ABSTRACT
This chapter presents a procedure to obtain the effective stress-strain material relationship at intermediate strain rates. The engineering strain is in the process identified on the basis of the displacement of different measurement markers. The results show that the optical strain measurement using a high speed camera and the evaluation with the presented MATLAB routine provides a good way to evaluate tensile tests at intermediate strain rates. The engineering stress-strain curve is the result of the uniaxial tensile test. It describes the load on the specimen as a function of the elongation in terms of the undeformed specimen geometry. The chapter provides a procedure to obtain engineering stress-strain curves until fracture using an optical measurement system. It explores a method for determining a material curve for finite element simulations on the basis of the test results. The comparative finite element simulation show very good agreement with the measured engineering stress-strain curve.
