Area Roughness Parameters

Description of surface texture parameters in ISO 25178

Height
Spatial
Hybrid
Functional
Functional volume
Feature

Sv(马克西mum pit height)

Vmc (Core material volume)

Sxp (Peak extreme height)

Sxp (peak extreme height) is the difference of heights at the areal material ratio values p% and q%. The areal material ratio curve is used for the calculation of Sxp.

Sxp represents the difference in the height between the average plane and peaks on the surface after especially high peaks on the surface are removed. By default, it is the height difference between the areal material ratio values 2.5% and 50%.

Sxp (Peak extreme height)

Find from the parameter list

Height	Sa (arithmetical mean height)
	Sz (Maximum height)
	Sq (Root mean square height)
	Ssk (Skewness)
	Sku (Kurtosis)
	Sp (Maximum peak height)
	Sv(马克西mum pit height)
Spatial	Sal (Auto-correlation length) / Str (Texture aspect ratio)
Spatial	Std* (Texture direction)
Hybrid	Sdq (Root mean square gradient)
Hybrid	Sdr (Developed interfacial area ratio)
Functional	Smr(c) Areal material (bearing area) ratio
	Smc(mr) Inverse areal material ratio
	Sk(Core height)
	Spk (Reduced peak height)
	Svk (reduced dale height (reduced valley depth))
	Smr (Peak material portion)
	Smr2 (Valley material portion)
	Sxp (Peak extreme height)
Functional volume	Vvv (Dale void volume)
	Vvc (Core void volume)
	Vmp (Peak material volume)
	Vmc (Core material volume)
Feature	Spd (Density of peaks)
	Spc (Arithmetic mean peak curvature)
	S10z / S5p / S5v / Sda(c) / Sha(c) / Sdv(c) / Shv(c)

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