Week 8 - Universal Joint

UNIVERSAL JOINT

AIM:

TO SIMULATE AND ANALYSE FOR THE UNIVERSAL JOINT PROVIDED WITH THREE DIFFERENT MATERIALS .

MODEL:

THE MODEL CONSISTS OF TWO UNIVERSAL PINS CONNECTED TO A SPRING JOINT AND A JOINT .

MATERIALS:

THE SIMULATION IS DONE UNDER THE GIVEN THREE MATERIALS.

• STRUCTURAL STEEL
• STAINLESS STEEL
• TITANIUM ALLOY

STRUCTURAL STEEL :

STAINLESS STEEL :

TITANIUM ALLOY :

CONNECTIONS :

SINCE WE ARE NOT FOCUSING ON THE CONTACT FORCES , WE ARE NEGLECTING THE CONTACTS IN THE MODEL .

JOINTS:

THE JOINTS ARE PROVIDED TO PERFORM THE SIMULATION . THE JOINTS PROVIDE THE NECESSARY FORCES AND SUPPORT TO THE SIMULATION . THIS SIMULATION IS CARRIED UNDER THREE DIFFERENT JOINTS .

FIXED JOINT :

THE FIXED JOINT IS PROVIDED TO THE END OF THE SPRING JOINT . IN-ORDER TO MAKE THE SPRING FIXED WITH OUT GETTING SLIPPED BY THE RESULTANT FORCES .

REVOLUTE JOINT : ( BODY – GROUND)

THIS REVOLUTE JOINT IS THE PRIMARY JOINT WHICH ACCELERATES THE SIMULATION . IT PROVIDES THE REQUIRED FORCES TO INITIATE THE SIMULATION . THE BODY TO GROUND REVOLUTE JOINT IS IMPOSED ON THE SPRING JOINT AND THE OTHER END JOINT .

REVOLUTE JOINT ( BODY TO BODY ) :

THIS REVOLUTE JOINT ALLOWS THE BODY TO ACT ACCORDING TO THE RESULTANT MOTION OBTAINED FROM THE PRIMARY LOAD. THIS REVOLUTE JOINT TRANSFERS MOTION FROM ONE BODY TO ANOTHER AND IN THE DIRECTION OF THE REFERENCE. THIS JOINT IS PROVIDED TO THE UNIVERSAL PINS CONNECTING THE MID-JOINTS, THIS MID-JOINT IS THEN CONNECTED TO THE OTHER JOINTS, SO THAT THE MOTION FROM THE PRIMARY LOAD JOINTS IS TRANSFERRED TO THE OTHER JOINT BY MEANS OF THE MID-JOINT.

JOINT 1 :

JOINT 2 :

MESH:

THE MESH HAS BEEN CREATED BY MEANS OF GRID DEPENDENCY TEST AND FOR FURTHER REFINEMENT WE ARE USING BODY SIZING MESH OF 2 mm ON THE MID-JOINT.

ANALYSIS SETTINGS:

THE ANALYSIS IS CARRIED OUT BY 5 STEPS, THE TYPE OF SOLVER IS PROGRAM CONTROLLED AND THE WEAK SPRINGS IS KEPT PROGRAM CONTROLLED AND AUTO-TIMING STEP IS KEPT OFF WHERE THE INITIAL TIME STEP IS KEPT TO 0.1 s.

JOINT LOAD:

THE LOAD IS PROVIDED ON THE JOINT NO.1, WHERE IT ACTUALLY PRODUCES THE NECCESSARY ROTATIONAL FORCE.

CASE 1: STRUCTURAL STEEL

TOTAL DEFORMATION:

EQUIVALENT STRESS ( VON-MISES) :

THUS FROM THE ABOVE SIMULATION , WE CAN FIND THAT THE STRESS DEVELOPED ON STRUCTURAL STEEL IS 1899 MPa.

FORCE CONVERGENCE:

CASE 2: STAINLESS STEEL

TOTAL DEFORMATION:

EQUIVALENT STRESS ( VON-MISES) :

THUS , FROM THE ABOVE SIMULATION WE CAN FIND THAT THE STRESS DEVELOPED IN THE MATERIAL 2 IS 1831.6 MPa.

FORCE CONVERGENCE:

CASE 3: TITANIUM ALLOY

TOTAL DEFORMATION:

EQUIVALENT STRESS ( VON-MISES):

THUS , FROM THE ABOVE SIMULATION WE CAN FIND THAT THE STRESS DEVELOPED IN THE TITANIUM ALLOY IS 1071.4 MPa.

FORCE CONVERGENCE:

RESULT:

THUS, FROM THE ABOVE SIMULATION AND ANALYSIS WE CAN COME TO A CONCLUSION THAT THE MATERIAL TITANIUM ALLOY PRODUCES LESS STRESS THAN THE OTHER TWO MATERIALS.THIS IS DUE TO THE NATURE OF ALLOY WHICH CONTAINS HIGH AMOUNT OF CARBON AND IRON AND OTHER METALS AND NON - METALS , WHICH MAKES THE MATERIAL SUSTAIN HEAVIER LOADS THAN THE STEEL , WHERE IT CONTAINS LESSER AMOUNT OF CARBON.