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Mechanical Engineering


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  1. Considering the section modulus makes me conclude that the hollow one would be stronger in both the cases - same dia and same weight ! That's quite fascinating.
  2. I have some serious confusion regarding the title for the following issue . I have read on plethora of forums and sites, giving the explanation of why hollow tubing is stronger than solid rod of the same dia or weight by justifying as to why it bends the least . This makes me ponder ! Stronger or stiffer ? Isn’t that least bending property under a given load ( of hollow tubing ) attributed to stiffness ? I would also like to clear if these conclusions of mine are right ? 1. Of the same dia – Hollow tubing is stiffer but Solid rod is stronger (owing to the more material present in it ) 2. Of the same weight – Hollow tubing is stiffer but both have the same strength (owing to the same amount of material in it - assuming the yield strength is independent of the geometry ) Would be very helpful if someone could kindly throw some light on the same ! Thanks
  3. Hello guys ! I'm just a beginner to strength of materials and all . I have been wondering about the usage of C channel since a long time and couldn't find an answer to my query . I have always observed the usage of C channel as it is named ( the cross section is always C ) . Be the in the ladder frame , any chassis where is it used , or engine stand, if its used . What I wonder is that why cant it be used as an inverted U ? ( tilting it 90 degrees to the right ) . An inverted U would probably provide the best stability and resistance towards bending when loaded ( my knowledge says this ) . Apart from the ease of assembling and manufacturing using C as the cross section , what other major advantage does the traditional way offer ? Can anyone clarify this ? Thanks !
  4. Hello everyone !I have a conceptual confusion in designing my combat fighter bot ( a wedge robot ) .Its a 40 Kgs bot powered by 24V batteries .. It would somewhat like in the pic below .okay ! so now heading to my query …im planning to make it a 4 wheel drive with the following 4 geared motors . It provides 300 rpm and 11 Nm torque . I had thought of using the same for the rear wheels directly without any further reduction . But for the front wheels , i thought for making a 18 tooth sprocket on the shaft , ( 9 on the motor ) , thereby doubling the torque ( since i need more pushing force to pin the opponent ) .but then , the rear and front pairs have differing rpm ( 300 and 150 respt. ) . While driving the bot , i would be driving with the rear wheels alone . I would include the front wheels only while pushing an opponent .so , while driving the bot with the rear wheels alone , since the front ones r stationary , will they drag/slide and give more resistance and back fire ? or will it be fine to design such a bot ?thank u
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