Difference between revisions of "Crack"

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== Description ==
 
== Description ==
  
A visible separation on a surface that extends through one or more layers. Cracks may be due to stress, pressure, temperatures, or humidity variations or mechanical defects. Cracks are described by the size (hairline, wide) and direction (parallel, radial, spiral, etc.).  See for eaxample [http://cameo.mfa.org/materials/fullrecord.asp?name=crackle crackle] and [http://cameo.mfa.org/materials/fullrecord.asp?name=crazing crazing].  Geologic terms for cracks include fault, gap, fracture, and fissure.  A crack in a textile is mechanical defect due to a missing filling thread.
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A visible separation on a surface that extends through one or more layers. Cracks may be due to stress, pressure, temperatures, or humidity variations or mechanical defects. Cracks are described by the size (hairline, wide) and direction (parallel, radial, spiral, etc.).  See for example [[crackle]] and [[crazing]].  Geologic terms for cracks include fault, gap, fracture, and fissure.  A crack in a textile is mechanical defect due to a missing filling thread.
  
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
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== Additional Information ==
 
== Additional Information ==
  
ICOMOS Stone dedegradation terms may be found at: [http://cameo.mfa.org/materials/ http://international.icomos.org/publications/monuments_and_sites/15/pdf/Monuments_and_Sites_15_ISCS_Glossary_Stone.pdf Illustrated glossary on stone deterioration patterns]   For information on cracks caused by humidity and temperature see: M.F. Mecklenburg, Smithsonian Museum Conservation Institute, "Determining the Acceptable Ranges of Relative Humidity And Temperature in Museums and Galleries" [http://cameo.mfa.org/materials/ http://www.si.edu/mci/downloads/reports/Mecklenburg-Part1-RH.pdf Part 1, Structural Response to Relative Humidity] and [http://cameo.mfa.org/materials/ http://www.si.edu/mci/downloads/reports/Mecklenburg-Part2-Temp.pdf Part 2, Structural Response to Temperature]
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º ICOMOS Stone dedegradation terms may be found at: [http://international.icomos.org/publications/monuments_and_sites/15/pdf/Monuments_and_Sites_15_ISCS_Glossary_Stone.pdf Illustrated glossary on stone deterioration patterns]
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º For information on cracks caused by humidity and temperature see: M.F. Mecklenburg, Smithsonian Museum Conservation Institute, "Determining the Acceptable Ranges of Relative Humidity And Temperature in Museums and Galleries" [http://www.si.edu/mci/downloads/reports/Mecklenburg-Part1-RH.pdf Part 1, Structural Response to Relative Humidity] and [http://www.si.edu/mci/downloads/reports/Mecklenburg-Part2-Temp.pdf Part 2, Structural Response to Temperature]
  
 
== Additional Images ==
 
== Additional Images ==

Revision as of 11:45, 2 May 2016

MFA Acc. #: 72.4167

Description

A visible separation on a surface that extends through one or more layers. Cracks may be due to stress, pressure, temperatures, or humidity variations or mechanical defects. Cracks are described by the size (hairline, wide) and direction (parallel, radial, spiral, etc.). See for example Crackle and Crazing. Geologic terms for cracks include fault, gap, fracture, and fissure. A crack in a textile is mechanical defect due to a missing filling thread.

Synonyms and Related Terms

crevice; chink; gap; cleft; fissure; fracture; cleavage; separation

MFA Acc. #: 72.4732

Additional Information

º ICOMOS Stone dedegradation terms may be found at: Illustrated glossary on stone deterioration patterns

º For information on cracks caused by humidity and temperature see: M.F. Mecklenburg, Smithsonian Museum Conservation Institute, "Determining the Acceptable Ranges of Relative Humidity And Temperature in Museums and Galleries" Part 1, Structural Response to Relative Humidity and Part 2, Structural Response to Temperature

Additional Images

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