# Mechanics of Sheet Metal Forming, Second Edition by Jack Hu Ph.D. Mechanical Engineering University of

By Jack Hu Ph.D. Mechanical Engineering University of Michigan, Zdzislaw Marciniak, John Duncan

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Extra info for Mechanics of Sheet Metal Forming, Second Edition

Example text

7 Part of a load–extension diagram showing the jump in load following a sudden increase in extension rate. 21) ε˙ = L where L denotes the length of the parallel reduced section of the test-piece. e. 2 Effect of properties on forming It is found that the way in which a given sheet behaves in a forming process will depend on one or more general characteristics. Which of these is important will depend on the particular process and by studying the mechanics equations governing the process it is often possible to predict those properties that will be important.

12] Ex. 01 respectively. 45 and 50 mm respectively. 5 to 50 mm/minute. 27 kN] Ex. 8 mm thickness. 5 mm and the gauge length 50 mm. 69 Obtain engineering stress–strain, true stress, strain and log stress, log strain curves. From these determine; initial yield stress, ultimate tensile strength, true strain at maximum load, total elongation and the strength coefficient, K, and strain-hardening index, n. 1 Introduction In Chapter 1, the appropriate definitions for stress and strain in tensile deformation were introduced.

E. if β > −1, the sheet will thin. e. β < −1, the sheet becomes thicker. 3(a) is often plotted in terms of the engineering strain. 3(g), the strain paths for constant true strain ratio paths have been plotted in terms of engineering strain. It is seen that many of these proportional processes do not plot as straight lines. This is a consequence of the unsuitable nature of engineering strain as a measure of deformation and in this work, true strains will be used in most instances. Engineering strain diagrams are still widely used and it is advisable to be familiar with both forms.