ESDU 89052: Construction of inelastic stress-strain curves

Abstract:

ESDU 89052 introduces a computer program, ESDUpac A8952, for computing the inelastic stress-strain curve, tangent and secant moduli, and the inelastic Poisson's ratio of a metallic material from limited commonly available materials properties. It requires values of the elastic modulus and two points in the inelastic region of the curve, and assumes that the curve can be represented by an equation containing the modulus of elasticity and two unknowns, a reference stress and a material characteristic. The method is valid for both tension and compression cases. The program input is explained, warnings provided when the program limitations are infringed are set out and, through two worked examples, the output is illustrated.

Indexed under:

Details:

Data Item ESDU 89052
Format:	PDF with software
Status:	Amendment (A), 01 Oct 1995 Published in Release 2000-03 (init)
Previous Releases:	None available
ISBN:	978 0 85679 726 2

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This Data Item is complemented by the following software:

Toolbox Apps

Name

Details

Toolbox 89052 Run

Title

Inelastic stress-strain curves from ESDU 89052

Version

1.1

Details

This app provides a method of estimating the stress-strain behaviour of a metallic material within the assumptions that this behaviour may be represented by a smooth continuous generalised curve. The method is valid for both tensile and compressive stress-strain data.

The curve is derived using the Young's modulus and two data points in the inelastic region (the tensile strength is used solely to limit the extent of the curve). The curve follows the modulus in the elastic region and in the inelastic region the greatest accuracy is in the region of the two data points used to derive the curve.

The two data points in the inelastic region may be given as either (a) two proof stresses and the corresponding permanent strains, or (b) two stresses and the corresponding total strains.

The theoretical basis for the generalised stress-strain form used by the app is detailed in ESDU 89052, 'Construction of inelastic stress-strain curves from minimal materials data', and ESDU 76016, 'Generalisation of smooth continuous stress-strain curves for metallic materials'.

Programs

Name

Details

ESDUpac A8952

Title	Construction of inelastic stress-strain curves from minimal materials data.
Version	3.1

This program is only available to subscribers.

ESDU 89052

Construction of inelastic stress-strain curves from minimal materials data (computer program).