Analysis of Adhesively Bonded Composite Single Lap Joints with Wrinkled Interfaces
Date Issued
2015
Date
2015
Author(s)
Chiu, Pei-Han
Abstract
This research carried on a series of experiments and finite element simulations. Improved structural analysis of wind turbine blade airfoil trailing structural adhesive bonding area was highlighted. Due to manufacturing wind turbine blades was time consuming and costly. In order to simplify the actual situation, simple single lap specimen was used to match the blade airfoil trailing edge bonding situation. In the experiment part, Seemann Composite Resin Infusion Molding Process (SCRIMP) method was used for composite panels fabrication. In the progress of laying glass fabrics, Metallic wires serving as the reinforcement were placed on the top of the fabrics. This process not only maintains the continuity of the fibers in the composite material but also creates geometrically non-flat surface. The purpose of the process was to enhance the shear and peeling strength between the composite and the structural adhesive. Single lap specimens are made following the international standard ASTM D 5868-01 and subjected to static tensile tests. From the experimental results, one of specimens with reinforcement layer had shown better strain energy in bonded area. Finite element simulation part was using commercial finite element software Abaqus. Simplified two-dimensional finite element models were constructed and studied for understanding the stress distribution within the adhesive. Peeling stress and shear stress along the node of the top-line and centerline at structural adhesive part were recorded to observe the stress transferring situation. Then use the Hashin criteria and Cohesive criteria modify numerical model. Make damage prediction and compare the strength of each shear test specimens. The result of simulations and experiments would be compared and discussed. Review the error caused by the experimental factors and propose how to design better specimen. Finally, the study according to the manufacturing process of wind turbine blades discussed how to integrate the experimental method into the blade manufacture. The improvement of wind turbine blades manufacture would enhance the shear strength of the wind turbine blade airfoil trailing edge and reduce the blade airfoil trailing edge failure by fatal peeling stress and shear stress efficiently. Let the wind turbine blade achieve the purpose of increasing the useful life.
Subjects
Wind turbine blade
Simple single lap
Wrinkled interfaces
Shear test
Type
thesis
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