Analisa Kegagalan Pegas Ulir Pada Bogie Tipe Nt 11 (K5) Untuk Gerbong Kereta Ekonomi (K3)
Abstract: Fracture on thecoil
spring of bogie NT 11 (K5) of the economic passenger car(K3) is one of the
causes railway accidents. The purpose of this study is to determine the cause
of the failures and alternative solutions that can be done to reduce accidents.
Material of thecoil spring is spring steel SUP 9. Physical characteristics were
analyzed by the chemical composition investigation, macro-micro structur, SEM
investigation, while the mechanical characteristics were analized bytensile
shear stress test, compression shear stress test, impact test, and hardness
test. Finite Element Method was used to determine the stress distributions at
thecoil springs. Test results showed that cause of the failure in the coil
springswere as follows: 1) the chemical composition such as 2.010 % Si, 1.090 %
Cr, 0.073 % P were higher than the standard spring steels JIS SUP 9 so that to
increase the hardness, while 0.035 % Cu was lower than standard spring steels
JIS SUP 9 that causes corrosion. 2) gap of 10 mm made the spring was active so
that the highest stress is in this area andthat causes the cracks. The solution
is 1) Si, Cr, Cu and P elements were to be adapted the standard JIS SUP 9. 2)
make the gap of the coil springs with a die gap of 1 mm.
Penulis: Bayu Janoko, Triyono,
Eko Prasetya Budiana
Kode Jurnal: jptmesindd140453
