BS 4759:1971

Co-operating organizations
Foreword
Method
1 Introduction
2 Scope
3 Principle of determination
4 Symbols and definitions
5 Test pieces for determining K
6 Preliminary checks
7 Determination of constancy of rate of increase of
    force in each force range
8 Determination of K-values
9 Assessment of K
10 Retesting
Figures
1 Typical force-extension diagrams for test piece
    material
2 Example of graph for determining constancy of rate
    of increase of force in each force range
3 Graph from which ratio vp/ve is determined

Principle of determination; symbols and definitions; selection, preparation and form of test piece; preliminary checks of testing machine; determination of constancy of rate of increase of force; procedure for determination, calculation and assessment of retesting. Applies to tensile testing systems used for determination of yield stresses in accordance with relevant parts of BS 18.