Ln10 - ME4123/6123: Failure Analysis of Truck Steering...

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1 ME4123/6123: Failure Analysis of Truck Steering Shaft
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2 Material Failure stress = 1000 – 1300 MPa Failure Strain = 8% F Worm gear Turn gear Steering wheel axle linkage ME4123/6123: Failure Analysis of Truck Steering Shaft
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3 ME4123/6123: Failure Analysis of Truck Steering Shaft
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4 Problem Statement Two Possibilities 1. Failure occurred before the accident and the loss of steering caused the accident 2. The accident was caused by something else and the shaft broke from the impact of the accident To admit (1) we must prove the shaft failed prematurely under normal loads To admit (2) we must prove that the shaft failed under an overload
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5 Fracture Description
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6 Fracture Description • Twisting of splines • Cup cone • Center rough area (tensile overload) • Smooth area (shear overload)
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7 Material Characterization 50 mm Case harden layer (1.5mm)
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8 How about Failure Torque?
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9 Ultimate shear stress against radial distance The total torque is therefore (2.06 + 0.98)= 3.04 E+07 N mm. It
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Ln10 - ME4123/6123: Failure Analysis of Truck Steering...

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