Material Selection
Design optimization is depending upon selecting the correct material
to achieve the required criteria as per the table of "design
requirements versus material properties" which identifies the
critical design requirements and material properties that influence
them.
Careful examination of the properties required for a particular
design and the ranking of these properties in order of importance
will assist the designer in selecting of material that has the required
combination of properties.
Design Requirements Versus Material Porperties
Design Requirements |
Material
Property |
| Normal Force |
Modulus of Elasticity
Material Dimensions & Tolerances |
| Insertion Cycles or Durability
|
Resistance to Permanent Set
Fatigue (Low Cycle, R = O)
Contact Finish |
Load / Deflection Limits
Design Stress |
Yield Strength,
Modulus of Elasticity |
| Current Carrying Capacity |
Conductivity (Electrical & Thermal)
Stress Relaxation |
| Reliability |
Stress Relaxation
Contact Finish |
| Cost |
Density |
| Fabrication / Size |
Formability
Machinability
Solderability |
Copper Alloy Composition And Density
UNS
Designation |
Brush
Alloy |
Alloy
Name |
Chemical
Composition
(wt%), Cu Balance |
Density |
(Ib./in3) |
(g/cm3) |
C17200* |
25 |
Beryllium Copper |
1.8 Be, 0.2 Co |
0.302** |
8.36** |
|
190 |
Beryllium Copper |
1.8 Be, 0.2 Co |
0.302** |
8.36** |
|
290 |
Beryllium Copper |
1.8 Be, 0.2 Co |
0.302** |
8.36** |
C17300* |
M25 |
Beryllium Copper |
1.8 Be, 0.2 Co, 0.2-0.6
Pb |
0.302** |
8.36** |
C17000* |
165 |
Beryllium Copper |
1.7 Be |
0.304** |
8.41** |
C17510* |
3 |
Beryllium Copper |
1.7 Ni, 0.3 Be |
0.319*** |
8.83*** |
C17500* |
|
Beryllium Copper |
2.6 Co, 0.5 Be |
0.319*** |
8.83*** |
C17410* |
174 |
Beryllium Copper |
0.3 Be, 0.5 Co |
0.318 |
8.80 |
C19150 |
|
Leaded Ni Copper |
1.0 Ni, 0.8 Pb, 0.25 P |
0.320 |
8.88 |
C19400 |
|
Copper Iron |
2.4 Fe, 0.1 Zn |
0.317 |
8.78 |
C26000 |
|
Cartridge Brass |
30 Zn |
0.308 |
8.53 |
C51000 |
|
Phosphor Bronze A |
5.0 Sn, 0.1 P |
0.320 |
8.86 |
C52100 |
|
Phosphor Bronze C |
8.0 Sn, 0.1 P |
0.318 |
8.80 |
C65400 |
|
Silicon Bronze |
3.0 Si, 1.5 Sn, 0.1 Cr |
0.309 |
8.55 |
C68800 |
|
Aluminum Brass |
22.7 Zn, 3.4 A1, 0.4 Co |
0.296 |
8.19 |
C72500 |
|
Cu-Ni-Sn |
9.5 Ni, 2.3 Sn |
0.321 |
8.89 |
C7025* |
|
Cu-Ni-Si |
3.0 Ni, 0.65 Si, 0.15
Mg |
0.318 |
8.80 |
C72700* |
|
Spinodal |
9.0 Ni, 6.0 Sn, 0.1 Mn |
0.321 |
8.89 |
C72900* |
|
Spinodal |
15.0 Ni, 8.0 Sn |
0.323 |
8.95 |
N03360* |
360 |
Beryllium Nickel |
2.0 Be, 0.5 Ti, Ni balance |
0.294 |
8.14 |
* = age hardenable materials
** = density before age hardening = 0.298 lb/in3 (8.25 g/cm3)
*** = density before age hardening = 0.316 lb/in3 (8.75 g/cm3)
|
