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Brott (mekanik) - Versionshistorik
2026-11-07T10:29:49Z
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https://wiki.guldforum.se/w/index.php?title=Brott_(mekanik)&diff=12604&oldid=prev
Dan Olsson den 2 mars 2013 kl. 16.50
2013-03-02T16:50:51Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Versionen från 2 mars 2013 kl. 11.50</td>
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Dan Olsson
https://wiki.guldforum.se/w/index.php?title=Brott_(mekanik)&diff=10794&oldid=prev
Dan Olsson: 1 version
2013-02-25T15:31:18Z
<p>1 version</p>
<p><b>Ny sida</b></p><div>: ''Denna artikel handlar om den mekaniska termen brott. Se också [[Brott (olika betydelser)]]''.<br />
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Ett '''brott''' är en bristning i ett [[fast]] [[material]], och som uppkommer när en pålagd kraft orsakar [[mekanisk spänning|spänning]] i materialet. Brott sker när den tillförda [[energi|energin]] är lika med energin som frisläpps i samband med brottet. Beroende på materialets egenskaper kan brottet bli ett '''sprödbrott''' eller ett '''segbrott'''. Vid ett segbrott [[Deformation|deformeras]] materialet innan brottet sker, som ett [[tuggummi]] som dras ut och sedan brister. Vid ett sprödbrott sker brottet utan deformation, som när en [[polkagris]]stång bryts av.<br />
<br />
Ett brott uppkommer vanligen kring någon form av defekt i materialet, där spänningarna blir extra stora. Defekten kan vara en svag punkt i materialets [[kristallstruktur]], en [[por]] i materialet, en skarv eller något annat. [[Brottspänning]]ar bildas runt svagheten, som utvecklas till en spricka, där sedan den kritiska spänningen kan leda till ett brott.<br />
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==Brottmekaniska egenskaper==<br />
För att definiera ett materials brottmekaniska egenskaper beräknar man bland annat:<br />
* Kritiska spänningsintensitetsfaktorn, K<sub>IC</sub><br />
* [[Hållfasthetslära|Draghållfastheten]]<br />
<br />
==Se även==<br />
* [[Spricka]]<br />
*[[Brottanvisning]]<br />
<br />
{{mekanikstub}}<br />
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[[Kategori:Hållfasthetslära]]<br />
[[Kategori:Mekanik]]<br />
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[[ar:ميكانيكا تصدع]]<br />
[[de:Bruchmechanik]]<br />
[[en:Fracture mechanics]]<br />
[[es:Mecánica de la fractura]]<br />
[[fa:مکانیک شکست]]<br />
[[fr:Mécanique de la rupture]]<br />
[[it:Meccanica della frattura]]<br />
[[he:מכניקת השבר]]<br />
[[ja:破壊力学]]<br />
[[pl:Mechanika pękania]]<br />
[[pt:Mecânica da fratura]]<br />
[[ru:Механика разрушения твёрдых тел]]<br />
[[fi:Murtumismekaniikka]]<br />
[[uk:Механіка руйнування]]<br />
[[zh:断裂力学]]</div>
Dan Olsson