• advanced high strength steel
• finite element method
• hydrogen embrittlement
• sheet metal
• small punch test

The main focus of this thesis is the interpretation of small punch test data from 1.52 mm thickness Martensitic Advanced High Strength Steel (MS-AHSS) specimens.
First the mechanical behaviour of the small punch specimen is investigated by means of the Finite Element Method (FEM).
Then known methods for the estimation of constitutive parameters are adapted to the increased thickness specimen with use of multiple force-displacement curves of ideal materials obtained via the FEM, and those methods applied to experimental data.
Later a Coupled-Field FEM model is built to allow the simulation of small punch hydrogen-charged specimens in order to investigate hydrogen migration during the test. This may pave the way to model hydrogen embrittlement-affected damage or fracture laws that take into account the local diffusible hydrogen concentration.