Vibration behavior of a precipitation-hardening aluminum alloy under resonance

Song, Jenn‐Ming; Lui, Truan-Sheng; Horng, Jeng Haur; Chen, Lihui; Chen, T. F.

doi:10.1016/j.scriptamat.2004.08.013

Cited by 5 publications

(6 citation statements)

References 16 publications

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“…Since the gliding mode of mobile dislocations under peak-aged conditions was supposed to be precipitate bypassing (so-called Orowan looping), no persistent slip band was found. 6) With respect to the 60X, the main crack tended to grow through the Al 3 (Ni,Cu) particles and led to a more tortuous cracking than 6061. Figure 8(a) illustrates that large side cracks could be found parallel to the main crack.…”

Section: Vibration Properties and Vibration Fracture Resistancementioning

confidence: 99%

“…6) That is, a sample with a lower initial deflection exhibits a superior ability to dissipate vibration energy. Based on the data shown in Fig.…”

Section: Vibration Properties and Vibration Fracture Resistancementioning

confidence: 99%

“…2) In the past decade, several research works have been devoted to the vibration behavior of Al-Mg-Si alloys. [3][4][5][6] With respect to the effect of aging conditions, it was found that aging conditions significantly affect the resonant vibration properties, such as vibration deformation feature and damping capacity. The peak aged samples possess a poor damping capacity mainly due to the decrease in dislocation mobility.…”

Section: Introductionmentioning

confidence: 99%

“…The peak aged samples possess a poor damping capacity mainly due to the decrease in dislocation mobility. 6) Among the elements added to 6xxx series alloys for increasing strength and grain-size control, copper has arrested considerable attention. Cu additions reduce the natural aging rate of Al-Mg-Si alloys but generally increase the kinetics of precipitation during artificial aging.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Characteristics and Vibration Fracture Properties of Al-Mg-Si Alloys with Excess Cu and Ni

2007

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This study investigated the effect of co-addition of Cu and Ni on the microstructure and vibration properties of Al-Mg-Si alloys. The results show that additions of Cu and Ni resulted in the formation of Al 3 (Ni,Cu) phase, a harder Al matrix and an accelerated aging rate. Nanoindentation analysis indicates that the Al 3 (Ni,Cu) phase exhibits a hardness of 7.7 GPa and Young's modulus of 141.2 GPa. Due to the increased modulus by reinforcement effect of Al 3 (Ni,Cu), the alloyed samples possessed a higher resonant frequency. However, the damping capacity was reduced with alloying because of the hardened matrix. It was also found that since microcracks could be generated from the irregular-shaped Al 3 (Ni,Cu) in the vicinity of the tip of the main crack when suffering vibration deformation, the crack propagation resistance of the alloyed samples was inferior.

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Section: Vibration Properties and Vibration Fracture Resistancementioning

confidence: 99%

“…6) That is, a sample with a lower initial deflection exhibits a superior ability to dissipate vibration energy. Based on the data shown in Fig.…”

Section: Vibration Properties and Vibration Fracture Resistancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructural Characteristics and Vibration Fracture Properties of Al-Mg-Si Alloys with Excess Cu and Ni

2007

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“…Aging conditions significantly affects the resonant vibration, such as vibration deformation feature and damping capacity, in the case of precipitation hardened Al-Mg-Si alloy. Under the vibration conditions in study by J.M.Song et al [6], the damping capacity decreases with a longer artificial aging time, but this tendency reverses when over-aging conditions are reached.…”

Section: Composite (Mmc) and Rapid Solidification Andmentioning

confidence: 84%

Fatigue Life Estimation of 6061 Aluminium Alloy Based on Modal Damping Measurements

Asseala¹,

Gomaa²

2005

ERJ. Engineering Research Journal

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The damping property of 6061 aluminium alloys, fabricated by hot isostatic pressing (HIP), has been studied for different ratios of fatigue on the base of modal damping analysis. The effects of age hardening on hardness, fatigue strength and damping loss factor of the material are discussed. On the other hand, the interrelations of fatigue life ratios and the damping loss factor are examined using modal analysis of free-free standard fatigue specimens within a wide range of resonance frequencies (2000 Hz-25 kHz). Methodologies used to generate data and extract the characteristics of damping phenomenon have been illustrated. Numerical analysis of values of damping loss factor has been evaluated and compared with experimental measurements. A rotating bending fatigue test is performed to correlate the modal damping to fatigue damage. The results show that, age hardening process increases the fatigue strength by 15% and the damping loss factor by 160 %. The underlying mechanisms are analyzed and discussed. The results seem to be a useful guide that may help in estimating the lifetime or at least the remaining life of a member loaded under fatigue through measuring damping loss factor. &LJj,yl &I + + 4;ii-ilJ 7. 7 \ ?+&I &&dl A &. ? ! +k L i j~ + I \.4h JJ&-1 JJUJ.(modal damping analysis)+&dl &+?I1

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