Prediction of Residual Stresses in the Boron Steel Sheet after Hot Press Forming using Material Properties Modeler and Abaqus

재료 물성 모델러와 Abaqus를 활용한 핫 프레스 포밍 후의 보론 강판내 잔류음력의 예측

The residual stress generated in the boron steel blank formed via hot press forming process was predicted by JMatPro, a material property modeler, and Abaqus. The numerical predictions were compared by the experimental measurements obtained by the instrumented indentation. Both the predicted and measured principal stresses monitored at the outer surface of central bending position were qualitatively in good agreement. It was concluded that the residual stresses generated from hot forming process is not negligible as it has been generally assumed, although the spring back deformation is quite small. This should be specially considered from the part design stage since the tensile nature of the residual stress exhibited on the surface may lead to the stress corrosion cracking.