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Smart Structures and Systems
  Volume 28, Number 6, December 2021 , pages 745-760
DOI: https://doi.org/10.12989/sss.2021.28.6.745
 


An algorithm for quantifying dynamic buckling and post-buckling behavior of delaminated FRP plates with a rectangular hole stiffened by smart (SMA) stitches
Ghazaleh Soltanieh and Michael C.H. Yam

 
Abstract
    Dynamic buckling of structure is one of the failure modes that needs to be considered since it may result in catastrophic failure of the structure in a short period of time. For a thin fiber-reinforced polymer (FRP) plate under compression, buckling is an inherent hazard which will be intensified by the existence of defects like holes, cracks, and delamination. On the other hand, the growth of the delamination is another prime concern for thin FRP plates. In the current paper, reinforcing the plates against buckling is realized by using SMA wires in the form of stitches. A numerical framework is proposed to simulate the dynamic instability emphasizing the effect of the SMA stitches in suppressing delamination growth. The suggested algorithm is more accurate than the other methods when considering the transformation point of the SMA wires and the modeling of the cohesive zone using simple and yet reliable technique. The computational design of the method by producing the line by line orders leads to a simple algorithm for simulating the super-elastic behavior. The Lagoudas constitutive model of the SMA material is implemented in the form of user material subroutines (VUMAT). The normal bilinear spring model is used to reproduce the cohesive zone behavior. The nonlinear finite element formulation is programmed into FORTRAN using the Newmark-beta numerical time-integration approach. The obtained results are compared with the results obtained by the finite element method using ABAQUS/Explicit solver. The obtained results by the proposed algorithm and those by ABAQUS are in good agreement.
 
Key Words
    Ari-Gur and Simonetta criterion; cohesive zone model; delamination; dynamic Buckling; FRP; shape memory alloy; stitches
 
Address
(1) Ghazaleh Soltanieh:
Department of Building and Real Estate, Hong Kong Polytechnic University, Hong Kong, China;
(2) Michael C.H. Yam:
The Chinese National Engineering Research Center (CNERC), 11 Yuk Choi Rd, Hung Hom, Hong Kong, China.
 

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