This research investigates the residual stresses and the residual product of strength & elongation of roll formed and Chain-die formed products. Those indexes reflect the quality of the fabricated products externally (geometrical dimension) and internally (products service life and potential defects such as delayed fracture).
Through the study including residual stresses analysis, FEA simulation and experimental measurement, the forming processes can be well understood and optimized to produce products with low residual stresses and high residual product of strength & elongation, i.e. an optimal product based on current AHSS.
Bend test and residual stress test methods will be investigated.