Difference between revisions of "Crack"
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| − | [[File:72.4167-C34491CR-d1.jpg|thumb| | + | [[File:72.4167-C34491CR-d1.jpg|thumb|Crack bear carving<br>MFA# 72.4167]] |
== Description == | == Description == | ||
| − | + | [[File:72.4732-SC78702_RL .jpg|thumb|Crack in coffin face<br>MFA# 72.4732]] | |
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. | 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. | ||
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crevice; chink; gap; cleft; fissure; fracture; cleavage; separation | crevice; chink; gap; cleft; fissure; fracture; cleavage; separation | ||
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== Additional Images == | == Additional Images == | ||
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<gallery> | <gallery> | ||
File:DT 8-25-2004-Crack detail|Crack detail | File:DT 8-25-2004-Crack detail|Crack detail | ||
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File:Craquele_ICOMOS.jpg|Craquelure | File:Craquele_ICOMOS.jpg|Craquelure | ||
</gallery> | </gallery> | ||
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| + | ==Resources and Citations== | ||
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| + | * ICOMOS-ISCS: [http://www.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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| + | * 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] | ||
[[Category:Materials database]] | [[Category:Materials database]] | ||
Revision as of 14:12, 6 July 2022
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
Additional Images
- DT 8-25-2004-Crack detail
Crack detail
Star crack
Hair crack
Craquelure
Resources and Citations
- ICOMOS-ISCS: 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" Part 1, Structural Response to Relative Humidity and Part 2, Structural Response to Temperature