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perhitungan pemilihan material, jenis-jenis material
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if the lowest value is rated as 100
Tabel of Formulas for estimating cost per unit
No Cross-Section and loading condition
1 Solid Cylinder in tension or compression
2 Solid cylinder in bending
3 Solid cylinder in torsion
Cost per unit strength
Cost per stiffness𝐶 𝑥 𝜌𝑆
𝐶 𝑥 𝜌𝑆23
𝐶 𝑥 𝜌𝑆23
𝐶 𝑥 𝜌𝐸
3 Solid cylinder in torsion
4 Solid cylindrical bar as slender column -
5 Solid rectangle in bending
6 Thin-walled cylndrical pressure vessel -
𝐶 𝑥 𝜌𝑆23
𝐶 𝑥 𝜌𝑆12
𝐶 𝑥 𝜌𝑆
Karakteristik dari kandidat material yang akan digunakan
No Material
(2) Fatigue
1 Stainless Steels 302 620 17.2
2 395 11.7
3 Tembaga (C11000) 345 17
4 483 23.2
5 830 9.2
Pairwise Comparison
PropertyDecision Number
1 2 3 4 5 6 7 8 9 10 11 12 13Tensile Strength 1 1 1 1 1
Fatigue 0 0 1 0 0
Thermal Expansion 0 1 1 0 1
Corrosion Resistance 0 0 0 0
Density 0 1 1 1
Young Modulus 0 1 0
Total Decision Number
(1) Tensile
Strength (Mpa)
(3) Thermal Expansion (1E-
6/K)
Baja Paduan rendah (AISI 1020 steel)
Paduan Alumunium (Alumunium Alloy 2024)
Paduan Titanium (Titanium AlloyTi-6Al-2Nb-1Ta-0.8Mo)
Scaled values of property and calculated Weighted Property Index
No MaterialScaled Properties
(1) (2) (3) (4) (5) (6)
1 Stainless Steels 302 74.6988 74.138 88.414 94.1463 69.5806602331
2 47.59036 50.431 88.526 100 56.2233764973
3 Tembaga (C11000) 41.56627 73.276 100 59.5122 59.144740442
4 58.19277 100 31.271 35.6098 50.1105317316
5 100 39.655 50.394 56.0976 58.4425254244
Relative Cost, Figure of Merit, dan Ranking of Material
No Material Relative Cost Figure of Merit
1 Stainless Steels 302 1.3353115727 1.6928304776 69.5806602331 41.1031471560696
2 1 1.9924050633 56.2233764973 28.218848432591
3 Tembaga (C11000) 0.979228486647 2.5232873178 59.144740442 23.4395583989145
Weighted Property Index
(γ)
Baja Paduan rendah (AISI 1020 steel)
Paduan Alumunium (alumunium Alloy 2024)
Paduan Titanium (Titanium AlloyTi-6Al-2Nb-1Ta-0.8Mo)
Cost of unit strength x100
Weighted Property Index
Baja Paduan rendah (AISI 1020 steel)
4 2.596439169139 1.4944308261 50.1105317316 33.5315163842997
5 8.571216617211 4.6263916199 58.4425254244 12.63242073437
Paduan Alumunium (alumunium Alloy 2024)
Paduan Titanium (Titanium AlloyTi-6Al-2Nb-1Ta-0.8Mo)
17.2 7.86 193
11.7 7.87 205
17 8.89 122
23.2 2.78 73
9.2 4.48 115
Decision Number14 15
5 0.3333333333333
1 0.0666666666667
3 0.2
1 1 0.0666666666667
1 4 0.2666666666667
0 0 1 0.0666666666667
Total Decision Number 15
(3) Thermal Expansion (1E-
6/K)
(4) Corrosion Resistance
(5) Density (g/cc)
(6) Young Modulus (Gpa)
Positive Decision
Weigthing Factor (α)
Scaled values of property and calculated Weighted Property Index
69.5806602331
56.2233764973
59.144740442
50.1105317316
58.4425254244
Figure of Merit Ranking
41.1031471560696
28.218848432591
23.4395583989145
Weighted Property Index
(γ)
33.5315163842997
12.63242073437
