Engineering

Подробнее на сайте: http://lavandamd.ruhttp://samodelkami.ruGo to top of pagehttp://grand-builder.ruhttp://pro-nedvijimosti.ru http://grand-construction.ruhttp://mending-house.ruhttp://samodelnii.ruGo to top of pagehttp://build-dwelling.ruhttp://samodelkinov.ruhttp://investment-money.ru http://stroi-rukami.ruhttp://sdelaisebe.ruhttp://poleznii.ruhttp://hold-house.ru
http://samodelnaya.ru

connecting rod model of pistonAbstract:

ANSYS capability of assessing fatigue life for a predesigned connecting rod using two materials “Forged Steel” & “Aluminum Alloy” was examined. The results and discussions are presented below.

 

fatigue analysis strategy of connecting rod

Fig. 1 Fatigue Analysis Prediction Strategy

 

Problem Statement:

Fatigue life prediction of a predesigned connecting rod using two materials “forged steel” and “Aluminum Alloy” was carried out using Finite Element Analysis.

The objective is to compare the fatigue behavior of forged steel and Aluminum Alloy respectively. 

Boundary Conditions:

The connecting rod is subjected to a compressive load of 32.11 MPa at crank end and fixed at pin end.

Boundary conditions

 

Results and Disscussion:

FEA was performed on the Forged Steel and Aluminum Alloy Connecting rod to identify critical locations and to determine the stress concentration factors for purposes of life prediction. Geometry of the connecting rod was modeled using CATIA further imported and solved in ANSYS Workbench. From the fatigue analysis of connecting rod, it was determined that the critical locations(Damage prone locations) were at location 1 & 2 as indicated in Figure 3. 

damage prone area

 

Fig. 3 FE Model showing stresses at critical locations

 

Comparison between Forged steel & Aluminum alloy:

result comparision

Fatigue Sensitivity:

Forged Steel:

fatigue sensitivity

 

Aluminum Alloy:

fatigue sensitivity

 

Conclusion:

  • Minimum life prediction of Aluminum alloy’s connecting rod is 3 times more than the minimum life of forged steel’s connecting rod.The maximum life of Aluminum alloy’s connecting rod is 100 times more than the maximum life of forged steel’s connecting rod.
  • The damage possibility in Aluminum alloy’s connecting rod is 3 times less in comparison of forged steel connecting rod.
  • The safety factor is also high in case of Aluminum alloy’s connecting rod i.e. approx. 2 times of forged steel connecting rod.
  • Constant amplitude specimen fatigue testing shows that the fatigue strength at 106 cycles was 179.85 MPa for forged steel and 176.73 MPa for Aluminum alloy.  The Aluminum alloy connecting rod had about 100times longer life than the Forged steel connecting rod in the long life region.
  • Fatigue sensitivity shows the number of life cycles against the repetitive compressive load in graphical representation.

Final Deduction:

Fatigue life prediction of a predesigned connecting rod using two materials “forged steel” and “Aluminum Alloy” was carried out and it is observed that the minimum life prediction of Aluminum alloy’s connecting rod is 3 times more than the minimum life of forged steel’s connecting rod.