en موتور احتراق داخلی Internal Combustion Engines (ICE, ...) پژوهشي Research Shot peening applies a residual compressive stress field (RCSF) on the surface of parts. It also shifts “crack nucleation sites” to sub-surface locations. A nondestructive method of measuring the stresses, Sin2ψ was utilized here and the stress values introduced to Ansys software. For this purpose, uniform stress in all directions was applied on the con rod. Loading on the rod in Ansys had three steps: RCSF caused by shot peening (measured by XRD), and tensile and compressive stresses caused by inertial and gas forces, respectively (calculated). Fatigue Macro of Ansys was resumed carrying out the cyclic loading and thereby, improvement of powder forged connecting rods' fatigue life, caused by shot peening was obtained. Fatigue Life, Shot peening, X-ray Diffraction, Ansys. 654 663 http://ase.iust.ac.ir/browse.php?a_code=A-10-63-67&slc_lang=en&sid=1 Honarvar Gheysari 180031947532846001026 180031947532846001026 Yes Babakhani 180031947532846001027 180031947532846001027 No Haerian 180031947532846001028 180031947532846001028 No