Assessment of cure-residual strains through the thickness of carbon-epoxy laminates using FBGs Part II: Technological specimen

Abstract : This paper is a continuation of our previous study [Mulle M, Collombet F, Olivier P, Grunevald Y-H. Assessment of cure residual strains through the thickness of carbon-epoxy laminates using FBGs, part I: elementary specimen. Compos Part A 2008. doi:10.1016/j.compositesa.2008.10.008] pertaining to the assessment of autoclave cure-induced strains through the thickness of carbon-epoxy laminates. In this first part, postulates and measurement procedures were established for cure of elementary specimens. Based on these, this study undertakes investigation on what are called technological specimens. These specimens are of the beam type and contain geometrical specificities which represent typical structural issues. In-plane process-induced strains were studied through the thickness of a thick reinforced zone using several optical fibre Bragg gratings (FBGs) sensors embedded at different levels of the ply stack. A non-uniform distribution of residual strains was detected. Once cured, the technological specimen was subjected to a heating test whose cycle was comparable to the cure cycle. Thermally induced strains were measured with the embedded FBGs. The values recorded were compared with those of cure-induced residual strains and FEM simulation. Discrepancies were observed that strongly suggest the possible influence of environmental effects and the need for the calculation to take into account the through-the-thickness variability of thermal properties.
Complete list of metadatas

https://hal.archives-ouvertes.fr/hal-02194262
Contributor : Pierre Naegelen <>
Submitted on : Thursday, July 25, 2019 - 1:31:02 PM
Last modification on : Wednesday, November 13, 2019 - 4:44:11 PM

Identifiers

Citation

M. Mulle, Francis Collombet, Philippe Olivier, Redouane Zitoune, C. Huchette, et al.. Assessment of cure-residual strains through the thickness of carbon-epoxy laminates using FBGs Part II: Technological specimen. Composites Part A: Applied Science and Manufacturing, Elsevier, 2009, 40 (10), pp.1534--1544. ⟨10.1016/j.compositesa.2009.06.013⟩. ⟨hal-02194262⟩

Share

Metrics

Record views

23