Boron/epoxy (B4/5505) UD lamina

Classic boron-fiber lamina, Vf ≈ 0.50; enormous compressive strength from the thick stiff fibers — repair patches, historic aircraft parts.

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PropertyValueSourceMethodConditionsNote
Density2 g/cm³Tsai & Hahn, Introduction to Composite Materials, 198023 °C, dry
E₁ (longitudinal)204 GPaTsai & Hahn, Introduction to Composite Materials, 1980ASTM D303923 °C, dry
E₂ (transverse)18.5 GPaTsai & Hahn, Introduction to Composite Materials, 1980ASTM D303923 °C, dry
G₁₂ (in-plane shear)5.59 GPaTsai & Hahn, Introduction to Composite Materials, 1980ASTM D351823 °C, dry
ν₁₂ (major Poisson)0.23 Tsai & Hahn, Introduction to Composite Materials, 198023 °C, dry
Xt (long. tension)1260 MPaTsai & Hahn, Introduction to Composite Materials, 1980ASTM D303923 °C, dry
Xc (long. compression)2500 MPaTsai & Hahn, Introduction to Composite Materials, 1980ASTM D341023 °C, dry
Yt (transv. tension)61 MPaTsai & Hahn, Introduction to Composite Materials, 1980ASTM D303923 °C, dry
Yc (transv. compression)202 MPaTsai & Hahn, Introduction to Composite Materials, 1980ASTM D341023 °C, dry
S (in-plane shear)67 MPaTsai & Hahn, Introduction to Composite Materials, 1980ASTM D351823 °C, dry
  • Tsai & Hahn, Introduction to Composite Materials, 1980

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.