Can stress-strain relationships be obtained from indentation curves using conical and pyramidaI indenters?

摘要

Applying the scaling relationships developed recently for conical indentation in elastic-plastic solids with work-hardening, we examine the question of whether stress-strain relationships of such solids can be uniquely determined by matching the calculated loading and unloading curves with that measured experimentally. We show that there can be mu1tiple stress-strain curves for a given set of loading and un1oading curves. Consequently, stress-strain relationships may not be uniquely determined from loading and unloading curves alone using a conical or pyramidal indenter.