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Structural Engineering and Mechanics
  Volume 71, Number 3, August10 2019, pages 223-232
DOI: http://dx.doi.org/10.12989/sem.2019.71.3.223
 


Size-dependent plastic buckling behavior of micro-beam structures by using conventional mechanism-based strain gradient plasticity
Amer Darvishvand and Asghar Zajkani

 
Abstract
    Since the actuators with small- scale structures may be exposed to external reciprocal actions lead to create undesirable loads causing instability, the buckling behaviors of them are interested to make reliable or accurate actions. Therefore, the purpose of this paper is to analyze plastic buckling behavior of the micro beam structures by adopting a Conventional Mechanism-based Strain Gradient plasticity (CMSG) theory. The effect of length scale on critical force is considered for three types of boundary conditions, i.e. the simply supported, cantilever and clamped - simply supported micro beams. For each case, the stability equations of the buckling are calculated to obtain related critical forces. The constitutive equation involves work hardening phenomenon through defining an index of multiple plastic hardening exponent. In addition, the Euler-Bernoulli hypothesis is used for kinematic of deflection. Corresponding to each length scale and index of the plastic work hardening, the critical forces are determined to compare them together.
 
Key Words
    conventional mechanism-based strain gradient theory; length scale; plastic buckling; micro beam
 
Address
Department of Mechanical Engineering, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran
 

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