ISSN: 0090-3973
Page Count: 5

Small Punch Testing in Creep Conditions
Dobeš, F
Senior researcher and group leader, Institute of Physics of Materials, Academy of Sciences of the Czech Republic,

Milička, K

Abstract

The creep behavior of low-alloy steel was studied using small punch tests under the action of constant force. Disks with a diameter of 8 mm and a thickness of 0.5 mm were pushed against a die with a bore of 4 mm diameter using a ball of 2.5 mm diameter. The time dependence of the central deflection was registered. The resulting dependence has the sigmoidal shape typical of conventional creep tests but with a very significant primary stage. The conventional constant-stress creep tests were performed for comparison. A simple method for the approximate correlation of the force in punch tests with the stress in conventional creep tests of the same duration is suggested.

Keywords:
small punch test, constant-stress creep test, time to fracture, life-fraction rule

Paper ID: JTE12388J
DOI: 10.1520/JTE12388J
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