HJC (Holmquist-Johnson-Cook) Concrete Model Calculator

σ* = (A + B·P*N)·(1 + C·ln ε̇*) where: σ* — normalised equivalent stress, P* — normalised pressure,
ε̇* — dimensionless strain rate, A, B, C, N — strength surface constants
Young's Modulus
E
—
MPa
Shear Modulus
G
—
MPa
Tensile Strength
ft
—
MPa
Crush Pressure
Pcrush
—
MPa
EOS Linear Param.
K1
—
MPa
Max Tension
T
—
MPa
Warning:

Reference

Ren G-M, Wu H, Fang Q, Kong X-Z. Parameters of Holmquist–Johnson–Cook model for high-strength concrete-like materials under projectile impact. International Journal of Protective Structures. 2017;8(3):352-367.

https://doi.org/10.1177/2041419617721552

This study provides empirical correlations for HJC model parameters based on extensive testing of high-strength concrete materials (67.5–157 MPa) under projectile impact conditions, enabling automatic parameter generation from basic material properties.