Natural Frequencies of Multi-Layer Composite Plate with Embedded Shape Memory Alloy Wires

1998 ◽  
Vol 9 (3) ◽  
pp. 232-237 ◽  
Author(s):  
W. Ostachowicz ◽  
M. Krawczuk ◽  
A. Zak
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Composite Plate ◽  
Natural Frequencies ◽  
Layer Composite

Flexural and free vibration control of smart epoxy composite beams using shape memory alloy wires actuator

2020 ◽  
Vol 31 (13) ◽  
pp. 1557-1566 ◽  
Author(s):  
Mohsen Gol Zardian ◽  
Navid Moslemi ◽  
Farzin Mozafari ◽  
Soheil Gohari ◽  
Mohd Yazid Yahya ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Free Vibration ◽  
Shape Memory ◽  
Natural Frequencies ◽  
Composite Beams ◽  
Dynamic Responses ◽  
Beam Deflection ◽  
Engineering Structures ◽  
Fiber Fractions ◽  
Modes Of Vibration

Shape memory alloys are increasingly used in numerous smart engineering structures. This study experimentally investigates static flexural and free vibration characteristics of composite beams reinforced with shape memory alloy wires. The key to this study is using shape memory alloy fibers as a means for influencing and tuning the static and dynamic responses of structures. A series of static three-point bending and modal experiments is performed to capture the capability of shape memory alloy wires in controlling the static and dynamic responses of a reinforced beam. Static and dynamic behaviors of the fiber-reinforced beam with different volumetric fiber fractions are examined. Before heat excitation, increasing the number of shape memory alloy wires leads to higher beam stiffness and lower beam deflection. However, with both heat activation and the higher number of shape memory alloy wires, beam deflection is significantly reduced. The modal vibration tests demonstrated that when shape memory alloy wires are not activated, the magnitude of natural frequencies slightly decreases by increasing the number of shape memory alloy wires. However, with heat excitation, the higher number of shape memory alloy wires, in contrast, increases the magnitude of natural frequencies. Furthermore, the higher number of activated shape memory alloy wires shows to predominantly increase the magnitude of higher modes of vibration rather than lower modes.

scholarly journals Vibrational Analysis of Composite Beam Embedded with Nitinol Shape Memory Alloy Wires

2018 ◽  
Vol 7 (3.4) ◽  
pp. 143
Author(s):  
Omer Muwafaq Mohmmed Ali ◽  
Rawaa Hamid Mohammed Al-Kalali ◽  
Ethar Mohamed Mahdi Mubarak
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Frequency Response ◽  
Response Curve ◽  
Natural Frequencies ◽  
Damping Ratio ◽  
Vibrational Analysis ◽  
Laminated Composite ◽  
Vibration Modes ◽  
Frequency Response Curve

In this paper, laminated composite materials were hybridized with fibers (E-glass) and shape memory alloy wires which considered a smart material. The effect of changing frequency on the (acceleration- frequency) response curve, the damping ratio of the vibration modes, the natural frequencies of the vibration mode, the effect of shape memory alloy wires number on the damping characteristics were studied. Hand lay-up technique was used to prepare the specimens, epoxy resin type was used as a matrix reinforced by fiber, E-glass. The specimens were manufactured by stacking 2 layers of fibers. Shape memory alloy, type Nitinol (nickel-titanium) having a diameter (1 and 2mm), was used to manufacture the specimens by embedding (1,2 and 3) wires into epoxy. Experimentally, the acceleration- frequency response curve was plotted for the vibration modes, this curve was used to measure the natural frequencies of the vibration modes and calculate the damping ratio of the vibration modes. ANSYS 15- APDL was used to determine the mode shape and find the natural frequencies of the vibration modes then compared with the experimental results. The results illustrated that, for all specimens increasing the natural frequency leads to decreasing the damping ratio. Increasing the number of shape memory alloy wires leads to increase the values of the damping ratio of the vibration modes and the natural frequencies of the vibration modes at room temperature. 

scholarly journals Active control of strain in a composite plate using shape memory alloy actuators

2014 ◽  
Vol 11 (1) ◽  
pp. 25-39 ◽  
Author(s):  
Ermira J. Abdullah ◽  
Dayang L. Majid ◽  
Fairuz I. Romli ◽  
Priyanka S. Gaikwad ◽  
Lim G. Yuan ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Active Control ◽  
Composite Plate

Vibration Characteristics of Composite Plate Embedded with Shape Memory Alloy at Elevated Temperature

2013 ◽  
Vol 393 ◽  
pp. 655-660 ◽  
Author(s):  
Izzuddin Zaman ◽  
Bukhari Manshoor ◽  
Amir Khalid ◽  
Sherif Araby ◽  
Mohd Imran bin Ghazali
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Composite Structures ◽  
Composite Plate ◽  
Free Vibration Analysis ◽  
Composite Plates ◽  
Vibration Characteristics ◽  
Modal Testing ◽  
Phase Transformation Temperature ◽  
Wide Range

Unique functional material of shape memory alloy has attracted tremendous interest from researches, thus has been broadly investigated for a wide range application. Current research effort extends the use of SMA for the design of smart composite structures due to its shape memory effect, pseudo-elasticity and high damping capability. This paper presents an assessment of applications of the SMA materials for structural vibration controls, where the influences of SMA as reinforcement in the composite plate at different temperature are investigated. Four cases of composite plate are studied, which two of them are SMA-based composite fabricated at 0° and 45° angles, and the other two plates are neat (without SMA wires) and built with local stiffener. By using modal testing, the free vibration analysis is carried out to determine the vibration characteristics of composite plates. The results show that infusing SMA wires into composites increased the natural frequencies of the plate considerably, while decreased slightly for damping percentage. However, when SMA wires are heated, the damping percentage improved tremendously due to the phase transformation temperature of SMA from martensite to austenite. The outcome of this study reveals the potential of SMA materials in active vibration control.

scholarly journals Buckling Strengths of Composite Plate Using Shape Memory Alloy under In-Plane Shear

2021 ◽  
Vol 12 (2) ◽  
pp. 1729-1738
Author(s):  
Yatendra Saraswat, Et. al.
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Composite Plate ◽  
Shear Deformation Theory ◽  
Shear Load ◽  
Plane Shear ◽  
Alloy Plate ◽  
First Order ◽  
Circular Cutout ◽  
Ansys Workbench

In this article, we analyze the strength and buckling response in the plane shear load fixed at the corner of the composite plate. The fem is formulated is done on the basis of first-order shear deformation theory and assumptions of von Karman. The Newton-Raphson technique is considered to analyze the non-linearity algebraic equation. The effect of shape memory alloy in shear load and buckling response is discussed. In this study we analyze the two cases in the first simple carbon/epoxy plate is analyze and then we use the shape memory wire embedded in the plate which is about 1% of the volume of the plate and studies the buckling response effect on the plate. In the second case we use Shape Memory Alloy plate and loading but a circular cutout at the middle of the plate this case we analyze for both with the use of shape memory alloy and without the use of shape memory. It is observed that the shape memory alloy increases the strength of the plate in both cases. The whole simulations are done using Ansys workbench software v 2020R2.

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