Added stiffness units to FreeCAD [mN/m, N/m, kN/m, MN/m]

src/Mod/Material/StandardMaterial/TEMPLATE.FCMat

@@ -92,6 +92,10 @@ YieldStrength =
 ; https://en.wikipedia.org/wiki/Young%27s_modulus
 YoungsModulus =
 
+; Stiffness (or Spring Stiffness) in [FreeCAD Stiffness unit]
+; https://en.wikipedia.org/wiki/Stiffness
+Stiffness =
+
 
 [Thermal]
 ; Specific capacity in [FreeCAD SpecificHeat unit]

src/Mod/Material/Templatematerial.yml

@@ -138,6 +138,10 @@
       Type: 'Quantity'
       URL: 'https://en.wikipedia.org/wiki/Young%27s_modulus'
       Description: "Young's modulus (or E-Module) in [FreeCAD Pressure unit]"
+    Stiffness:
+      Type: 'Quantity'
+      URL: 'https://en.wikipedia.org/wiki/Stiffness'
+      Description: "Stiffness (or Spring Stiffness) in [FreeCAD Stiffness unit]"
 - Thermal:
     SpecificHeat:
       Type: 'Quantity'