UD lamina
Kevlar 49/epoxy UD lamina
Aramid unidirectional lamina, Vf ≈ 0.60. Note the very low compressive strengths — aramid's known weakness.
| Property | Value | Source | Method | Conditions | Note |
|---|---|---|---|---|---|
| Density | 1.38 g/cm³ | Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed. | — | 23 °C, dry | — |
| E₁ (longitudinal) | 80 GPa | Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed. | ASTM D3039 | 23 °C, dry | — |
| E₂ (transverse) | 5.5 GPa | Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed. | ASTM D3039 | 23 °C, dry | — |
| G₁₂ (in-plane shear) | 2.2 GPa | Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed. | ASTM D3518 | 23 °C, dry | — |
| ν₁₂ (major Poisson) | 0.34 – | Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed. | — | 23 °C, dry | — |
| Xt (long. tension) | 1400 MPa | Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed. | ASTM D3039 | 23 °C, dry | — |
| Xc (long. compression) | 235 MPa | Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed. | ASTM D3410 | 23 °C, dry | fibers microbuckle — design aramid for tension |
| Yt (transv. tension) | 12 MPa | Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed. | ASTM D3039 | 23 °C, dry | — |
| Yc (transv. compression) | 53 MPa | Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed. | ASTM D3410 | 23 °C, dry | — |
| S (in-plane shear) | 34 MPa | Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed. | ASTM D3518 | 23 °C, dry | — |
Compare with
Sources
- Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed.
Typical room-temperature values for learning and preliminary design; grades vary. Always confirm against the supplier datasheet before design work. Data policy: docs/DATA-SOURCES.md in the repository.