Optimization of Diesel Engine’s Liner Geometry to Reduce Head Gasket’s Fretting Damage

Primary fretting fatigue variables such as contact pressure, slip amplitude and bulk cyclic stresses, at and near the contact interface between the rivet shank and panel hole in a single rivet-row, 7075-T6 aluminum alloy lap joint are presented. Three-dimensional finite element analysis is applied to evaluate these and the effects of interference and clamping stresses on the values of the primary variables and other overall measures of fretting damage. Two rivet geometries, non-countersunk and countersunk, are considered. Comparison with previous evaluations of the fretting conditions in similar but two-dimensional connections indicates that out-of-plane movements and attending effects can have a significant impact on the fatigue life of riveted connections. Variations of the cyclic stress range and other proponents of crack initiation are found to peak at distinct locations along the hole-shank interface, making it possible to predict crack initiation locations and design for extended life.

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Microstructural characterization of fretting damage

Wear ◽

10.1016/0043-1648(93)90553-x ◽

1993 ◽

Vol 162-164 ◽

pp. 624-626 ◽

Cited By ~ 2

Author(s):

R.-M. Lundh ◽

Z. Lai ◽

H. Norden

Keyword(s):

Microstructural Characterization ◽

Fretting Damage

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Radial fretting damage behavior of human femur cortical bone and fem analysis

Journal of Biotechnology ◽

10.1016/j.jbiotec.2008.07.948 ◽

2008 ◽

Vol 136 ◽

pp. S410

Author(s):

Zhenbing Cai ◽

Minhao Zhu ◽

Haiyang Yu ◽

Huoming Shen ◽

Qian Huang ◽

...

Keyword(s):

Cortical Bone ◽

Fem Analysis ◽

Damage Behavior ◽

Human Femur ◽

Fretting Damage

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Riveted single lap joints Part 2: Fatigue life prediction

Proceedings of the Institution of Mechanical Engineers Part G Journal of Aerospace Engineering ◽

10.1243/0954410971532550 ◽

1997 ◽

Vol 211 (2) ◽

pp. 123-128 ◽

Cited By ~ 5

Author(s):

C-P Fung ◽

J Smart

Keyword(s):

Finite Element ◽

Fatigue Life ◽

Effective Stress ◽

Fatigue Testing ◽

Strain Range ◽

Lap Joints ◽

Total Strain Range ◽

Single Lap Joints ◽

Data Points ◽

Fretting Damage

Fatigue lives of snap and countersunk riveted single lap joints with either one-row or two- rows of rivets have been predicted with fatigue laws using either local total strain range or effective stress obtained from finite element analyses and data obtained from fatigue testing of plates with holes. The finite element models of the joints were subjected to an alternating cyclic load; plasticity and nonlinear geometry are considered. The failures have also been metallurgically examined and gave evidence of fretting damage. It was found that all the data points lie within a narrow band using the strain-life law although the band is wider when using the effective stress-life law, but it is impossible to predict the fatigue life from one kind of specimen to another using the conventional stress-life law.

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