Week 8 - Universal Joint

objective: To perform a trancient structural analysis on a double universal joint with a spring using 3 different material

case1- structural steel

case2- stainless steel

case3- titanium alloy

the three material must be used on the joint with the springs alone

procedure: create transient structural analysis and in engineering data select the material structural steel

structural steel:

import the geometry and check in space claim for any irregularities.

then open ansys mechanical and assign the structural steel material to all components.

joints

fixed - body to ground joint - the spring at the end it provided a fixed joint 

Revolute - body to ground joint

Revolute - body to ground joint

Revolute - body to body joint is given to all the pins and gears

mesh- mesh the whole geometry with 4mm element size and set adaptive sizing to no

Analysis setting - The simulation run for 5 steps. so, the number of steps is set as 5

large deflection set to on, auto time stepping to off, define by time and time step set to 0.13. In output control set all output to yes

joint - rotation - The revolute joint of the gears is provided a rotation of 150 degrees

Result - The analysis runs successfully and results obtained 

case1- structural steel is assigned for all the parts of assembly.

total deformation max - 38.637mm

equivalent stress max - 1478.9Mpa

equivalent stress at joint max - 5.9309Mpa

case2- stainless steel is assigned on the joint with the spring alone

total deformation max - 38.637mm

equivalent stress max - 1430.3Mpa

equivalent stress at joint max - 5.9248Mpa

case3- titanium alloy is assigned on the joint with spring alone

 

total deformation max - 38.637mm

equivalent stress max - 723.16Mpa

equivalent stress at joint max - 5.8387Mpa

conclusion:

• structural steel experience max stress due to highest young's modulus. stress is directly proportional to young's modulus. so, the max value is in structural steel and minimum value is in titanium alloy.
• total deformation is same in all the cases due to the equal amount of rotaion given.