NEW RELATIONSHIP DEFINING THE VALUES OF FLOW STRESS, TANGENT AND SECANT MODULUS

摘要

A new exponential approximate function of the flow stress curve (FSC) is proposed, enabling to define tangent ET and secant ES medullii. Their knowledge is important when analysing deformations of pressings section being loaded beyond critical buckling stresses. Under these conditions undesirable warpings appear. Derived correction coefficients η help to recalculate the critical buckling stress from elastic to plastic range of strains.