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- To: seaoc(--nospam--at)seaoc.org
- Subject: 5 Thanks for responses (Granite's Modulus of Elasticity)
- From: "K. Hemmatyar" <kch(--nospam--at)ultranet.ca>
- Date: Tue, 28 Apr 1998 19:42:16 -0700 (PDT)
- Cc: John Nichols <cejn(--nospam--at)engmail.newcastle.edu.au>, NRoselund <NRoselund(--nospam--at)aol.com>, Brent Koch <brentk(--nospam--at)tdl.com>, ichard Lewis <rlewis(--nospam--at)techteam.org>, Allan Hickey <ahickey(--nospam--at)hotkey.net.au>
Thanky you all kindly for your helps. Kasey Hemmatyar, P. Eng. (structural) Vancouver, B.C. _____________________message separator________________ At 10:28 AM 4/28/98 +1000, you wrote: >Dear K Hemmatyar, > >The Young's modulus is the intrinsic property of an undamaged material. It >is constant. Usually measured between teh 15 to 85 percentile results in a >tension or compression test. The closure of micro cracks will cause a >higher E in compression that is now handled in Damage mechanics with a h >value of 0.2 to 0.3 >ie multiply tensil E by this to get compressive. > >The Young's modulus for Salem sandstone is in the order of 25 to 50 Giga >Pascals (sorry i never learnt English Units I'm from Aussie land.) > >I have recently measured E for bricks at a range of 5 to 55 GPa. This range >is for same bricks in some cases. Natural materials even manufactured >bricks are not linearly elastic as exactly as Hooke's Law would suggest. > >The Modulus of Elasticity is a measurement of teh Young's Modulus at a >particular point in time and sapce after material has been subject to >loading. It is only the same for purely ealstic materials or undamaged >materials. > >One measures E on a representative sample For granite your are probably >looking at the same as concrete about a 100 mm cubed to get a continuum >measurmement > >If you are using the results remember >Micro results are effected by the test method so they may be high. > >Meso results apply to small areas like an area beneath a building. In hte >modelling I do at this scale I allow an E of about 10-20 GPa. The material >is goiong to be cracked and splintered. Your problem is what you are using >the modelling for if it is for a dynamic analysis of a building I would use >10 to 20. > >If it is for a material to be used in a building I would get it measured at >a good lab. I would send it to Abrams in Urbana. If you are using mortar >in between it will have an E of 1 GPa tops. This will affect the results >depending on the thickness of the two materials. DAvidge book on ceramics >has a formula to solve this problem I can send it to you if you like. > >Failing that I would ask the Coloroda School of Mines I think thats it. >Actually I would ask them anyway. > >John Nichols > >I trust this helps. > >F >seaoc(--nospam--at)seaoc.org,Internet writes: >1. Does any one know what is the Granite's Modulus of elasticity (roughly) >or where can I get it? (it is Sunday!) > >2. Question: Modulus of Elastisity and Young's Modulus is the same but >does "Modulus of Rupture" refer to the same property? > >Thanks > >K. Hemmatyar, P. Eng. (structural) >Vancouver, B.C. > > >Reference "SOIL MECHANICS" by Lambe and Whitman > >Modulus of elasticity ranges from 10.6 to 12.5 x 10^6 psi > >Modulus of rupture os a different property. I can't find it in a text but if >you recall for concrete modulus of elasticity is 57,000*SQRT(f'c) and modulus >of rupture is 7.5*SQRT(f'c) > > >__________________________________________________ > >Richard Lewis, P.E. >Missionary TECH Team >rlewis(--nospam--at)techteam.org > >The service mission like-minded Christian organizations >may turn to for technical assistance and know-how. > >
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