Vvc (Core Void Volume) | Area Roughness Parameters - Keyence

Introduction to "Roughness" produced by KEYENCE

• What is line roughness?

  • What is Surface Roughness?
  • Surface Roughness Terminology
  • Understanding Surface Roughness Symbols
  • Measuring Procedure for Stylus-type Surface Roughness Instruments
  • Surface Roughness Parameters

• What is area roughness?

  • What is surface area roughness?
  • Surface (area) roughness terminology
  • Evaluation Processing and Filtering
  • Area Roughness Parameters
  • Surface Roughness Standards: ISO 25178 vs. JIS B 0601-2001

• Instruments used for roughness measurements

  • ■ Line roughness
  • Contact-type Surface Roughness/Profile Measuring Instruments
  • Non-contact Surface Roughness/Profile Measuring Instruments
  • ■ Area roughness
  • Side-by-side Comparison of Roughness Measuring Instruments
  • Contact-type Surface Roughness/Profile Measuring Instruments
  • Atomic Force Microscopes (AFM)
  • White light interferometers
  • Profile-Measuring Laser Microscopes
  • Wide-area 3D profile-measuring instrument

• Roughness measurement examples

Home > What is area roughness? > Area Roughness Parameters

Vvc (Core Void Volume) | Area Roughness Parameters

Description of surface texture parameters in ISO 25178

• Height
• Spatial
• Hybrid
• Functional
• Functional volume
• Feature

• Sa (arithmetical mean height)
• Sz (Maximum height)
• Sq (Root mean square height)

• Ssk (Skewness)
• Sku (Kurtosis)
• Sp (Maximum peak height)

• Sv (Maximum pit height)

• Sal (Auto-correlation length) / Str (Texture aspect ratio)
• Std* (Texture direction)

• Sdq (Root mean square gradient)
• Sdr (Developed interfacial area ratio)

• 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)

• Vvv (Dale void volume)
• Vvc (Core void volume)
• Vmp (Peak material volume)

• Vmc (Core material volume)

• Spd (Density of peaks)
• Spc (Arithmetic mean peak curvature)
• S10z / S5p / S5v / Sda(c) / Sha(c) / Sdv(c) / Shv(c)

Find from the parameter list

Vvc (Core Void Volume)

Vvc (core void volume) represents the difference between the void volume at areal material ratio p% and the void volume at areal material ratio q%. It can also be used to quantify the magnitude of the core surface, reduced peaks, and reduced valleys based on volume parameters.

Vmp, Vmc, Vvc, and Vvv represent the volumes of the reduced peaks, core material, core void, and valley void respectively.

To use volume parameters, the areal material ratio values that divide the reduced peaks and reduced valleys from the core surface must be specified. By default, 10% and 80% are used.

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 (Maximum pit height)
Spatial	Sal (Auto-correlation length) / Str (Texture aspect ratio)
	Std* (Texture direction)
Hybrid	Sdq (Root mean square gradient)
	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)

"What is area roughness?" page list

• • What is surface area roughness?
  • Surface (area) roughness terminology
  • Evaluation Processing and Filtering
  • Area Roughness Parameters
  • Surface Roughness Standards: ISO 25178 vs. JIS B 0601-2001

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