Measurement of crack induced damping of cast magnesium alloy AZ91

Göken, J.; Letzig, Dietmar; Kainer, Karl Ulrich

doi:10.1016/j.jallcom.2003.10.061

Cited by 9 publications

(4 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The strain independent part is overlapped by another mechanism to be taken into account when using higher starting strain amplitudes. This mechanism is plastic deformation and was shown in a previous paper on fatigue-dependent damping [7] . Fig.…”

Section: Resultsmentioning

confidence: 61%

Influence of heat treatment on damping behaviour of the magnesium wrought alloy AZ61

González-Martínez¹,

Göken²,

Letzig³

et al. 2007

Acta Metallurgica Sinica (English Letters)

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 61%

Influence of heat treatment on damping behaviour of the magnesium wrought alloy AZ61

González-Martínez¹,

Göken²,

Letzig³

et al. 2007

Acta Metallurgica Sinica (English Letters)

View full text Add to dashboard Cite

show abstract

“…Anasori et al [34] found that the high damping of Ti 2 AlC itself is the main reason for the high damping performance of Ti 2 ALC-Mg composites upon adding TiC and Ti 2 AlC particles to a magnesium alloy, and. J. Göken et al [35] found that cracks may also be used as damping sources to increase the damping properties of magnesium alloys. The diffusion process at the crack tip is considered the main mechanism of crack-induced damping.…”

Section: Dislocation Damping Mechanism In Magnesium Alloysmentioning

confidence: 99%

Research Progress on the Damping Mechanism of Magnesium Alloys

Wang,

Wan,

Dang

et al. 2023

Materials

View full text Add to dashboard Cite

Magnesium alloys with high damping, high specific strength and low density have attracted great attention in recent years. However, the application of magnesium alloys is limited by the balance between their mechanical and damping properties. The strength and plasticity of magnesium alloys with high damping performance often cannot meet the industrial requirements. Understanding the damping mechanism of magnesium alloys is significant for developing new materials with high damping and mechanical properties. In this paper, the damping mechanisms and internal factors of the damping properties of magnesium alloys are comprehensively reviewed. Some damping mechanisms have been studied by many scholars, and it has been found that they can be used to explain damping performance. Among existing damping mechanisms, the G-L dislocation theory, twin damping mechanism and interface damping mechanism are considered common. In addition, some specific long-period stacking ordered (LPSO) phases’ crystal structures are conducive to dislocation movement, which is good for improving damping performance. Usually, the damping properties of magnesium alloys are affected by some internal factors directly, such as dislocation density, solute atoms, grain texture and boundaries, etc. These internal factors affect damping performance by influencing the dissipation of energy within the crystal. Scholars are working to find novel damping mechanisms and suitable solute atoms that can improve damping performance. It is important to understand the main damping mechanisms and the internal factors for guiding the development of novel high-damping magnesium alloys.

show abstract

“…Extra vibrational damping produced in the test piece due to the presence of fatigue crack, in general, would depend on the size and properties of the crack (including the size and shape of the plastic zone around the crack tip) and distribution of stress concentration around the crack at the time it is under vibration. This extra damping caused by the presence of crack (Z Crack,N ) can be found from the difference between the measured loss factor of the cracked sample in vibration mode N (Z CrackedBeam,N ) and the measured loss factor of another sample with the same geometry and without the presence of crack at the same vibration mode N: Bovsunovsky (2004) and Goken et al (2004) have concluded in their studies that vibration damping in structures containing cracks has a tendency to decrease in response to an increase in the amplitude of vibration, whereas in structures without cracks, the level of vibrational damping stemmed from structural damping of the material, it increases along with an increase in the amplitude of vibration. They also reported that the energy wasted per unit strain in every cycle during vibration of beam-like structures (ÁV) can be considered independent of a structure's vibration frequency even if strains with large amplitude occur in the sample.…”

Section: Proposed Algorithm For Estimation Of Vibration Damping and Heat Dissipation By Crackmentioning

confidence: 99%

Using finite element to estimate vibration energy loss by cracks in thermosonic phenomenon under chaotic and non-chaotic vibrations

Riahi

Dehestani

Valipour

2014

Journal of Vibration and Control

View full text Add to dashboard Cite

Thermosonic tests are capable of detecting surface defects such as fatigue cracks. The mechanism of its operation is based on the stimulation of structural vibration of the test piece which generates detectable displacements between crack surfaces. The main problem with using a thermosonic test is the uncertainty caused by chaotic and non-reproducible vibrations of the test piece. Consequently, the study of effective parameters such as, for example, the frequency and amplitude of vibration, crack size, vibration damping around the crack, and acoustical chaos could play a major role in improving this method to make it a highly reliable non-destructive test. In this study, an algorithm has been used to estimate the wasted vibration energy caused by extra damping due to the presence of cracks in the sample. Initially, the validity of the discussed algorithm is studied and findings compared with the results of other experimental studies available in the literature. Subsequently, a simulation process of the thermosonic test in a beam in two conditions of chaotic and non-chaotic vibrations take place. Then, findings are compared with the desired algorithm. Results indicate that in a non-chaotic vibration condition, the measured wasted energy by the algorithm is confirmed by the results obtained from the finite element. However, in a chaotic vibration condition, when the crack size is large enough, there is considerable difference between the results of the finite element method and the algorithm. This difference is due to the occurrence of acoustic chaos while stimulating the test piece. The used algorithm was unable to predict this.

show abstract

Measurement of crack induced damping of cast magnesium alloy AZ91

Cited by 9 publications

References 18 publications

Influence of heat treatment on damping behaviour of the magnesium wrought alloy AZ61

Influence of heat treatment on damping behaviour of the magnesium wrought alloy AZ61

Research Progress on the Damping Mechanism of Magnesium Alloys

Using finite element to estimate vibration energy loss by cracks in thermosonic phenomenon under chaotic and non-chaotic vibrations

Contact Info

Product

Resources

About