The Titanium Advantage
In Aerospace, weight, reliability and safety are of paramount concern. Renton Coil Spring Company's titanium springs are unsurpassed in meeting these demands.
We start with quality titanium wire and bar certified to all major aerospace requirements. Computer design work is conducted on every part number prior to manufacture. This computer modeling ensures that the spring will meet all drawing requirements without exceeding material allowable or production capabilities. Should the model expose issues, they can be worked out with the customer prior to committing resources and costs. Production follows with proven, methods applied by a well trained workforce. Our workmanship and quality is of the highest standards. All external processes are conducted by certified vendors. Final inspection is completed on every work order to ensure you receive the highest quality parts that meet all specifications.
Assuming a material has an acceptable fracture toughness Kc (i.e. it is able to tolerate minor surface defects without fracturing), the three most important properties for a spring material are useable stress (f), Shear Modulus (G) and density (ρ). In fact, two materials can be compared by evaluating the relative values of σf2 /G if spring volume is of concern, or σf2/Gρ if spring weight is of concern. Results of a comparison between Beta-C and 17-7 can be seen in the table below. If we then invert the results and standardize using 17-7 as the baseline we can see that titanium requires approximately 50% of the space and will have 31% of the weight.
 |
 |
|
| Beta-C Titanium | 17-7 PH Stainless | |
|---|---|---|
| Useable Stress (σƒ) ksi | 100* (.689 GPa) | 100* (1.72 GPa) |
| Shear Modulus (G)ksi | 5600 (38.6 GPa) | 11,000 (79.3 GPa) |
| Density (ρ) lbs/in³ | .174 lbs/in³ (4.82 g/mm³) | .282 lbs/in³ (7.982 g/mm³) |
| Volume σƒ²/G | 1.78 | .909 |
| Weight σƒ²/Gρ | 10.31 | 3.22 |
| Relative Volume | 0.50 (50%) | 1.0 (100%) |
| Relative Weight | 0.31 (31%) | 1.0 (100%) |