Analytical investigation of composite sandwich beams filled with shape memory polymer corrugated core

Akbari Azar, S ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1007/s11012-019-01042-y
  3. Publisher: Springer Netherlands , 2019
  4. Abstract:
  5. Shape memory polymers (SMPs) are a class of smart materials which can recover their shape even after many shape changes in application of an external stimulus. In this paper, flexural behavior of a composite beam, constructed of a corrugated part filled with SMPs, is studied. This composite beam is applicable in sensor and actuator applications. Since the corrugated profiles display higher stiffness-to-mass ratio in the transverse to the corrugation direction, the beams with a corrugated part along the transverse direction are stiffer than ones with a corrugated part along the length. Employing a developed constitutive model for SMPs and the Euler–Bernoulli beam theory, the behavior of the composite beam is studied. Since the utilized constitutive model is in the integral form, the finite-difference-method is used for discretizing the equations. It is shown that load capacity is increased in both composite beams compared to a pure SMP beam. This bigger load capacity is obtained by a low decrease in shape fixity. In addition, for different corrugated shapes (trapezoidal, pseudo-sinusoidal and triangular) with the same SMP content, the beam response is obtained. Finally, the results of the constrained stress-recovery are obtained and the effects of mechanical properties on its behavior, are studied. © 2019, Springer Nature B.V
  6. Keywords:
  7. Composite beam ; Corrugation direction ; Euler–Bernoulli beam theory ; Shape memory polymer (SMP) ; Composite beams and girders ; Constitutive models ; Filled polymers ; Finite difference method ; Analytical investigations ; Bernoulli beam theory ; Composite sandwich beam ; Corrugated beam ; Sensor and actuators ; Stiffness-to-mass ratio ; Shape-memory polymer
  8. Source: Meccanica ; Volume 54, Issue 10 , 2019 , Pages 1647-1661 ; 00256455 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s11012-019-01042-y