In view of new material 36MnVS4 with higher fatigue strength,the fracture splitting performance of the connecting rod was studied in comparison with C70S6,and reason of the fracture splitting defects was analyzed.In term of the brittle cleavage fracture feature of the new material mode I crack,the K criterion and the maximal principal stress failure criterion were determined.Meanwhile,the splitting Finite Element Model(FEM)of connecting rod was established with starting notch.By observing the stress concent...