Small Punch Test Method for SHM

Structural Health Monitoring methods are in general based on material testing during an operation of structures under monitoring. We propose a new method based on use of Small Punch Test, which does not require repair of the structure after sampling unlike classical testing methods. The way of material sampling for SPT makes it a non-destructive testing method thus allowing material condition assessment at any stage of machine life without the need to exclude it from usage and cause production downtime. In this work we investigate the influence of 250000h of work in extreme conditions on 10H2M material with the use of Small Punch Test methods. The material has been tested in both states: heavily fatigued and unused to prove SPT usability for the industry. To cross compare the results a Uniaxial Tensile Test has been conducted as well on both versions of the material. Small Punch testing methods included the assessment of Yield Stress, Ultimate Strength, and Ductile-Brittle Transition Temperature. A statistical approach has been used for results analysis to determine SPT accuracy in comparison to the standard testing methods.