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Laminated composite plates are widely used in many industrial structures because of their lower weight compared to metal. In this paper, a buckling analysis is carried out to investigate the response of variable-angle-laminated composite plate with holes and geometric imperfections subjected to compression loading. The angle variation law of the reference fibre path and the method to generate series of new path are presented. Models of variable orientation laminates with and without central holes are set up by Abaqus. In-plane stress and buckling load of laminates subjected to compression loading are analysed and the effect of central hole is investigated. Results show that maximum in-plane stress of variable-angle laminates is reduced remarkably and buckling load is increased significantly. Meanwhile, the negative influence of central holes on the stress concentration and buckling behaviour is weakened. However, stiffness of laminates with variable fibre orientation is decreased. [ABSTRACT FROM AUTHOR]

This study focused on the damage analysis of Q345 steel in the tensile test with acoustic emission technique. First, Q345 steel-plate specimens in the tensile test were monitored with acoustic emission, and two typical acoustic emission signals were obtained based on the test data: (i) the lower amplitude and higher energy acoustic emission signals in yielding stage and (ii) the higher amplitude and lower energy acoustic emission signals in micro-plastic deformation and strain hardening stage. Second, the related acoustic emission behaviour and deformation properties were analysed, and the results showed that the former acoustic emission signals could be attributed to the dislocation multiplication and unpinning from Cottrell atmosphere or dislocation tangling, while the latter acoustic emission signals might be generated by the simultaneous motion of high-density dislocations during Luders band propagation. [ABSTRACT FROM AUTHOR]