Papers by Keyword: Lamination Theory

Abstract: To enable reliable prediction of the stress-strain behaviour of GFRP-confined concrete, the mechanical properties of GFRP tube needs to be properly understood and modelled. This paper presents test results of an experimental investigation carried out on 400-mm-diameter and 800-mm-height concrete-filled fiber reinforced polymer tubes. A total of four GFRP-confined concrete columns were subjected to concentric compression to identify the properties of GFRP tube. The performance of GFRP tubes in the tests were compared with the calculation results based on the classical lamination theory. In addition, more in-depth interpretations of the test results and further tests need to be refined in future tests to better capture the properties of the GFRP tube.

Abstract: This paper describes an effect of fluctuation in fiber orientation on Young’s modulus of the so-called green composites. The composites were reinforced with slivers of high-strength natural fibers extracted from plants named curaua. Then a surface optical micrograph of the composites with the fiber fluctuation was obtained. The micrograph was divided into many fine segments, and the fiber orientation angle in each segment was measured. Then, a new concept which takes account of the fiber orientation angles as a probability distribution, was proposed for prediction of the Young’s modulus. The results showed that the predicted Young’s moduli were in a good agreement with the experimental results.

Abstract: A new method is proposed in this paper for robust deign of configuration of multiple layers. The present design tool may enable the designers to estimate the flexural strength for the target combination of lamina. In line with these objectives, an experimental analysis was performed for 3 kinds of combinations of the number of orientation angles and 21 kinds of configurations of the symmetric 26 layers. The experimental results are compared with the theoretical considerations. From the viewpoint of robust design of configurations, the relation between flexural fracture strength and equivalent engineering modulus was also investigated. Finally, the procedure of practical robust design of composite laminate is also proposed.