Environment Material Properties Dialog¶

This dialog displays the properties of the selected environment (terrain) material. Most numeric parameters are edited either by dragging a slider or by typing directly into the adjacent edit field; the graph is updated when Apply is clicked.

This dialog contains the following items:

Environment Material Graph¶

Graph showing the relation between force and deflection for the current material parameters.

Material Name¶

User-editable material name for the terrain at X, Y.

Friction Multiplier¶

Friction multiplier at X, Y. Dimensionless; valid range 0.0–2.0. Default is 1.0.

Macrotexture¶

Surface macrotexture depth, in inches (range 0.0–1.0 in). Used by tire-road friction (e.g., wet-road) calculations. This entry replaces the Clay Content field found in earlier versions of this dialog.

Force-Deflection Properties¶

Constant¶

Force required to initiate deflection at X, Y (lb; range 0–10,000). Default is 5,000 lb.

Linear Stiffness¶

Linear material deformation coefficient at X, Y (lb/in; range 0–1,000,000). Default is 50,000 lb/in.

Quadratic Stiffness¶

Quadratic material deformation coefficient at X, Y (lb/in²; range -2,500 to 2,500). Default is 1,000 lb/in².

Cubic Stiffness¶

Cubic material deformation coefficient at X, Y (lb/in³; range -100 to 3,500). Default is 1,000 lb/in³.

Damping Constant¶

Material velocity-dependent deformation constant at X, Y (lb-sec/in; range 0.0–5.0). Default is 0.

Unloading Slope¶

Linear unloading slope beginning at maximum deflection (lb/in; range 0–10,000,000). Default is 1,000,000 lb/in.

Soil Properties¶

Bekker Soil Exponent, N¶

Soil deformation exponent for sinkage calculations (dimensionless; range 0.0–1.0). Default is 0.

Frictional Soil Mod, Kphi¶

Frictional soil modulus for sinkage calculations (lb/in^(N+1); range 0–150). Default is 0.

Cohesive Soil Mod, Kc¶

Cohesive soil modulus for sinkage calculations (lb/in^(N+2); range 0–40). Default is 0.

Moisture Content¶

Fraction of moisture in the soil (%/100; range 0.0–1.0). Default is 0.

Buttons¶

Print¶

Prints the currently displayed graph.

Apply¶

Validates the entered values and redraws the graph with the modified values.

New¶

Resets the dialog to the default environment material ("Default Environment Material") with the default values listed above.

Open...¶

Opens an environment material from an HVE Material file (*.matl) in the environment materials directory.

Save As...¶

Saves the current material settings to an HVE Material file (*.matl) for later reuse.

OK / Cancel¶

OK validates and accepts the material; Cancel discards the changes.

Source topic: EnvrMatPropDlg.htm — updated from source code (HVEINV-64, Physics) 2026-07-05.

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