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Structural Engineering and Mechanics
  Volume 79, Number 3, August10 2021, pages 301-307
DOI: https://doi.org/10.12989/sem.2021.79.3.301
 


Effect of hybrid thermal cycling shocks on the mechanical properties of structural composites
Abbas Bayat, Mehrnoosh Damircheli and Masood Esmkhani

 
Abstract
    In the present research, tensile and flexural mechanical properties of glass epoxy structural composites under simultaneous thermal cycling loading and thermal shocks called hybrid thermal cycling shocks, have been studied. A series of tensile and flexural tests under static and hybrid thermal loading conditions (15 and 30 thermal cycles with -70oC (Degrees Celsius) and +100oC (Degrees Celsius) thermal shocks), were applied on the structural composite specimens and the obtained results are fully compared and investigated. It was found that shocks have a more effective role in changing stiffness in comparison to cycles but the tensile strength of glass/epoxy composites was influenced by the hybrid thermal loads more sensible. For instance, tensile strength was reduced by 12.1% under 30 cycles and thermal shocks. In addition, the flexural bending strength and stiffness were decreased in comparison to static loading conditions. The flexural bending strength and stiffness under hybrid thermal loadings were changed and reduced by 27.64% and 7.2% under 30 cycles under thermal shocks respectively.
 
Key Words
    hybrid thermal loads; mechanical properties; structural composites; thermal cycles; thermal shocks
 
Address
Abbas Bayat: Department of Mechanical Engineering, Shahr-e-Qods Branch, Islamic Azad University, Tehran, Iran
Mehrnoosh Damircheli: Department of Mechanical Engineering, Shahr-e-Qods Branch, Islamic Azad University, Tehran, Iran; Department of Mechanical Engineering, Temple University, Philadelphia, Pennsylvania, 19122, USA
Masood Esmkhani: Center of Excellence in Experimental Solid Mechanics and Dynamics, School of Mechanical Engineering, Iran University of Science and Technology, 16846-13114, Tehran, Iran
 

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