?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=PENGARUH+BEBAN+LEBIH+(OVER+LOAD)+TERHADAP+PERAMBATAN+RETAK+++++FATIK+PADA+BAJA++AISI+1020&rft.creator=RATIH+SAFRIA+HANDRIKA%2C+1115021061&rft.subject=620+Ilmu+teknik+dan+ilmu+yang+berkaitan&rft.description=Penelitian+perambatan+retak+fatik+baja+AISI+1020+dilakukan+dengan+menggunakan+mesin+MTS+landmark+100+kN+dengan+parameter+pengujian+R%3D0%2C3+dan+P_maks%3D+0%2C7P_y+pada+f%3D10+Hz+dalam+kondisi+temperatur+ruang.+Dalam+penelitian+ini+beban+lebih+sebesar+30%25+dari+P_maks+diberikan+setelah+panjang+retak+mencapai+5+mm%2C+hasil+menunjukkan+beban+berpengaruh+terhadap+perambatan+retak+fatik+yaitu+terjadinya+perlambatan+perambatan+retak.+Indikasi+ini+dapat+dilihat+dari+laju+perambatan+retak+baja+tanpa+overload+sebesar+da%2FdN+%3D+8%2C107+10-14+%CE%94K+4%2C69+sedangkan+laju+perambatan+retak+setelah+overload+sebesar+da%2FdN%3D+1%2C703+10-7+%CE%94K5%2C691.+Penampang+patahan+pada+permukaan+baja+setelah+uji+fatik+yang+diambil+pada+titik+sekitar+retak+sudah+mencapai+1%2C119+mm+menunjukkan+patahan+yang+lebih+halus+dibandingkan+pada+zona+perambatan.+Pada+titik+dimana+retak+3%2C611+mm+menunjukkan+permukaan+patahan+liat+yang+ditandai+dengan+adanya+dimple+fracture.+Morfologi+transisi+diamati+juga+setelah+panjang+retak+5%2C08+mm.+Permukaan+patahan+dengan+panjang+retak+5%2C922+ditandai+dengan+adanya+permukaan+rusak+parah.+Pada+titik+sekitar+panjang+retak+9%2C192+mm+permukaan+patah+adalah+transgranular.+Pada+permukaan+patah+dengan+panjang+retak+1%2C620+cm+permukaan+nya+lebih+kasar+dan+berserabut.%0D%0A%0D%0AKata+kunci+%3A+overload%2C+laju+retak+fatik%2C+retardasi+retak%2C+mekanisme+retak%0D%0A%0D%0A%0D%0A%0D%0AABSTRAK+BAHASA+INGGRIS%0D%0A%0D%0AThe+fatigue+crack+growth+(FCG)+rate+of+AISI+1020+steel+was+performed+using+the+MTS+Landmark+100+kN+under++testing+parameters+load+ratio+(R)+%3D+0.3%2C+P_max+%3D+0.7P_yield+%2C+and+f+%3D+10+Hz+at+room+temperature.+The+total+of+30%25+P_max+overload+was+applied+to+the+steel+during+FCG+testing+while+the+crack+length+reached+around+5+mm.+After+overload+applying%2C+the+fatigue+crack+growth+of+the+steel+showed+a+crack+retardation+for+a+certain+period+cycles.+In+this+case%2C+a+crack+retardation+was+attributed+to+plastic+deformation+formed+on+the+crack+tip.+Therefore%2C+the+FCG+rate+of+the+steel+is+descreased+to+the+lower+rate+(da%2FdN)+of+8.107%EF%82%B4+10%EF%80%AD14%CE%94K4.69+mm%2Fcycles+than+that+of+1.703%EF%82%B410%EF%80%AD7%CE%94K5.691+mm%2Fcycles+of++the+steel+without+oveload+applying.+Surface+fracture+morphology+of+the+steel+after+fatigue+testing+was+taken+at+when+the+crack+length+reached+1.119+mm%2C+showing+a+slow+FCG+rate+zona.+The+fracture+surface+morphology+at+the+total+crack+length+of+3.611+mm+shows+a+characteristic+dimples.+Fracture+surface+morphology+of+the+steel+after+overload+applying+at+the+crack+length+of+5.08+mm+shows+a+transition+fracture+when+the+crack+growth+was+a+slow+rate%2C+leading+to+decrease+a+lower+rate+of+FCG+until+the+total+crack+length+of+5.922+mm.+The+intergranullar+crack+growth+was+observed+at+the+crack+length+of+around++9.192+mm.+In+this+study%2C+the+overload+applying+on+the+steel+gave+a+positif+effect+only+when+the+total+of+crack+length+reached+around+16.2+mm%2C+after+that+the+FCG+rate+of+the+steel+shows+a+rapid+rate+until+static+fail.%0D%0A%0D%0A%0D%0AKeywords+%3A+overload%2C+the+fatigue+crack+growth%2C+crack+retardation%2C+dimple+fracture%0D%0A&rft.publisher=UNIVERSITAS+LAMPUNG&rft.date=2016-06-06&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F22851%2F2%2FABSTRAK%2520BAHASA%2520INGGRIS%2520%2526%2520INDONESIA.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F22851%2F19%2FSKRIPSI%2520FULL.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F22851%2F20%2FSKRIPSI%2520TANPA%2520BAB%2520PEMBAHASAN.pdf&rft.identifier=++RATIH+SAFRIA+HANDRIKA%2C+1115021061++(2016)+PENGARUH+BEBAN+LEBIH+(OVER+LOAD)+TERHADAP+PERAMBATAN+RETAK+FATIK+PADA+BAJA+AISI+1020.++UNIVERSITAS+LAMPUNG%2C+FAKULTAS+TEKNIK.+++++&rft.relation=http%3A%2F%2Fdigilib.unila.ac.id%2F22851%2F