REPORT OF MATERIAL COMPARISON
SPRING PLATE
PT PLN INDONESIA POWER PLTP ULUMBU
MATERIAL COMPARISON
TENSILE
PROPERTIES
MAX. OPERATING
TEMP. OC
SPECIAL PROPERTIES
11,5 (79,3)
121
AVERAGE STRESS APLICATION,
LOWER COST SPRING.
10 (69,0)
288
HEAT RESISTANCE, AND
BETTER CORROSION
RESISTANCE
MIN. TENSILE STRENGTH
MODULUS OF ELASTICITY
(E)
MODULUS IN TORSION
(G)
Psi x 103 (MPa)
Psi x 106 (MPa x 103)
Psi x 106 (MPa x 103)
CARBON STEEL
147-283 (1014-1951)
30 (207)
STAINLESS STEEL AISI
304
125-325 (862-2241)
28 (193)
MATERIAL
SPECIFICATION
CARBON STEEL
STAINLESS STEEL AISI 304
STRIP SPRING WIDTH
20
10-3 m
STRIP SPRING WIDTH
20
20
10-3 m
STRIP SPRING THICKNESS
1.6
10-3 m
STRIP SPRING THICKNESS
1.6
1.7
10-3 m
STRIP SPRING LENGTH
180
10-3 m
STRIP SPRING LENGTH
180
180
10-3 m
MODULUS OF ELASTICITY
210
109 Pa
MODULUS OF ELASTICITY
193
193
109 Pa
LOAD
1
N
LOAD
1
1
N
MOMENT OF BENDING
180
10-3 Nm
MOMENT OF BENDING
180
180
10-3 Nm
MOMENT OF INERTIA
6.8267
10-12 m4
MOMENT OF INERTIA
6.8267
8.1883
10-12 m4
DEFLECTION
1.36
10-3 m
DEFLECTION
1.48
1.23
10-3 m
SLOPE
0.01
rad
SLOPE
0.01
0.01
rad
STIFFNESS
737.45
N/m
STIFFNESS
677.75
812.94
N/m
SOURCE : Fundamentals of Machine Elements, 3rd ed
Schmid, Hamrock, and Jacobson
CONCLUSION
BASED ON THESE DATA, IT CAN BE CONCLUDED THAT WITH THE SAME DIMENSIONS, SPRING PLATES MADE FROM CARBON STEEL HAVE HIGHER STIFFNESS THAN
STAINLESS STEEL BUT WITH A LOW LEVEL OF CORROSION RESISTANCE. AISI 304 STAINLESS STEEL MATERIAL HAS GOOD CORROSION RESISTANCE, BUT WITH THIS
DIMENSION THE STIFFNESS VALUE IS LOWER. SO TO GET THE SPRING PLATE PROPERTIES WHICH HAVE GOOD STIFFNESS AND CORROSION RESISTANCE, AISI 304 WAS
CHOSEN BUT WITH AN INCREASE IN THICKNESS OF 0.1 MM
Prepared By :
Checked By :
Approved By :
Approved By :
PT Sinar Sakti Matra Nusantara
PT Sinar Sakti Matra Nusantara
PT Sinar Sakti Matra Nusantara
PLN IP PLTP ULUMBU
M. Pandu Setiawan
Rachmat
Busro Rasyid
Date : 05 September 2023
Date : 05 September 2023
Date :
Date :