SPT results evaluation

Stať ve sborníku v databázi WoS či Scopus

en

Small punch test (SPT) is known as a powerful NDT tool for material properties determination of existing structures. The paper presents a description and results of SPT computer simulations performed with the steels in a wide range of yield strength and tensile strength. The true tension diagrams of these steels are created by the Hollomon's formula. Conventional mechanical properties of the steels are verified from the results of computer simulation of tensile tests, too. True mechanical properties are used for SPT simulation of steels. Relationships of loads and puncher displacements are shown in the paper. Subsequently parameters SPT, i.e. the maximum load, puncher displacement at maximum load, plastic tangent at the initial stage of SPT and "yield load" are carried out. Intersection of plastic tangent and axis of load determines "yield load". Causal relations between the characteristics of static strength steels and SPT parameters are shown as graphic results. Quite notable is the influence of hardening exponent in causal relations and correlation of yield strength with "yield load". Two generally independent methods of estimating of yield strength and tensile strength from SPT results are presented. These methods are based either on causal relationships or derived regression models.

simulation, small punch test, evaluation, mechanical properties of steel, finite element method

2013-11-05

Vysoké učení technické v Brně

Brno

978-80-214-4799-8

NDE for Safety/Defektoskopie 2013

213–220

322