Timber · Solid timber, hardwood · orthotropic

D65

Name: D65 — material properties (EN 338:2016)
Creator: BadgerMecX

EN 338:2016 · strength class, 12 % moisture reference

D65 is a hardwood strength class to EN 338:2016. Its characteristic bending strength is 65 MPa. Along the fibres E₁ = 18.5 GPa; across them E₂ = 1.23 GPa.

Record: timber-d65
Library: v1.1.0
Properties: 14
Sources: 1
Build check: passed ✓
Viewing as: guest

E₁ · Modulus, direction 1 18.5GPa mean^[1]

f_m,k · Bending strength 65MPa char^[1]

f_t,0,k · Tension parallel to grain 39MPa char^[1]

ρ · Density 900kg/m³ mean^[1]

Elastic constants

orthotropic

Symbol	Property	Value	Unit	Basis	Ref.
E₁	Modulus, direction 1 ⓘ E_0,mean, along the grain	18.5	GPa	mean	[1]
E₀,₀₅	Modulus parallel to grain, 5 % fractile	15.5	GPa	char	[1]
E₂	Modulus, direction 2 ⓘ E_90,mean, across the grain	1.23	GPa	mean	[1]
E₃	Modulus, direction 3 ⓘ E_90,mean — the standard does not separate radial and tangential	1.23	GPa	mean	[1]
G₁₂	Shear modulus 1-2 ⓘ G_mean	1.16	GPa	mean	[1]
G₁₃	Shear modulus 1-3 ⓘ G_mean	1.16	GPa	mean	[1]

Physical, thermal and electrical

at 20 °C

Symbol	Property	Value	Unit	Basis	Ref.
ρ	Density	900	kg/m³	mean	[1]
ρ_k	Density, characteristic (5 % fractile)	750	kg/m³	char	[1]

Strength

a band applies up to and including its upper limit

Symbol	Property	Value	Unit	Basis	Ref.
f_m,k	Bending strength	65	MPa	char	[1]
f_t,0,k	Tension parallel to grain	39	MPa	char	[1]
f_t,90,k	Tension perpendicular to grain	0.6	MPa	char	[1]
f_c,0,k	Compression parallel to grain	35	MPa	char	[1]
f_c,90,k	Compression perpendicular to grain	11.3	MPa	char	[1]
f_v,k	Shear strength	5	MPa	char	[1]

Notes

EN 338 and EN 14080 give no Poisson's ratios; a 3D analysis needs them from another source.

Sources

every value names one

EN 338:2016, Structural timber — Strength classes, Tables 1 and 3Copies checked: 1, 2, 3

min product standard minimum char characteristic design code value for design typical datasheet or textbook derived worked out here, formula shown

Cite this page

for reports and papers

BadgerMecX Materials (2026). D65 — material properties, EN 338:2016. Library v1.1.0, record timber-d65. https://badgermecx.com/materials/timber-d65/ (accessed 2026-10-08).

@misc{badgermecx_timberd65,
  title  = {D65 -- material properties, EN 338:2016},
  author = {{BadgerMecX Materials}},
  year   = {2026},
  note   = {Library v1.1.0, record timber-d65},
  url    = {https://badgermecx.com/materials/timber-d65/}
}

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