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Mechanical Engineering

MayankBambal

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Everything posted by MayankBambal

  1. Sir DrD, it seems you are a professor!(always makes students to read,read and read more) that comment made me read my notes again(and some internet articles) to really understand the concept of tensors. i must say i did a foolish mistake. Yes stress is a second order tensor while pressure is zero order tensor. Thank you very much for correcting me.
  2. Most of above answers are good and almost explains the difference. only one point to add: 1. pressure is a scalar while stress is a vector. Don't know much, but i will try to answer. First of all some definitions: 1. MoE: It is the ratio of stress to the strain developed. strain is dimensionless and hence the units of MoE are same as that of Stress i.e. N/m2 or Psi. 2.Strength: or i can say maximum strength or Ultimate strength. is the maximum force that a material( in our case steel) can withstand just before fracture. 3.Yield strength: it is the value of stress at which sample starts yielding. i.e. going plastic deformation. as seen from the above definitions all three are not same. e.g. for pure aluminum. the MoE is 10^7 psi, Ultimate strength : 110*10^6 psi and Yield strength: 95*10^6 psi for different steel there is same MoE but different strength as shown in the image.
  3. state difference between under actuated and fully actuated motion. explain with the example?
  4. I am a student and many on this forum are students like me. the idea of opening a job portal is very nice. and can you also make a portal for internship and training programs offered by industries and institutes. our institute have various research projects that are open to every one. see if you can add such section.
  5. hey, I tried looking up for the above link but it say "Item not found". and I was not able to copy the links from second post. it would be very helpful if you can post them again as hyperlink.
  6. Just to add few things: With UTM we calculate the Yield strength(upper and lower), Proportionality limit, Ultimate tensile/compression strength, modulus of elasticity etc. The name universal signifies its versatility.
  7. when deriving the above formula we considered a case in which both the joints are pinned at ends. rather than deriving the formula for all other cases. we took some most used cases and generalized the formula using effective length. there is no formal definition for effective length but can be defined as. The length of an imaginary section of the column which is equivalent to a pinned-pinned column with same cross-section and material property. this is better explained in the picture itself.
  8. Steam quality is the proportion of saturated steam (vapor) in a saturated condensate (liquid)/ steam (vapor) mixture. A steam quality of 0 indicates 100 % liquid, (condensate) while a steam quality of 100 indicates 100 % steam.
  9. Version 1.0.0

    1,430 downloads

    ME208( theory of manufacturing processes) Presentation of my professor as taught in spring 2017 Joining methods: this includes welding brazing riveting and various other methods.
  10. Version 1.0.0

    1,524 downloads

    ME208( theory of manufacturing processes) Presentation of my professor as taught in spring 2017 Subtopics: 1. Forging and its types 2.TTT diagram for steel 3.Hot working Cold working 4.Sheet metal working
  11. I have uploaded few powerpoint presentations on Manufacturing processes. if you get time do review them so, I can rectify the mistakes and add some more info if left. thanks in advance.

    1. saurabhjain

      saurabhjain

      thank you very much

  12. Version 1.0.0

    1,190 downloads

    ME208( theory of manufacturing processes) Presentation of my professor as taught in spring 2017 subtopics: casting types of casting details of sand casting different parts used and their functions
  13. Version 1.0.0

    1,439 downloads

    ME208( theory of manufacturing processes) Presentation of my professor as taught in spring 2017 Subtopics: 1.Lathe 2.Milling 3.Drilling
  14. Detonation: after completion of compression stroke in SI IC engine. The spark plugs ignites the injected fuel and explosion is started. Knocking: some fuel may get ignited during compression stroke itself before ignition from spark plug. This produce knocking sound and hence called knocking.
  15. Grain is the cutting element in a grinding wheel. They are generally bounded to each other and some gap is also being kept in between to dissipate heat. Here we may have different types of grains or different sizes among same type for different uses. Grade: it represents the hardness of grinding wheel I.e. how strongly the grains are bounded to each other. In general we use soft grade for hard material and vice versa.
  16. Want to explain this answer Few factor on which the sound of bike depends 1.exhaust system 2.idle rpm 3.exhaust pipe diameter 4.crank weight 5.turbocharger 6.piston length and diameter of piston 7.aging 8.firing order nature of engine sporty or crusie compression ratio muffler 9.method of injection direct or carburator i would say the major factor among these is the cubic capacity and design of exhaust pipe.
  17. Superchargers and turbochargers are mentioned almost in the same breath by many people in the auto industry. There is definitely a difference between the two of them. Either one will deal with power. Turbochargers and superchargers are known as forced induction systems. It means that either will compress the air flowing into the engine, which provides more power to the car. This creates a considerable amount of boost, which can be as much as 50% more power into the engine. This makes a luxury car or high-end sports car roar like a lion whenever the owner is tired of the engine purring like a kitten. A main difference between the turbocharger and the supercharger lies in the power supply. A turbocharger uses the exhaust stream for its energy. The exhaust will run through a turbine that will itself spin the compressor. The turbine spinning can be as much 150,000 RPM (Rotations Per Minute). To put that in layman’s terms, the turbocharger is able to have an RPM speed that can be almost 30 times faster than an ordinary automobile engine. It does take a little while for the turbine to produce the boost, and can result in the car lunging forward when the turbocharger kicks into action. The size of the turbocharger can impact power with a smaller one producing more boost faster. A turbocharger is particularly effective at high altitudes where other engines experience difficulty. Because the air is less dense a normal engine gets a smaller amount of air. Turbocharged engines do not suffer a dramatic reduction in power since the turbocharger is more capable of pumping thinner air. The source of the power for the supercharger is in a belt connected directly to the engine. A supercharger will compress air of the atmospheric pressure, and create the boost by forcing air into the engine. The supercharger can add as much as 46% more horsepower because the increased air will allow more fuel to be added to the combustion charge. Like the turbocharger, a supercharger will do well in high-altitude.
  18. Ideally speaking Axles are meant for balancing/transferring Bending moment and Shafts are meant for Balancing/transferring Torque.But,they can be used interchangeably also.We can have a shaft which also transmits Torque as well as Balances bending moment and in the same way an axle can also function as shaft.Such machine elements which function as axle as well as shaft are called Axleshafts.Axleshafts are designed while taking care of the acting Bending Moment as well as Torque. Ideally speaking Axles are meant for balancing/transferring Bending moment and Shafts are meant for Balancing/transferring Torque.But,they can be used interchangeably also.We can have a shaft which also transmits Torque as well as Balances bending moment and in the same way an axle can also function as shaft.Such machine elements which function as axle as well as shaft are called Axleshafts.Axleshafts are designed while taking care of the acting Bending Moment as well as Torque.
  19. It turns out that if you optimize the performance of a car and of an airplane, they are very far away in terms of mechanical features. So you can make a flying car. But they are not very good planes, and they are not very good cars. Gregory Benford

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