Matches in UGent Biblio for { ?s ?p Satin woven composites can be seen as a series of connected unit cells with a definite length and width. Over the length and width of one unit cell, local strain fields can vary significantly due to the yarn interlacing pattern. By using fibre Bragg grating (FBG) sensors one can measure both surface and internal local composite strain variations. However, it is not possible to directly specify the exact spatial position of the minimum and maximum strain over the gauge length of the FBG. In this paper, the strain concentrations acting on the sensor are located with the help of experimental DIC (Digital Image Correlation) technique and meso-FE simulations for surface and the inside of the test coupons, respectively. Coated high strength FBGs are used to study the deformation of thermo-plastic 5-harness satin weave composite test specimens. Maximum and minimum strain envelopes from spectral analysis of the FBG sensors, DIC strain readings and FE-modelling are presented and compared for test coupons stretched quasi statically till 0.5% strain. It is found that minimum and maximum strain values for the different methods match well. Additionally during cyclic loading the Bragg sensors accurately measure global strain states, moreover, they tend to be very feasible for detecting permanent deformations caused by local cracking.. }
Showing items 1 to 1 of
1
with 100 items per page.
- aggregation abstract "Satin woven composites can be seen as a series of connected unit cells with a definite length and width. Over the length and width of one unit cell, local strain fields can vary significantly due to the yarn interlacing pattern. By using fibre Bragg grating (FBG) sensors one can measure both surface and internal local composite strain variations. However, it is not possible to directly specify the exact spatial position of the minimum and maximum strain over the gauge length of the FBG. In this paper, the strain concentrations acting on the sensor are located with the help of experimental DIC (Digital Image Correlation) technique and meso-FE simulations for surface and the inside of the test coupons, respectively. Coated high strength FBGs are used to study the deformation of thermo-plastic 5-harness satin weave composite test specimens. Maximum and minimum strain envelopes from spectral analysis of the FBG sensors, DIC strain readings and FE-modelling are presented and compared for test coupons stretched quasi statically till 0.5% strain. It is found that minimum and maximum strain values for the different methods match well. Additionally during cyclic loading the Bragg sensors accurately measure global strain states, moreover, they tend to be very feasible for detecting permanent deformations caused by local cracking.".