In the Moldex3D simulation analysis, the X-Y curve is one of the important analyzing tools. We can use history curve to simulate the change of shear stress during the injection molding process. Users can install a sensor in the runner to monitor the changes of the stress. As seen in the left figure, the stress increases sharply when the melt enters the cavity and dissipates gradually in filling stage. At the end of filling and the beginning of packing stage, the stress drops significantly to near zero after 2 seconds of packing stage.