EFFECT OF BEARING PRESSURE ON FATIGUE STRENGTH OF RIVETED CONNECTIONS
THE EFFECT OF BEARING PRESSURE ON THE FATIGUE STRENGTH OF RIVETED JOINTS HAS BEEN STUDIED THROUGH TESTS OF DOUBLE LAP JOINTS HAVING FOUR 7/8-INCH DIAMETER RIVETS ARRANGED IN A SQUARE PATTERN. THE 120 SPECIMENS WERE TESTED UNDER ZERO-TO- TENSION, FULL-REVERSAL, AND HALF TENSION-TO-FULL TENSION LOADINGS. THE BEARING RATIOS STUDIED WERE 1.37, 1.83, 2.36, AND 2.74. A PORTION OF THE SPECIMENS WERE TESTED WITH REDUCED CLAMPING IN THE RIVETS, WHILE ALL OTHERS WERE TESTED IN THE AS FABRICATED CONDITION. ON THE BASIS OF THE RESULTS OF THESE TESTS, IT APPEARS THAT A DECREASE IN FATIGUE LIFE WILL GENERALLY ACCOMPANY AN INCREASE IN BEARING RATIO, ES- PECIALLY WHEN THE BEARING IS MORE THAN 2.25 TIMES THE TENSILE STRESS. HOWEVER, THE BEARING RATIO CANNOT BE CHANGED WITHOUT ALTERING OTHER VARIABLES SUCH AS THE GEOMETRY OF THE CRITICAL PLATE AND THE GRIP OF THE RIVETS /ALONG WITH THE RESULTING CHANGES IN THE RIVET CLAMPING FORCE/. IT APPEARS THAT THE RESULTS FROM THIS STUDY SHOULD BE CONSIDERED IN THE SELECTION OF STRESSES FOR THE DESIGN OF RIVETED JOINTS SUBJECT TO REPEATED LOADINGS OF REVERSAL OR ZERO-TO-TENSION AND HAVING AN EXPECTED LIFE OF MORE THAN 100,000 CYCLES. SINCE CURRENT /1964/ STRUCTURAL PRACTICE APPEARS APPROPRIATE FOR EXPECTED LIVES OF LESS THAN 100,000 CYCLES. /AUTHOR/
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Supplemental Notes:
- No 481, 57 PP
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Authors:
- Parola, J F
- Chesson, E
- Munse, W H
- Publication Date: 1965
Media Info
Subject/Index Terms
- TRT Terms: Bearing capacity; Fatigue (Mechanics); Joints; Lap joints; Loads; Pressure; Rivets; Tension
- Uncontrolled Terms: Fatigue life; Loading; Tensile stress
- Old TRIS Terms: Cycles; Riveted joints
- Subject Areas: Geotechnology; Highways; Materials;
Filing Info
- Accession Number: 00216090
- Record Type: Publication
- Files: TRIS
- Created Date: May 4 1994 12:00AM