Composite Materials
Course Description:
Technical background and development of composite materials. Production procedures. Mechanical behavior of composite materials. Hooke's law for orthotropic and anisotropic materials. Rule of mixtures. Micromechanical and macromechanical properties. Membrane, bending and combined loading of laminates. Failure criteria for plies and laminates. Experimental procedures for determining the properties of constituent materials, plies and laminates. Fracture mechanics of composite materials. Viscoelastic behavior. Analysis of damping. Aging and fatigue. Interlaminar stresses and delamination criteria. Hygrothermal behavior. Analysis of structures made from composites. Applications using the finite element method.
- Semester 9
- Teaching hours 3
Prerequisite Knowledge
Συνιστάται στους φοιτητές να έχουν τις βασικές γνώσεις Μηχανικής.Course Units
| # | Title | Description | Hours |
|---|---|---|---|
| 1 | Introduction | Technical background and development of composite materials. Production procedures. | 1Χ3=3 |
| 2 | Mechanical behavior of FRP. | Hooke's law for orthotropic and anisotropic materials. Rule of mixtures. | 1Χ3=3 |
| 3 | Mechanical properties | Micromechanical and macromechanical properties. Properties of plies, and laminates | 1Χ3=3 |
| 4 | Axial and bending behavior | Membrane, bending and combined loading of laminates | 1Χ3=3 |
| 5 | Failure criteria | Failure criteria for plies and laminates. Maximum stress and maximum strain criteria, Tsai-Hill and Tsai-Wu criteria. | 1Χ3=3 |
| 6 | Experimental procedures for FRP | Experimental procedures for determining the properties of constituent materials, plies and laminates. | 1Χ3=3 |
| 7 | Fracture of FRP | Fracture mechanics of composite materials. Criteria Whitney-Nuismer | 1Χ3=3 |
| 8 | Viscoelastic behavior | Viscoelastic behavior. Analysis of damping. | 1Χ3=3 |
| 9 | Aging and fatigue | Aging and fatigue of FRP. The time-temperature scale | 1Χ3=3 |
| 10 | Interlaminar stresses | Interlaminar stresses and delamination criteria | 1Χ3=3 |
| 11 | Hygrothermal behavior | Hygrothermal behavior. | 1Χ3=3 |
| 12 | FE Applications on FRP | Examples with 2D Laminate plate elements (Layered elements) | 2Χ3=6 |
Learning Objectives
- to determine the basic characteristics of the mechanical behavior of FRP materials and the stress state of FRP plies and laminates,
- to deal with ply failure, delamination failure, ageing, fracture fatigue and hygrothermal effects of FRP materials,
- to gain the basic knowledge for design of structures made from FRP composites.
Teaching Methods
| Teaching methods | Class lectures. Simple examples solved in class. Presentation of selected Case studies. |
|---|---|
| Teaching media | Power-point presentations. Slides. Excel worksheets and calculation codes. |
| Laboratories | Presentation of 2 laboratory tests on FRP materials |
| Computer and software use | EXCEL. |
| Problems - Applications | 3 homeworks per semester |
| Assignments (projects, reports) | Use of EXCEL worksheets. |
Textbooks - Bibliography
- Raftoyiannis Ι., Composite Materials - Mechanical Behavior, Symeon Publ, Athens 2013.
- Gay D., Hoa S., Tsai S., Composite Materials - Design and Applications, CRC Press, New York, 2003.