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Politecnico di Torino
Academic Year 2017/18
01NHRMT
Materials for aerospace
Master of science-level of the Bologna process in Aerospace Engineering - Torino
Teacher Status SSD Les Ex Lab Tut Years teaching
Biamino Sara ORARIO RICEVIMENTO O2 ING-IND/22 48 12 0 0 7
SSD CFU Activities Area context
ING-IND/22 6 D - A scelta dello studente A scelta dello studente
Subject fundamentals
The aeronautics-aerospace industrial sector continuously needs new materials and innovative solutions able to match very strict requirements in order to improve product reliability and competitiveness. To achieve this ambitious goal, aerospace engineers must achieve a deep knowledge about materials and basic relationships between the several structural levels (compositional, nanostructural, microstructural, macrostructural) of the materials and their properties, in terms not only of mechanical, but also physico-chemical (durability, thermal, optical, magnetic, and so on) features. Such basic knowledge is a fundamental tool for understanding innovation but also to play a leading role in the study and exploitation of new materials for this advanced field of application.
Expected learning outcomes
The main aim is to supply the student with robust and versatile tools allowing him to consciously approach the large number of engineering materials for aerospace applications. Particularly, keeping in mind the fast penetration of innovative materials and technologies related to this specific industrial field, advanced knowledge is required, far from a simple descriptive approach, able to supply general guidelines to follow innovation, but also, partially, to contribute to it.
The student should then:
- know the relationships between compositional and structural features of the materials and their own properties, for not only structural but generally functional applications;
- know the basic guidelines for materials selection in view of a specific application and able to satisfy the design requirements;
- know the strategies exploitable to improve the material response or to assure it with a suitable reliability and durability during use;
- be able to select materials for a specific component or structure, that is, to match materials to design;
- be able to critically compare old and new materials and technological solutions and to rank them, in order to consciously exploit innovation when required;
- be able to discuss with experts in other fields (like materials scientists) for the design of new materials and related technologies for aerospace applications;
- know a basic English vocabulary on Materials Science and Technology.
Prerequisites / Assumed knowledge
The student is required to have a large, basic knowledge on materials science and technology, starting from atomic and compositional data till to the main properties at the macro-scale. In particular, he must own a robust background about materials structure at the different scales, about glassy and crystalline solids, and their atomic/microstructural defects. He must know the different classes of materials and the major differences in terms of composition and properties. He must have fundamental knowledge on mechanical behaviour of the materials as well as on their many other (thermal, optical, magnetic...) properties. Finally he must know the main processes for materials production and transformation.
Contents
High-temperature materials. Metallic materials for aeronautic and space propulsion: nickel and cobalt superalloys and the demanding for moving devices in turbines Thermal barrier coatings (TBC-EBC). Compositions, properties, processes and design. Durability . The introduction of cerami matrix composites (h. 13)
Intermetallic materials and the subject of rotating structure lightening: gamma-TiAl case study for the production of low pressure turbine blades. The adding value of additive manufacturing technologies for the production of metallic components (h.6)
High strength steels and their application in gearbox and transmission devices. Metallic materials for aeronautic and space structures: high performing aluminum and magnesium alloys and forming processes for complex components with large dimensions; titanium alloys and the diffusion bonding process as well as supeplastic forming. The topic of the joining between metallic components. Metal matrix composite. (h. 8)
Polymeric materials and polymeric matrix composites for the development of structures with high specific strength: polymers for special joining; high strength polymeric composites for the development of high performing flying devices. Inflatable structures and the topic of functionally graded materials (FGM). Examples of devices in polymeric matrix composites (h.6)
Materials for rigid and inflatable structures. Radiation and several other type of shield. Low-permeability materials (h.3)
Thermal protection systems (TPS). Passive (Reusable) systems: materials, working conditions, problems, solutions. Case of Space Shuttle TPS. Materials for repair in space. Self-healing. UHTC (Ultra-High Temperature Ceramics) and sharp profiles: compositions, solutions, reliability. Active TPS: ablation and ablative materials for low, medium and high flux conditions (h.6)
Durability in space operative conditions: the main degradation phenomena and possible solutions (h.3).
Smart Materials: sensors and actuators. Piezoelectrics, ionic conductors. SMA, magnetostrictors. Application in the field of space human–robotic for extra vehicular activities. (h.4).
Transparent materials (optic and optoelectronic applications): optical, rigid or flexible windows. Radomes. Very low CTE materials: the case of telescope mirrors. (h.4)
Nanomaterials; an introduction to the nanoscaled materials and processes (h.4)
Design criteria and material selection. Ashby diagrams . (h.3)
Texts, readings, handouts and other learning resources
The slides used for the lessons will be available in advance and books for eventual in deep investigation of particular subjects will be suggested by the teacher during the lessons.
Assessment and grading criteria
The examination is only written. The examination will last 2 hrs. Books and notes will not be available. The student will have to answer to 16 questions in order to witness his/her knowledge of the contents of the course. Each question has a value of 2. Above 30 means that the laude is reached. The student may be requested to provide an open answer or to select an option among given possibilities. A facsimile examination form will be available on the "Portale della didattica".

Programma definitivo per l'A.A.2017/18
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