes, as well as huge sensible examples, are recreated in the course of the many chapters of this publication so one can gain practising engineers by means of supporting them larger comprehend the output of simulation software program.
Content:
entrance subject
• Preface
• desk of Contents
1. creation to average car Sheet steel Forming techniques
2. Tensor, tension, and pressure
three. Constitutive legislation
four. Mathematical versions for Sheet steel Forming approaches
five. skinny Plate and Shell Analyses
6. Finite point equipment for skinny Shells
7. tools of answer and Numerical Examples
eight. Buckling and Wrinkling Analyses
Index
• in regards to the Authors
Read Online or Download Mechanics Modeling of Sheet Metal Forming PDF
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Additional info for Mechanics Modeling of Sheet Metal Forming
Sample text
The strain is thought of as the small or infinitesimal strain because the elastic strains usually are very small, and the geometry change is small. 2 A sheet specimen with respect to a Cartesian coordinate system and a schematic of the tensile stress-strain relation obtained from a sheet specimen. F €1 1 The dimensions of the width wand the thickness t of a sheet metal specimen decrease as the tensile strain ~ 1 increases. 2. For isotropic elastic materials, the normal strains ~ 2 and 2 ~ 3 in 3 the x2 and x3 directions are equal to each other.
Also in this figure, the initial part of the curve is linear. As the strain E continues to increase, the stress-strain curve becomes nonlinear. Sheet metals usually have both elastic and plastic anisotropy due to rolling processes. Therefore, material anisotropy is discussed in detail in this chapter. Isotropic and anisotropic linear elastic responses of materials are discussed first. Deviatoric stresses and strains then are introduced for the development of plasticity theories. Then, we concentrate on the nonlinear or strain hardening response of materials.
19) Constitutive Laws I 47 where A and ,u are Lame elastic constants. 22) Em 3 Different Models for Uniaxial Stress-Strain Curves When the tensile stress-strain relation becomes nonlinear for strain hardening materials, the stress-strain curves are quite different for different metals, such as those of aluminum and low-carbon steel near the yield point. 2% strain offset usually is used to determine the yield stress 00. 2% offset yield stress. 4, as the strain continues to increase, the stress increases nonlinearly.