Comprehensive correlations for small punch test response post-processing toward preserved mechanical strength estimation

The Small Punch Test (SPT) approach is a miniature specimen testing technique to estimate the preserved mechanical strength of an in-service component to check its fitness for service. The SPT results are summarised in form of force-specimen deflection, (F-u) and force-punch displacement, (F-v) response. There are many standards published in an attempt to define a universally accepted approach for SPT-aided echanical characterization. However, it was recognized that such standards were not concerned to practice a consistent approach while SPT response measurement and strength estimation towards outlining pro-claimed best-fitting correlations. This paper narrates limitations caused by known inconsistent practices and proposed comprehensive correlations for accurate strength estimation for metallic materials which are exposed to 100-2000 MPa strengths.