Wikidata:Property proposal/surface roughness

surface roughness edit

Originally proposed at Wikidata:Property proposal/Natural science

Done: surface roughness (P7083) (Talk and documentation)

Description	component of surface texture quantified by the deviations in the direction of the normal vector of a real surface from its ideal form
Represents	surface roughness (Q114817)
Data type	Quantity
Template parameter	This proprety request is part of the project of creating an infobox for materials
Domain	Mechanical property of all solid Materials
Allowed values	Any number. Qualifiers : relative to (P2210) (mandatory) + others depending on the use
Example 1	Q62034144 : surface roughness (Pxxx) → 50 µm relative to (P2210) → Ra (Q55776776)
Example 2	Q62034144 : surface roughness (Pxxx) → 200 µm relative to (P2210) → Rt (Q55776788)
Example 3	stainless steel (Q172587) : coefficient of friction (P5575) → 0,3 with qualifiers surface roughness (Pxxx) → 3,2 µm and relative to (P2210) → Ra (Q55776776)
Source	w:Surface roughness
Planned use	Creating an infobox for materials

Motivation

This proprety request is part of the project of creating an infobox for materials. To be used as a qualifier for properties such as coefficient of friction, fatigue limit or corrosion resistance. It could also be used as a standalone property for parts, measuring methods, standards or manufacturing processes such as abrasive blasting (Q917273) with qualifier like the granularity of sand, the velocity and the material. It could also be a geologic property referring to soil surface roughness.

Discussion

Support David (talk) 07:36, 28 July 2018 (UTC)[reply]
Support @Thibdx: are you still interested in this? If so could you add qids in the examples so that we can create this? If not, please use |status=withdrawn. − Pintoch (talk) 20:35, 6 March 2019 (UTC)[reply]

Hi, @Pintoch:. Added. I'm still interested in this. However now that I have a deeper understanding of Wikidata I'm turning partisan of having more properties but that represent exact scientific concepts and that are not a hood for several measures. In the example 3 the surface roughness is used as a qualifier. But since surface rougness is a general concept and not an exact measure, we need to add the type of measure that was used. The most used is the Ra (Arithmetical mean deviation of the assessed profile). There is also the Rv (Maximum valley depth), Rp (Maximum peak height), Rt (Maximum Height of the Profile), Rz (Average distance between the highest peak and lowest valley in each sampling length)... The problem is that since surface rugosity is used as a qualifier, we cannot add a qualifier of a qualifier to enforce the precision needed. In my opinion this model make general "hood" properties very weak in the context of Wikidata. The molecular biology project had exactly the same problem. First they used the general property physically interacts with (P129) with qualifiers to specify all sort of interactions. For example, if a molecule is an agonist or an antogonist of the target receptor. Then they created the properties agonist of (P3772), antagonist of (P3773), activator of (P3771), disrupting agent for (P3775), inhibitor of (P3776), antisense inhibitor of (P3777), positive allosteric modulator of (P3778), negative allosteric modulator of (P3779)... Now it is a mess in the datasets because some items use the old way and some use the new way... I know that some admins are pushing to limit the number of properties but being not precise enough seems to raise problems in the long term. It is the core problematic in industry, where we have to deal with the hard reality of physics instead of simple concepts. A basic example : many engineers don't know the types of stainless steels. But a martensitic stainless steel react catastrophically to thermo/chemical treatments designed for austenitic stainless steels... I think that we need a general policy at Wikidata level to design properties that have the good level of details. In order to avoid specific details that would only be raised on a couple of items but enough detailled to represent something that is scientifically measured. --Thibdx (talk) 22:14, 12 March 2019 (UTC)[reply]

@Thibdx, ديفيد عادل وهبة خليل 2: Done: surface roughness (P7083). − Pintoch (talk) 21:15, 23 July 2019 (UTC)[reply]