Damping of Superelastic NiTi-Alloys under Torsional Loading

Predki, W.; Kloenne, Martin

doi:10.4028/www.scientific.net/msf.394-395.115

Cited by 3 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From these test results, the internal dissipated energy and specific damping capacity (SDC, ) were calculated and are compared in table 3. The internal dissipated energy can be obtained by calculating the hysteretic looped area, and the specific damping capacity is defined as the ratio of internal dissipated energy to external total energy [15]. Under the same loading conditions, the hybrid-MI shows outstanding isolation capability due to the characteristics of the mesh isolator itself, as well as the pseudoelasticity of the SE508 SMA wire compared with other isolators.…”

Section: Quasi-static Test Resultsmentioning

confidence: 99%

Development of a three-axis hybrid mesh isolator using the pseudoelasticity of a shape memory alloy

Youn

Jang

Han

2011

Smart Mater. Struct.

View full text Add to dashboard Cite

Launch vehicles and satellites experience severe vibration and pyroshock loads during flight phases. In particular, intense pyroshock, which is generated by the actuation of separation devices, can cause malfunctions in the electronic components in launch vehicles and satellites, potentially resulting in catastrophic failure during flight. This paper introduces a new three-axis hybrid mesh isolator using the pseudoelasticity of a shape memory alloy wire that was manufactured and tested to attenuate pyroshock and vibration transmitted to the electronic components. To characterize the isolation capability, quasi-static loading tests were performed; the test results showed that the pseudoelastic effect of the shape memory alloy wire significantly absorbs energy due to the stress-induced phase transformation. The ground pyroshock test results showed a remarkable pyroshock load attenuation of the hybrid mesh isolator in all frequency ranges. The dynamic characteristics and vibration isolation performances of the mesh isolators were also verified by random vibration tests. The healthiness of the hybrid mesh isolator was also studied under a harsh vibration loading level, and the results confirmed its wide applicability without degradation of the isolation capability.

show abstract

Section: Quasi-static Test Resultsmentioning

confidence: 99%

Development of a three-axis hybrid mesh isolator using the pseudoelasticity of a shape memory alloy

Youn

Jang

Han

2011

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

Damping Factors and Fatigue Notch Factors of Pseudoelastic NiTi‐Shape Memory Alloys

Predki

Knopik

Klönne³

2004

Materialwissenschaft Werkst

View full text Add to dashboard Cite

Pseudoelastic NiTi-shape memory alloys (SMAs) provide a high damping capacity and can be used in order to achieve a reduction of peak loads being caused by unexpected shock loading. These "pseudoelastic" properties are related to the formation of martensite M from austenite A, which has been induced by stress; they allow to refer to SMAs as functional materials. Furthermore, these functional materials can operate at high stresses and thus, have to withstand severe mechanical loadings like classical structural materials. In combination, these characteristics provide opportunities for technical applications, e.g., to reduce vibrations or to reduce peak loads caused by shock loading. An extensive knowledge of the functional and structural fatigue behaviour of the material is required to design SMA components. NiTi hollow shaft samples and solid shaft samples have been tested under cyclic torsional loading conditions in a load-controlled mode. By using these two geometries the influence of the sample geometry on the fatigue behaviour can be investigated. In addition, a test programme has been elaborated in order to investigate the behaviour of the material when subjected to bending. The experimental data have been evaluated describing the transformation behaviour induced by stress concerning transformation stress, apparent shear modulus of the austenite G A and apparent stiffness s Ms (describing the slope of the shear stress-strain-curve in the transformation range G A-M ). These parameters naturally depend on the cycle number, the load amplitude as well as the temperature. Engineering failures are often associated with the presence of notches. In this context, torsion tests on notched samples are planned to be carried out in order to assess the resulting data based on the results obtained from the notch free samples. This will allow to derive simple design rules based on fatigue notch factors, which are needed for engineering design.KEYWORDS

show abstract

Damping Couplings with Elements of Pseudoelastic NiTi Shape Memory Alloys

et al. 2006

View full text Add to dashboard Cite

A coupling device for damping within a drive train is presented. For conventional damping couplings, damping is often realized by the dissipation of energy due to material damping or friction. In opposite to this, the damping effect of the presented coupling is based on the dissipated energy during the stress induced phase transformation of pseudoelastic NiTi shape memory alloys. In this contribution the design principles, experimental results, and a numerical simulation using the material law for shape memory alloys developed by Raniecki B. Lexcellent C. and Tanaka K. (Arch Mech 44(3:261-284)) are presented.

show abstract

Damping of Superelastic NiTi-Alloys under Torsional Loading

Cited by 3 publications

References 0 publications

Development of a three-axis hybrid mesh isolator using the pseudoelasticity of a shape memory alloy

Development of a three-axis hybrid mesh isolator using the pseudoelasticity of a shape memory alloy

Damping Factors and Fatigue Notch Factors of Pseudoelastic NiTi‐Shape Memory Alloys

Damping Couplings with Elements of Pseudoelastic NiTi Shape Memory Alloys

Contact Info

Product

Resources

About