?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=ANALISIS+PERAMBATAN+RETAK+FATIK+BAJA+AISI+1020&rft.creator=+Jesi+Tiastuti%2C+1115021017&rft.subject=Mesin+(General).+Mesin+Sipil+(General)&rft.description=Abstrak+Bahasa+Indonesia+%0D%0A%0D%0APenelitian+ini+bertujuan+untuk+mengetahui+laju+dan+mekanisme+perambatan+retak+fatik+baja+AISI+1020+melalui+penampang+patahan+spesimen+hasil+uji.+Pengujian+perambatan+retak+fatik+baja+AISI+1020+menggunakan+mesin++++++MTS+Landmark+100+kN.+Parameter+yang+digunakan+pada+saat+pengujian+yaitu+Pmax+%3D+0%2C7+Pyield%2C+R+%3D+0%2C3%2C+%CF%83yield+%3D+395%2C5896+MPa+dan+f+%3D+10+Hz.++++++Dari+pengujian+diperoleh+data+panjang+retak+dan+jumlah+siklus+maka+dapat+dihitung+da%2FdN+dengan+menggunakan+metode+polynomial+incremental.+Hasil+regresi+dari+grafik+hubungan+antara+%CE%94K+terhadap+da%2FdN+diperoleh+laju+perambatan+retak+dan+faktor+intensitas+tegangan.+Sehingga+diperoleh+persamaan+y+%3D+8%2C107%EF%82%B410-14(%CE%94K)4%2C69.+Dimana+C+%3D+8%2C107%EF%82%B410-14+dan+m+%3D+4%2C69.+++++++++++++++++Pada+pengujian+ini+awal+retak+terjadi+pada+siklus+10.000+dengan+panjang+retak+4%2C745+mm.+Hasil+uji+SEM+retak+merambat+terjadi+pada+siklus+13.250+dengan+panjang+retak+10%2C464+mm.+Di+daerah+ini+dapat+dilihat+pola+patahan+intergranular.+Sedangkan+hasil+uji+SEM+batas+patah+pada+siklus+14.000+menunjukkan+adanya+dimple+dan+inklusi.+%0D%0A%0D%0A%0D%0AKata+Kunci+%3A+Fatik%2C+Perambatan+retak%2C+mekanisme+fatik%2C+laju+perambatan++++retak+fatik%0D%0A%0D%0A%0D%0AAbstract+Bahasa+Inggris+%0D%0A%0D%0AThe+purpose+of+the+research+is+to+determine+the+rate+of+fatigue+crack+propagation+of+the+AISI+1020+steel.+The+fatigue+crack+propagation+of+the+AISI+1020+steel+was+conducted+by+the+MTS+Landmark+100+kN+materials+testing.+The+parameters+used+during+testing+were+Pmax+%3D+0%2C7+P_yield%2C+R+%3D+0%2C3%2C+%CF%83yield+%3D+395%2C5896+MPa+and+f+%3D+10+Hz.+From+testing+data+crack+length+and+number+of+cycles+were+obtained+to+determine+da%2FdN+and+%CE%94K+using+the+incremental+polynomial+method.+By+ploting+da%2FdN+data+and+%CE%94K+in+log-log+scale+the+fatigue+crack+propagation+rate+was+obtained+by+linier+regression+method%2C+namely+the+material+constant+(C)+%3D+8%2C107%EF%82%B410-14+and+the+exponential+constant+(m)+%3D+4.69.+SEM+fractographic+observation+on+the+fracture+surface+at+when+the+crack+length+was+around+10.464+mm+at+13.250%2C+show+the+intergranular+fracture.+In+addition%2C+the+fracture+surface+morphology+shows+dimples+with+a+litle+inclusions+after+14.000+cycles.+%0D%0A%0D%0A%0D%0AKeyword%3A++Fatigue%2C+crack+propagation%2C+the+mechanism+of+the+fatigue+crack+++propagation+rate+fatigue.%0D%0A&rft.publisher=UNIVERSITAS+LAMPUNG&rft.date=2016-06-10&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F22927%2F1%2FABSTRAK%2520%2528ABSTRACT%2529.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F22927%2F2%2FSKRIPSI%2520FULL.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F22927%2F3%2FSKRIPSI%2520TANPA%2520PEMBAHASAAN.pdf&rft.identifier=+++Jesi+Tiastuti%2C+1115021017++(2016)+ANALISIS+PERAMBATAN+RETAK+FATIK+BAJA+AISI+1020.++UNIVERSITAS+LAMPUNG%2C+FAKULTAS+TEKNIK.+++++&rft.relation=http%3A%2F%2Fdigilib.unila.ac.id%2F22927%2F