Comparison of Single Gear Tooth and Cantilever Beam Bending Fatigue Testing of Carburized Steel

Metal free reeds are used for musical instruments like harmonica. Free reeds are small, thin cantilevers, and oscillate by blowing air. It is reported that free reeds break due to fatigue during play. In order to elongate the life of free reeds, the fatigue properties should be investigated and a motion analysis method should be developed. The experimental and analytical research on metal free reed, however, has been rarely reported. In this study, two types of fatigue testing machines were developed to obtain basic fatigue characteristics. The fatigue testing machines are designed for bending fatigue of actual free reeds whose thickness is less than 400 μm. An S-N diagram is successfully obtained up to 107 cycles by using the developed fatigue testing machines. The fracture surfaces of fatigued specimens are in good agreement with those of free reeds failed in use. Then, an analytical method for the self-excited oscillation of free reeds was developed based on a mass-damper-spring model. The proposed method can take account for the shape of free reed. The self-excited oscillation of free reeds with different shape are analyzed and in good agreement with experimental results.

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Improvement of Fatigue Behaviour of High Strength Aluminium Alloys by Fluidized Bed Peening (FBP)

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.344.87 ◽

2007 ◽

Vol 344 ◽

pp. 87-96 ◽

Cited By ~ 2

Author(s):

M. Barletta ◽

F. Lambiase ◽

Vincenzo Tagliaferri

Keyword(s):

Fatigue Life ◽

Fluidized Bed ◽

Fatigue Testing ◽

Fatigue Behavior ◽

Maximum Amplitude ◽

High Strength ◽

Operational Parameters ◽

Bending Fatigue ◽

Rotating Bending Fatigue ◽

Rotating Bending

This paper deals with a definition of a relatively novel technique to improve the fatigue behavior of high strength aluminum alloys, namely, Fluidized Bed Peening (FBP). Fatigue samples made from AA 6082 T6 alloy were chosen according to ASTM regulation about rotating bending fatigue test and, subsequently, treated by varying FBP operational parameters and fatigue testing conditions. First, a full factorial experimental plan was performed to assess the trend of number of cycles to rupture of fatigue samples varying among several experimental levels the factors peening time and maximum amplitude of alternating stress applied to fatigue samples during rotating bending fatigue tests. Second, design of experiment (DOE) technique was used to analyze the influence of FBP operational parameters on fatigue life of AA 6082 T6 alloy. Finally, ruptures of FB treated samples and untreated samples were discussed in order to evaluate the influence of operational parameters on the effectiveness of FBP process and to understand the leading process mechanisms. At any rate, the fatigue behavior of processed components was found to be significantly improved, thereby proving the suitability of FBP process as alternative mechanical technique to enhance fatigue life of components made from high strength aluminum alloy.

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Test Method for Bending Fatigue Testing for Copper-Alloy Spring Materials

10.1520/b0593-21 ◽

2021 ◽

Author(s):

Keyword(s):

Copper Alloy ◽

Fatigue Testing ◽

Test Method ◽

Bending Fatigue

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