tailieunhanh - Investigation of delamination and damage due to free edge effects in composite laminates using cohesive interface elements

In this study, this mode in cross-ply and angle-ply laminates has been investigated using a cohesive zone model. The advantage of this method is the possibility of modeling the delamination initiation and propagation without requirement to the presence of initial crack and remeshing. | Investigation of delamination and damage due to free edge effects in composite laminates using cohesive interface elements Engineering Solid Mechanics 2 2014 101-118 Contents lists available at GrowingScience Engineering Solid Mechanics homepage esm Investigation of delamination and damage due to free edge effects in composite laminates using cohesive interface elements Bijan Mohammadi and Davood Salimi-Majd School of Mechanical Engineering Iran University of Science amp Technology Narmak 16846-13114 Tehran Iran ART ICLE INFO ABSTRACT Article history Composite materials due to high strength and stiffness to their weight ratio are widely used in Received September 20 2013 different structures. Hence it is necessary to predict their failure behavior under loading. The Received in Revised form delamination due to interlaminar stresses at free edges is one of the most important damage October 14 2013 modes in laminated composites. In this study this mode in cross-ply and angle-ply laminates Accepted 9 February 2014 Available online has been investigated using a cohesive zone model. The advantage of this method is the 12 February 2014 possibility of modeling the delamination initiation and propagation without requirement to the Keywords presence of initial crack and remeshing. Hence at first an interface element based on bilinear Delamination cohesive law was implemented in Ansys. Next laminated plates with different lay-ups under Cohesive zone model uniaxial tension loading were modeled. Also Hashin s failure criteria were used to predict ply Damage variable damage initiation. Numerical results show that in angle-ply laminates with small fiber angle Matrix cracking orientation delamination in the shear mode is the dominant mode in the loss of structural Free edge effects strength. The numerical and experimental results for global load-displacement response show a good agreement. Also numerical results show that in cross-ply laminates even under