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Communication Dans Un Congrès Année : 2020

Investigation of the sources of residual stresses on the assessment of the initial state of a thermoplastic matrix composite tube

Résumé

The use of composite materials in the automotive sector, in particular for lightweight structures, has grown steadily in the past decades. A major barrier to their increased usage is the low production rate due to a long manufacturing time, especially for thermoset matrix composites. Thermoplastic matrix composites, on the other hand, coupled with the manufacturing process Laser Assisted Tape Placement (LATP) can provide high production rates. The locally high temperatures and temperature gradients involved is one drawback of LATP, since they generate internal stress distributions and/or geometry distortions within the manufactured structure. This initial state needs to be accounted for in the design and sizing of the structures. From the bibliography, several sources of residual stresses and strains have been detected as, for example, P.P. Parlevliet [1] in his study of the literature shows. Temperature gradients along the thickness, crystallization kinetics of the thermoplastic matrix and anisotropy of the composite tube are just few examples of the causes that concur to establish the initial state of the structure. An attempt to describe the complexity of the thermal history coming from the molding process was presented by T. J. Chapman et al. [2] who analyzed the process induced residual stresses of thermoplastic matrix composite laminates. M. W. Hyer, C. Q. Rousseau [3], on the other hand, used a simple constant temperature distribution as an input to a mechanical model, in which the incompatibility between the radial and the circumferential strain plays an important role, to assess residual stresses and strains in a composite tube. In the present work an investigation of the influence and interactions of different causes of residual stresses and strains on the assess of the initial state of a thermoplastic matrix composite tube is presented. In particular, the mechanical model used, close to the one presented by [3], highlight the geometry coupled with anisotropy as a source of residual stresses and strains. The different thermal histories used as inputs to the mechanical model, enable us to understand how and how much the initial state of the tube is determined by each of the causes. It is also shown the viscoelastic effect as source of residual stresses relaxation compared to the causes of residual stresses build up.
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Dates et versions

hal-03585257 , version 1 (23-02-2022)

Identifiants

  • HAL Id : hal-03585257 , version 1

Citer

L. Di Gennaro, F. Daghia, Christophe Cluzel, Frédéric Jacquemin, Aurélien Miller. Investigation of the sources of residual stresses on the assessment of the initial state of a thermoplastic matrix composite tube. 19th European Conference on Composite Materials (ECCM19 ), Jun 2020, Nantes, France. ⟨hal-03585257⟩
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