Browse Publications Technical Papers 2004-01-1500
2004-03-08

Optical Measurement of Residual Stress at the Deep-Rolled Crankshaft Fillet 2004-01-1500

Crankshaft fillet is subjected to a cyclic bending stress during operation. Fatigue cracks are observed at the fillet during the fatigue test. Compressive stresses are generated by deep-rolling process in order to increase the surface hardness and improve the fatigue strength. To examine the deep-rolling effect, the residual stresses at the fillet need to be investigated.
Incremental hole drilling and ISSR (interferometric strain/slope rosette) method is applied to measure the residual stresses at the bottom of the fillet. Incremental hole drilling process is to gradually remove material and mill a hole on the specimen surface in order to relax stress. The ISSR is composed of three micro-indentations, which are indented near the hole and would generate interferometric fringe patterns upon incident laser beam. With incremental drilling, stress relaxation causes the relieved strains, which in turn cause the shifts of interferometric patterns. The relieved strains can be calculated from the recorded shifts of fringe patterns. To determine residual stresses, the strain-stress response coefficients need to be calculated using the finite element method.
Because the fillet is an annular groove with small semicircle cross-section, the miniature ISSR shows its advantages over the common resistance strain rosette. It is challenging to precisely model the fillet and simulate the drilling process.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Rating Sleeve Bearing Material Fatigue Life in Terms of Peak Oil Film Pressure

871685

View Details

TECHNICAL PAPER

A Study for Wear and Fatigue of Engine Bearings on Rig Test by Using Elastohydrodynamic Lubrication Analysis

1999-01-0287

View Details

TECHNICAL PAPER

A Thermoviscoplastic FE Model for the Strain Prediction in High Temperature, Thermal Cycling Applications for Silicon Molybdenum Nodular Cast Iron

980697

View Details

X