24-153 Selection Method for Stacking Sequences of
il y a 3 semaines
Doctorat, 36 mois
- Temps plein
- Aucune expérience exigée
- Maitrise, IEP, IUP, Bac+4
- Mechanical and thermal engineering
**Mission**:
The work focuses on propellant tanks (liquid oxygen, liquid hydrogen, liquid methane) used for space launcher engines. These tanks can have various dimensions, withstand internal pressures of a few bars, and endure the general loads of a launcher in addition to the internal pressure applied. Given the stored fluids, the materials experience significant thermomechanical loads. These structural requirements make lightweight alloys highly competitive for this type of structure. The use a composite material is primarily driven by its specific properties. Today, the choice of a composite material involves the use of a liner to ensure sealing. However, this liner penalizes performance (strength-to-weight ratio) specifically for low-pressure tanks, where the minimum thickness for mechanical strength is low. This liner, whether made of titanium or polymer, also impacts the cost of manufacturing the part.
The state of the art highlights that the leakage process is influenced by several design parameters:
- Material properties, especially those of the matrix and interfaces.
- The presence of defects related to the manufacturing process.
- The thickness of the laminate (which influences mass).
- Ply orientations and interactions of cracks between adjacent plies.
- Ply thicknesses.
Regarding the last point, numerous studies have shown that the use of thin plies can delay the onset of cracking (Gudmundson and Alpman 2000; Parvizi, Garrett, and Bailey 1978; Leguillon 2002). However, exclusively using thin plies is not feasible due to manufacturing cost reasons. Recent designs are moving towards incorporating a few thin plies within a laminate containing mostly standard thickness plies. However, determining the placement in the laminate sequence and orientations of these thin plies is challenging, primarily due to crack interaction phenomena between adjacent plies. Therefore, choosing all design parameters requires a predictive model that is both faithful to complex physical phenomena and computationally efficient to enable an iterative process (parametric analysis, optimization).
Objectives and steps:
The first objective will be to propose a methodology to assist in the selection of laminates (ply orientations and thicknesses) for a given set of specifications (planar stress flow, temperature, and permeability). This methodology may rely on sensitivity analyses and/or an optimization procedure. In order to propose robust solutions that take into account certain uncertainties, such as the permeability requirement level, Pareto diagrams (e.g., mass versus permeability) can be plotted. Similarly, considering qualitative manufacturing costs may lead to Pareto diagrams of mass versus cost.
In a second step, the obtained solutions will be compared to those tested in previous studies to build and identify the model for assessing the confidence that can be associated with each solution. This analysis will also help define new configurations of tubular specimens to be tested in order to expand the model's confidence domain.
The third objective aims to integrate the role of manufacturing defects specific to the Automated Fiber Placement (AFP) process chosen for this work into the design process. Starting with a few targeted virtual and physical tests followed by microscopy or microtomography observations, the goal will be to evaluate the impact of defects (gaps and overlaps) on crack kinetics, especially on the effects of interaction between plies. Using industrial partner databases and literature, it will be possible to incorporate the influence of these defects into the predictive model.
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**Profil**:
Master degree in mechanics, mechanical engineering or material science
**Laboratoire**:
I2M
**Message from Phd Team**:
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