The University of Hong Kong Department of Civil Engineering CIVL2002 M – Geology & Rock Laboratory Report Brazilian Test A. Introduction As shown by the Griffith criterion‚ tensile strength of brittle materials is theoretical 1/8 of the compressive strength. Typically‚ tensile strength of rock materials is about 1/10 to 1/8 of the compressive strength. Hence‚ rock fails easily under tension. In design‚ rock should be subjected to minimum tensile stress. Several methods
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stress and average shear stress of a body subject to axial forces and shear forces respectively – Calculate the normal strain from a body`s deformation – Understand and be able to apply the relationship between stress and strain. – Locate and identify material characteristics associated with a tensile test stress-strain diagram – Solve the problems of modulus of elasticity‚ modulus of rigidity and poisson`s ratio – Calculate a factor of safety‚ axial strain and lateral strain 7/7/2014 1 Chapter 1
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Osteoporosis ("porous bones"‚ from Greek: οστούν/ostoun meaning "bone" and πόρος/poros meaning "pore") is a progressive bone disease that is characterized by a decrease in bone mass and density which can lead to an increased risk of fracture.[1] In osteoporosis‚ the bone mineral density (BMD) is reduced‚ bone microarchitecture deteriorates‚ and the amount and variety of proteins in bone are altered. Osteoporosis is defined by the World Health Organization (WHO) as a bone mineral density of 2.5 standard
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UU test on datasheet 3. Deviator stress and excess pore pressure vs. axial strain Above we can see the plots of both excess pore pressure and deviator stress against axial strain. These results are typical of a consolidated undrained test for normally consolidated clays. The maximum deviator stress that occurred was 76.21kPa which results in a strain of 0.18. The excess pore pressure increases linearly with axial strain which can be seen clearly on the graph above. 4. Mohr’s circles
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Design of Waste Heat Boiler 1.00 Introduction: It is a High Pressure & High Temperature exchanger to transfer heat from synthesis gas of Ammonia and generate high pressure steam from boiler feed water. Such exchangers are being designed as per International Codes viz. ASME Section VIII‚ Div-2 an American code or AD Markbleter a German code. Since it is generating steam on shell side‚ the shell is also to be designed as per IBR (Indian Boiler Regulation) code. In India and other foreign
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Diametral Pitch – ratio of number of teeth in the gear to the pitch diameter. Pd = N/D Forces on Helical Gear Tooth More Pitches • Normal Diametral Pitch – diametral pitch in normal direction Pnd = Pd / cos ψ • Axial Pitch – distance between corresponding points on adjacent teeth measured in the axial direction. Need Px ≥ 2 for full helical action. Px = p / tan ψ = π / Pd tan ψ Wr Wn Wx ψ ψ Wt Tooth line at pitch diameter Wt = 33000(P) vt Wt = Tangential g Load P = Power transmitted (hp) vt = Pitch
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Flywheel energy storage works by accelerating a rotor (flywheel) to a very high speed and maintaining the energy in the system as rotational energy. The energy is converted back by slowing down the flywheel.Flywheel energy storage system is one form of energy storage devices. It is basically a rechargeable battery. It is used to absorb electric energy from a source‚ store it as kinetic energy of rotation‚ and then deliver it to a load at the appropriate time‚ in the form that meets the load needs
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4. How is the tunnel filled in to produce a new osteon? Production of concentric lamellae fills in the tunnel to form new osteon 5. What is the name for the concentric rings that form the osteon? lamellae * * * Exercise 5.3: Skeleton‚ Anterior View * A. skull . B. Hyoid bone . C. Cervical vertebrae
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CENTRIFUGAL PUMPS Introduction A centrifugal pump is a rotodynamic pump that uses a rotating impeller to create flow by the addition of energy to a fluid. Centrifugal pumps are commonly used to move liquids through piping. The fluid enters the pump impeller along or near to the rotating axis and is accelerated by the impeller‚ flowing radially outward into a diffuser or volute chamber (casing)‚ from where it exits into the downstream piping. Centrifugal pumps are used for
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endothermic D) consumed / released / exothermic E) released / consumed / exothermic 2) Which of the structures below is bicyclo[3.2.1]octane? 1) 2) A) B) C) D) 3) 3) In the lowest energy chair conformation of cis-1‚3-dimethylcyclohexane‚ how many axial positions are occupied by hydrogen atoms? A) 6 B) 5 C) 4 D) 2 E) 3 1 4) In the reaction of Cl2 with ethane and UV light‚ which of the following reactions would be a chain termination event(s)? I) Cl· + CH3 -CH3 → CH3 -CH2 -Cl + H· II) Cl· + CH3
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