Post-yield characterisation of metals with significant pile-up through spherical indentations

作者：Habbab H; Mellor BG; Syngellakis S^*

来源：Acta Materialia, 2006, 54(7): 1965-1973.

DOI：10.1016/j.actamat.2005.12.021

• plastic deformation
• macroindentation
• finite element analysis
• steels
• stress-strain relation

Finite element simulations of spherical indentations accounting for frictional contact provide validated load-indentation Output for assessing and improving existing methods used to determine the stress-strain Curve of materials with significant pile-up. The importance of friction to the proper assessment of the pile-up effect is established. Weaknesses in current characterisation relations and procedures are also identified. Existing correction formulae accounting for pile-up are modified so that the contact area radius is more accurately determined. This modification is implemented in the context of a characterisation process that relies on analysing unloading portions of load-indentation curves. Post-yield material behaviour predictions from Such analysis are found to be in very good agreement with the initial finite element material input.

• 出版日期2006-4