Investigation of Thermal Gradient Share in Buckling of a Loaded Bi-material Column with Interface Crack

Buckling is one of the most complicated concepts in mechanical engineering. Buckling often happens by compressive loads on thin structures. Thermal gradientbetween two ends of a column may cause a deflection in it. This will add an extra deformation to the one provided by compressive loads on the column. Thisphenomenon occurs when two ends of the column are at different temperatures, which can be seen at various structures. As a result of the considered temperature gradients, the critical load of the column will decrease . In the current paper various columns are modeled andeffect of thermal gradient and compressive load and other parameter on the Bi-material columns are studied. In other words influence of compressive load andtemperature gradient on critical load of Bi-material columns with interface crack, are investigated. Effect of change in each parameter on critical load of column andcrack opening was investigated. This means in first step, only thermal gradient was applied on the model and inthe next step; only effect of mechanical loading was studied. On the other hand artificial neural network (ANN) was used to extend the results to a bigger rangeof temperature conditions through the columns. Finally, discussion was done about results procedure. It will beseen ANN and finite element results have a good agreement with each other. It’s been seen, the thermal effects can have a significant share in buckling of the column. It is important to consider this effect in designing process and find a way to reduce it.

Keywords:

Thermal gradient , buckling , crack , finite element , ANN