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Mechanical Engineering

Panagiotis Bu

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Panagiotis Bu last won the day on April 1 2020

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  1. Thanks for the response , i'm going to answer all the above : 1) Supports are fixed , the bars can only rotate . 2)I dont have numerical values of the data , i try to solve it using variables and create a general formula 3)Yes , the connecting joint has an initial displacement . I dont have any other data about magnitude or direction , i only know that i have displaced the connecting joint and later i let it move freely ( from zero velocity) and an oscillation takes place ( on x , y axis) due to elasticity . 4)If "U" is the horizontal velocity and "V" the vertical velocity of the connecting joint then i want to find how these 2 velocities change during the oscillation/time . I want to find the formulas for U(t),V(t) (t=time) . But yes oscillation frequency is needed for these equations . 5)I consider only axial deformation , and the maximun degrees of freedom for each node should be 2 ( moving vertically , moving horizontally)
  2. Hello engineer's community !! I got a problem. If i got a truss frame with 2 bars and an initial nodal displacement for the common node , then how can i calculate the velocity of the oscilation as function of time ? (the 2 bars have different length , same elasticity modulus , same density and different angle with the horizontal line and they are connected to a common node as i said ) I would be glad if you help me !
  3. On a 20x5 rectangular right screw thread the screw made of Nylon 66 is exactly the same as the female thread made of Ck60 steel. The radial gaps of the two threads are all 0.1mm and the total thread height 2.7mm. As is common in all plastic threads, the screw has a slightly greater thread thickness, ie 2.51 mm instead of 2.5 mm with the hole. Considering the elasticity measures of the laminar material E1 = 3.2GPa and the steel E2 = 205GPa, calculate the torque required to screw and unscrew 7 coils from the thread. As a friction factor, consider 0.08 in all positions.
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