Timber · Solid timber, hardwood · orthotropic

D70

Name: D70 — material properties (EN 338:2016)
Creator: BadgerMecX

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

D70 is a hardwood strength class to EN 338:2016. Its characteristic bending strength is 70 MPa. Along the fibres E₁ = 20 GPa; across them E₂ = 1.33 GPa.

Record: timber-d70
Library: v1.1.0
Properties: 14
Sources: 1
Build check: passed ✓
Viewing as: guest

E₁ · Modulus, direction 1 20GPa mean^[1]

f_m,k · Bending strength 70MPa char^[1]

f_t,0,k · Tension parallel to grain 42MPa char^[1]

ρ · Density 960kg/m³ mean^[1]

Elastic constants

orthotropic

Symbol	Property	Value	Unit	Basis	Ref.
E₁	Modulus, direction 1 ⓘ E_0,mean, along the grain	20	GPa	mean	[1]
E₀,₀₅	Modulus parallel to grain, 5 % fractile	16.8	GPa	char	[1]
E₂	Modulus, direction 2 ⓘ E_90,mean, across the grain	1.33	GPa	mean	[1]
E₃	Modulus, direction 3 ⓘ E_90,mean — the standard does not separate radial and tangential	1.33	GPa	mean	[1]
G₁₂	Shear modulus 1-2 ⓘ G_mean	1.25	GPa	mean	[1]
G₁₃	Shear modulus 1-3 ⓘ G_mean	1.25	GPa	mean	[1]

Physical, thermal and electrical

at 20 °C

Symbol	Property	Value	Unit	Basis	Ref.
ρ	Density	960	kg/m³	mean	[1]
ρ_k	Density, characteristic (5 % fractile)	800	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	70	MPa	char	[1]
f_t,0,k	Tension parallel to grain	42	MPa	char	[1]
f_t,90,k	Tension perpendicular to grain	0.6	MPa	char	[1]
f_c,0,k	Compression parallel to grain	36	MPa	char	[1]
f_c,90,k	Compression perpendicular to grain	12	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). D70 — material properties, EN 338:2016. Library v1.1.0, record timber-d70. https://badgermecx.com/materials/timber-d70/ (accessed 2026-10-08).

@misc{badgermecx_timberd70,
  title  = {D70 -- material properties, EN 338:2016},
  author = {{BadgerMecX Materials}},
  year   = {2026},
  note   = {Library v1.1.0, record timber-d70},
  url    = {https://badgermecx.com/materials/timber-d70/}
}

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