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FEA analysis of Screw Jack using NX- Advanced Simulation
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Screw Jack CAE BenchmarkCAE analysis for Screw Jack
Content Case 1: Jack resting on horizontal plane jack opened at 325.5 mm. Case 2: Jack resting on inclined plane with angle of inclination + 5 degrees Case 3: Jack resting on inclined plane with angle of inclination + 8 degrees
Overview of the model used
Assumptions FEM technique is used with NX Nastran solver for solving static solution. Material is assumed to be homogeneous and isotropic and UTS data is used
as provided by customer i.e. 28 Kg/mm^2 (275 N/mm^2) Screw Jack model is used as provided by client. Results may vary depending
on the accuracy of the model. 3D Tetrahedral mesh is used for connections 1D elements are defined.
Case 1: Jack resting on horizontal plane jack opened at 325.5 mm Jack is resting on horizontal plane with height of 325.5 mm and dead load of
450 Kg is applied at the top. Displacement and the stresses are recorded.
Boundary ConditionsLoad= 450 Kg
Fixed support(Base)
Case 1: Displacement Results
Maximum Displacement = 0.427 mm
Case 1: Elementral stress (Von-Mises)
Maximum Stress= 192.92 N/mm2FOS = 1.42
Case 1: Elementral stress (Von-Mises)Maximum Stress= 192 N/mm2
Case 2: Jack resting on inclined plane with angle of inclination + 5 degrees. The problem is resolved by applying a load inclined at an angle of 75 degrees
positive ( i.e. 90-5= 85 degrees) Displacement and the stresses induced are recorded.
Boundary Conditions Load 450 KgInclined at +85⁰
Fixed support
Case 2: Displacement ResultsMaximum Displacement = 0.696mm
Case 2: Elemental Stress (Von-Mises)
Maximum Stress = 339.20 N/mm2 FOS= 0.81
Case 2: Elemental Stress Failure Area
Case 3: Jack resting on inclined plane with angle of inclination +8 degrees
Boundary ConditionsInclined load 450 Kg at 82⁰
Fixed support
The problem is solved by applying a load inclined at an angle of 75 degrees positive ( i.e. 90-8= 82 degrees)
Displacement and the stresses induced are recorded.
Case 3: Displacement Results
Maximum Displacement = 1.101 mm
Case 3: Elemental Stress (Von-Mises)
Maximum stress = 492.45 N/mm2 FOS= 0.55
Case 3: Elemental Stress Failure Area
Results & Discussions The CASE 1 is safe and there is no failure occurring in it. It is advised to modify and optimise the base part for stress as the part is
showing failure due to crushing in case of inclined load application (case2 & case 3 )