TY JOUR TI THE RESULTS OF STUDIES OF THE CRACKS DEVELOPMENT IN THE CYLINDER HEADS OF THE ENGINE YAMZ-238НБ KW stress KW deformation KW fatigue KW crack JO Bulletin Samara State Agricultural Academy AU Cherkashin, N.A. AU Zhiltsov, S.N. PY 2016 IS 1 PB Samara State Agricultural Academy