Tools for Research

Composite Property Calculator

Estimate direction-wise elastic constants, tensile and compressive strengths, density, thermal expansion and specific heat for a unidirectional fiber–matrix composite.

Complete

Infer missing isotropic constants from any valid pair of E, G, ν and K.

Calculate

Use transparent Voigt, Reuss and mass-weighted mixture equations.

Export

Create a CSV report and Abaqus engineering-constants material card.

Calculations run locally. Missing constituent inputs are ignored only for their dependent properties; no hidden values are substituted.

Composite material nameFiber volume fraction

Void volume fraction

Decimal places

Vf 60.00%Vm 40.00%Vvoid 0.00%

Homogenization method used for results and Abaqus export

Direct Rule of Mixtures (Voigt) axially and inverse Rule of Mixtures (Reuss) transversely

Halpin–Tsai ξ, transverse

Halpin–Tsai ξ, shear

Referenced material database

Manufacturer and scientific-source presets; review applicability before use.

Select material

Carbon fiber

Hexcel IM7 carbon fiber

Transversely isotropic engineering approximation. Longitudinal strength and density are manufacturer values; transverse constants follow the cited micromechanics property table.

Plasticity: Not supplied: continuous carbon fiber is treated as elastic-brittle, not metal-plastic.

HexTow IM7 Carbon Fiber product data sheet IM7 fiber and RTM6 epoxy thermo-elastic property table

Fiber properties

Elastic constants (enter any two)

Young's modulus E

MPa

Shear modulus G

MPa

Poisson ratio ν

Bulk modulus K

MPa

Physical and thermal

Density ρ

kg/m³

Thermal expansion α

×10⁻⁶/K

Specific heat cₚ

J/(kg·K)

Strength

Tensile yield/strength

MPa

Compressive yield/strength

MPa

Elastic completion: using Enu; inferred G, K.

Matrix properties

Elastic constants (enter any two)

Young's modulus E

MPa

Shear modulus G

MPa

Poisson ratio ν

Bulk modulus K

MPa

Physical and thermal

Density ρ

kg/m³

Thermal expansion α

×10⁻⁶/K

Specific heat cₚ

J/(kg·K)

Strength

Tensile yield/strength

MPa

Compressive yield/strength

MPa

Elastic completion: using Enu; inferred G, K.

Results are up to date

The comparison chart and Abaqus export use the last calculated inputs.

Engineering constants

E₁

139400.00 MPa

E1 = V_fE1_f + V_mE1_m

E₂

8554.73 MPa

1/E2 = V_f/E2_f + V_m/E2_m

E₃

8554.73 MPa

1/E3 = V_f/E3_f + V_m/E3_m

G₁₂

3176.29 MPa

1/G12 = V_f/G12_f + V_m/G12_m

G₁₃

3176.29 MPa

1/G13 = V_f/G13_f + V_m/G13_m

G₂₃

3176.29 MPa

1/G23 = V_f/G23_f + V_m/G23_m

ν₁₂

0.26

ν12 = V_fν12_f + V_mν12_m

ν₁₃

0.26

ν13 = V_fν13_f + V_mν13_m

ν₂₃

0.26

ν23 = V_fν23_f + V_mν23_m

ν₂₁

0.02

ν₂₁ = ν₁₂E₂/E₁

Direction-wise yield/strength estimates

Xₜ — tension, direction 1

2128.00 MPa

direction-1 tensile yield/strength direct Rule of Mixtures

X꜀ — compression, direction 1

1128.00 MPa

direction-1 compressive yield/strength direct Rule of Mixtures

Yₜ — tension, direction 2

169.90 MPa

direction-2 tensile yield/strength inverse Rule of Mixtures

Y꜀ — compression, direction 2

272.73 MPa

direction-2 compressive yield/strength inverse Rule of Mixtures

Zₜ — tension, direction 3

169.90 MPa

direction-3 tensile yield/strength inverse Rule of Mixtures

Z꜀ — compression, direction 3

272.73 MPa

direction-3 compressive yield/strength inverse Rule of Mixtures

Density and thermal properties

Composite density

1560.00 kg/m³

ρ_c = V_fρ_f + V_mρ_m

α₁

0.06 ×10⁻⁶/K

α1 = (V_fE1fα1f + V_mE1mα1m)/(V_fE1f + V_mE1m)

α₂

0.06 ×10⁻⁶/K

α2 = (V_fE2fα2f + V_mE2mα2m)/(V_fE2f + V_mE2m)

α₃

0.06 ×10⁻⁶/K

α3 = (V_fE3fα3f + V_mE3mα3m)/(V_fE3f + V_mE3m)

Specific heat cₚ

830.00 J/(kg·K)

c_p,c = w_fc_p,f + w_mc_p,m; w_i = V_iρ_i/ρ_c

Volumetric heat capacity

1294800.00 J/(m³·K)

C_v = ρ_cc_p,c

Inputs are internally consistent

Engineering constants

E₁

139400.00 MPa

E1 = V_fE1_f + V_mE1_m

E₂

8554.73 MPa

1/E2 = V_f/E2_f + V_m/E2_m

E₃

8554.73 MPa

1/E3 = V_f/E3_f + V_m/E3_m

G₁₂

3176.29 MPa

1/G12 = V_f/G12_f + V_m/G12_m

G₁₃

3176.29 MPa

1/G13 = V_f/G13_f + V_m/G13_m

G₂₃

3176.29 MPa

1/G23 = V_f/G23_f + V_m/G23_m

ν₁₂

0.26

ν12 = V_fν12_f + V_mν12_m

ν₁₃

0.26

ν13 = V_fν13_f + V_mν13_m

ν₂₃

0.26

ν23 = V_fν23_f + V_mν23_m

ν₂₁

0.02

ν₂₁ = ν₁₂E₂/E₁

Direction-wise yield/strength estimates

Xₜ — tension, direction 1

2128.00 MPa

direction-1 tensile yield/strength direct Rule of Mixtures

X꜀ — compression, direction 1

1128.00 MPa

direction-1 compressive yield/strength direct Rule of Mixtures

Yₜ — tension, direction 2

169.90 MPa

direction-2 tensile yield/strength inverse Rule of Mixtures

Y꜀ — compression, direction 2

272.73 MPa

direction-2 compressive yield/strength inverse Rule of Mixtures

Zₜ — tension, direction 3

169.90 MPa

direction-3 tensile yield/strength inverse Rule of Mixtures

Z꜀ — compression, direction 3

272.73 MPa

direction-3 compressive yield/strength inverse Rule of Mixtures

Density and thermal properties

Composite density

1560.00 kg/m³

ρ_c = V_fρ_f + V_mρ_m

α₁

0.06 ×10⁻⁶/K

α1 = (V_fE1fα1f + V_mE1mα1m)/(V_fE1f + V_mE1m)

α₂

0.06 ×10⁻⁶/K

α2 = (V_fE2fα2f + V_mE2mα2m)/(V_fE2f + V_mE2m)

α₃

0.06 ×10⁻⁶/K

α3 = (V_fE3fα3f + V_mE3mα3m)/(V_fE3f + V_mE3m)

Specific heat cₚ

830.00 J/(kg·K)

c_p,c = w_fc_p,f + w_mc_p,m; w_i = V_iρ_i/ρ_c

Volumetric heat capacity

1294800.00 J/(m³·K)

C_v = ρ_cc_p,c