Answer
Shot peening fuula birraa dalgee irratti dhiibbaa dhiibbaa haftee kan kakaasu yoo ta’u, kunis jalqabbii fi babal’ina caccabaa dadhabbii dhorka. Burqaawwan dalgee yeroo qaxxaamuraa fibers alaa irratti dhiibbaa keessatti waan dadhabaniif, laayibariin dhiibbaa (akkaataa idileetti $0.005$-$0.010$ inchii gadi fageenya) dhiibbaa harkisaa hojiirra ooleen osoo caccabni guddachuu hin danda’in mo’amuu qaba. Paaraameetotni adeemsaa Almen Intensity (fkn, $0.006$-$0.008$ A) fi Coverage (xiqqaa 100%) tiin ibsama. Birraa 17-7PH tiif, dhukaasa peening daangaa dadhabbii $80$ ksi irraa gara $120$ ksitti guddisuu danda'a. Haa ta’u malee, burqaawwan baay’ee haphii ta’aniif ($t < 0.015$ inchii), ‘garmalee peening’ akka hin uumamneef shot peening of eeggannoodhaan to’atamuu qaba, kunis warping fiduu danda’a ykn dhugumatti surface micro-cracks fiduu danda’a.
