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Ultrasonic guided waves are promising to evaluate fractured long cortical bones. Guided modes conversion, occurred always on the sites of fractures, contains rich information of bone geometric and material properties. The study is to analyze the correlation between Lamb modes conversion and crack depth of fractured long bones. Axial experiments were designed to investigate the influences of different deep fractures in steel-made bone phantoms and sheep diaphyseal tibias over Lamb modes propagation, especially modes conversion. For comparison, the phantoms were modeled by two dimension finite-difference time-domain method. Group velocities and energies of S0, A0 and converted modes were extracted and analyzed under varying crack depth conditions. Being consistent with the simulation, experimental data showed obvious modes conversions occur between S0 and A0 modes. The fracture …