Material Properties And Stiffness
直径1㎜の円形グラファイト繊維の計算結果は
１．二次断面モーメント（I）
I＝4.91×10‐14m4
２．剛性（EI）
EI＝0.00982Nm２
この剛性値は、ヤング率200GPaとして計算
| Material | Tensile Strength (GPa) | Young’s Modulus (GPa) | Flexural Strength (GPa) | Strain at Break (%) | Density (g/cm^3) |
| Graphite Fiber (CFRP) | 3.5 | 230 | 1.5 | 1.5 | 1.8 |
| Stainless Steel | 0.5 | 200 | 0.5 | 40 | 8 |
| Nitinol | 1 | 41 | 0.2 | 6 | 6.45 |
Materials with Higher Stiffness and Flexibility Compared to Nitinol
Nitinol (nickel-titanium alloy) is known for its flexibility and ductility, but its stiffness (Young’s Modulus) is relatively low at around 41 GPa. Here are some alloys that offer higher stiffness while maintaining reasonable flexibility.
Beryllium Copper (BeCu)
**Usage:** Precision components, springs, contact parts
Properties
Tensile Strength: 1.1–1.4 GPa
Young’s Modulus: 115 GPa
Elongation: 10–15%
Density: 8.4 g/cm³
**Features:** High tensile strength, moderate stiffness, and good ductility.
Titanium Alloys (e.g., Ti-6Al-4V)
**Usage:** Aerospace, medical devices (implants, stents)
Properties
Tensile Strength: 0.9–1.1 GPa
Young’s Modulus: 110 GPa
Elongation: 10–15%
Density: 4.43 g/cm³
**Features:** Lighter than stainless steel with higher stiffness, excellent ductility, and corrosion resistance.
Cobalt-Chromium Alloys
**Usage:** Medical guidewires, stents, dental implants
Properties
Tensile Strength: 1.0–1.5 GPa
Young’s Modulus: 230 GPa
Elongation: 5–10%
Density: 8.3 g/cm³
**Features:** Very high stiffness and excellent wear resistance, though slightly less ductile.
Stainless Steel (e.g., 316LVM)
**Usage:** Medical devices (guidewires, catheters), structural components
Properties
Tensile Strength: 0.5–1.2 GPa
Young’s Modulus: 193 GPa
Elongation: 40–50%
Density: 8.0 g/cm³
**Features:** High stiffness, excellent corrosion resistance, and superior flexibility.
Follow me!
