Wörterbuch (en): Penetration depth
de: 
Eindringtiefe (f) 
fr: 
Profondeur de pénétration (f) 
it: 
Profondità di penetrazione (f) 
es: 
Profundidad de penetración (f) 
The depth of penetration is used as a measure of the ability of an object to penetrate into an object by means of force or waves, or as a property of the object to resist penetration.