what is the in plane bending stiffness of graphite?
364416
You can't compare it like that.  The value you quoted is for just one tube.  There's not such thing as a tube of graphite.  You want to compare the inplane stiffness.  I'm too lazy to look up the numbers for you.
1055779
1 ksi = 1000 psi\n\nWhat do your points represent and how did you get that answer?\n\nLater...\nE= stress * length/deflection, or force*length/(deflection*area)\nIf the tester was zeroed, your result is non-linear - .004 deflection for the first 150# and .006 for the next 150#. Could indicate yielding - or slipping. If you're sure of your work, check the data and the setup.
238500
need to know the type of metal, then find the shear force & plug it into your equation.  don't forget to factor in each thread  (Basic solid mechanics)
701453
You can find it using the general bending formula as related to torsion (twisting) rather than bending.\n\nT/j = G/Theta x L = Shear stess/Radius\n \nThe folowing link explains much better than I can.\n\nhttp://www.freestudy.co.uk/c105.htm
1070119
i think you can get a lot of this info rmation to clerar your doubts\n\nhttp://www.calce.umd.edu/general/Facilities/Hardness_ad_.htm
952538
Yes, you can use it... the HB 2 is the key.... that is telling you the hardness of the graphite and a #2 = HB2.\n\nGood luck on your test!!!!
973382
Lucky you, you just stuck yourself with graphite, not lead.  Hurtz, donut?
326124
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998010
Better than that, look up some standard tables, be careful with the yarn, SiC is extremely hard.
361455
This question is both complex and easy; easy because the way to illustrate or model the shear stresses in a beam requires a simple diagram that cannot be drawn on here, and easy because once you see the procedure you will realize it is actually quite straightfoward. \n\nThe best thing for you to do is grab a Materials' Engineering book -- most will have, at some point, an accurate answer to this question.  Try your mechanics and dynamics books too, as this bordelines on many subjects.
811801
hi!\nGo through these links. hope you will get useful information\n\nhttp://composite.about.com/od/books/\nhttp://composite.about.com/od/referencematerials/l/aa040797.htm\nhttp://composite.about.com/library/weekly/aa051297.htm
928985
Carbon in its hardest form
65681
None we know of, but keep in mind that the PRESSURE at the earth's core is greater than any pressure we have been able to reproduce, so we don't know for sure the behavior of melting points there. It may be no different. The highest known melting point is for graphite at 6,646.5 F. That's about half the estimated temperature of the core.
1090965
http://www.indiaxpress.com/au/coe/dept/met/Metallurgical_Engg_Catalog.pdf\n\nhttp://engineering-services.globalspec.com/Industrial-Directory/tester_model\n\nor google "poldi hardness testing principle"
812339
Chrome-moly steel has a density of 7.9g/cc, with an ultimate strength of 520MPa, and a modulus of 200GPa. \n\nTitanium (Ti3Al2.5v) has a density of 4.48g/cc, ultimate strength of 620Mpa, and modulus of 100GPa. \n\nThis means that the titanium is a lot lighter (over 40%), a little stronger (20%), but less stiff (by 50%). A titanium frame will flex a bit more than a steel frame, but that acts as a shock dampener and makes the ride a lot more comfortable. \n\nAluminum (assuming generic) has a density of about 2.8g/cc, ultimate strength of 425MPa, and a modulus of 73GPa. \n\nSo aluminum is actually a lot lighter than titanium, but it is weaker and less stiff (more flexible). \n\nHowever, these numbers are bulk properties, and do not take into account design differences with bike frames. A titanium bike frame will usually be lighter than an aluminum bike frame because you don't have to use as much metal to get the same strength and stiffness with titanium as you would have to do with aluminum and steel. \n\nIt's a LOT more expensive, so unless this is for a racing bicycle, a titanium frame will not be worth the expense.
1103413
Most boards at the minute are made of 5 or 7 ply Canadian Maple. which is pressed into shape and given a concave for added strenght, and then coated to give it a smooth finish,\n\nas for the future. i have to agree ^^^^^^ Carbon fibre is amazing, but at this moment in time, its hella expensive!
101115
It is depended on the moment and the surface moments if inertia of cross section of cantilever.\n\nMoment is force time distance : M=r*f\n\nand I is used to show surface moments if inertia.\n\nthe more the moment more is the deflection.\nthe more the I less is the deflection.