Basic Composite Repair Training: Lecture A1 Introduction
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This PowerPoint presentation provides an introduction to composite materials. It discusses the history of composites, including early uses in ancient civilizations and advancements during World War 2. It defines composites as materials made of two or more materials combined to produce desired properties. Fiber reinforcements are embedded in a resin matrix. Examples of composite applications include bicycle frames, bridges, and naval vessels. Advantages include design flexibility, strength to weight ratio, corrosion resistance and fatigue resistance. Disadvantages include high costs, difficulty inspecting internal damage, and potential health hazards from thin fibers.
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Basic Composite Repair Training: Lecture A1 Introduction
- 1. Basic Composite Repair Training: Lecture A1 This PowerPoint is only a sample. It contains only a sub portion of the complete presentation*
- 2. L earning outcome By the end of this lecture Trainee will know: 1. Introduction to Composite a) General History b) Definition c) Application of Composites d) Advantages and Disadvantages 2. Composite Materials a) Fiber reinforcements b) Resins c) Handling and storage d) Safety Precautions
- 4. 1a. General History First uses of composite started as early as in the1500s B.C; Adobe bricks.
- 5. Great advancement in composite were incubated by war; World World II World War 2:The Mosquito was a twin engine fast fighter the Mongols invented the first composite bow. Using a bomber, with an airframe that was largely constructed in a combination of wood, bone, and “animal glue,” bows were composite of wood layers and adhesive pressed and wrapped with birch bark
- 6. 1970s, composite industry began to mature
- 7. What is Composite? • Two or more different materials combined together that produce a material with desired properties • Reinforcing phase (Fibers/sheets/particles) embedded in high performance matrix phase • Do not dissolve or merge completely with each other, They act together Reinforcing Resin Composite Fiber Resin and reinforcment do not dissolve together like sugar and water
- 8. Application of Composites Lance Armstrong’s 2-lb. Trek bike, 2004 Tour de France Pedestrian bridge in Denmark, 130 feet long (1997) Swedish Navy, Stealth (2005) Ken Youssefi Mechanical Engineering Dept. 8
- 9. Advantages of Composites 1.Design flexibility 3.High strength to weight ratio 4.Fatigue Resistance Replacing multiple parts with just one part Composite is know for high fatigue resistance 2.Corrosion resistance Composite is know for high corrosion resistance
- 10. Disadvantages of Composites 1.High cost 3.Difficult to determine integrity of repair Expensive materials and machines Unable to check the quality of repair 2.Difficult to inspect 4.Potential health hazards Internal composite damage maybe hidden Extremely thin fibers may cause potential health hazards
- 11. SAMPLE ONLY This PowerPoint is only a sample. It contains only a sub portion of the complete presentation*
Editor's Notes
- Welcome to the first lecture of your basic composite repair training course.
- In this lecture, the first two topics; introduction to composite and composite materials will be covered. In any of any doubt, please not hesitate to email your question to your instructor
- Welcome
- The use of composite is not a new idea. The first uses of composites date back to the 1500s B.C. when early Egyptians and Mesopotamian settlers used a mixture of mud and straw to create strong and durable buildings.
- Many of the greatest advancements in composites were incubated by war. Just as the Mongols developed the composite bow, World War II brought the composite industry from the laboratory into actual production. One example the Mosquito fast fighter used in War world 2.
- In the 1970s the composites industry began to mature. Better plastic resins and improved reinforcing fibers were developed. Application of composite materials in the aviation industry is increasing in a significant rate.
- What is composite? Composite is something made from two or more components; in our case here a fiber and a resin. Taking the adobe bricks for example, the reinforcing fibers are the straws, and the resins are the mud. When combined, the straws provide strength with the toughest of the mud. The reinforcement and resin do not dissolve or merge completely with each other, They act together. Composite is something made from two or more different materials combined together that produce a material with desired properties.
- Other than the huge application on the aviation industry, as shown in the earlier slightly, composite materials are used in many other areas.
- The advantages of composites. Composites have high design flexibility. They can be molded into complicated shapes more easily than most other materials. This gives designers the freedom to create almost any shape or form. Most recreational boats today, for example, are built from fiberglass composites because these materials can easily be molded into complex shapes, which improve boat design while lowering costs. The surface of composites can also be molded to mimic any surface finish or texture, from smooth to pebbly. Composites resist damage from the weather and from harsh chemicals that can eat away at other materials. They stand up to severe weather and wide changes in temperature. Strength-to-weight ratio is a material’s strength in relation to how much it weighs. Some materials are very strong and heavy, such as steel. Other materials can be strong and light, such as bamboo poles. Composite materials can be designed to be both strong and light. This property is why composites are used to build airplanes—which need a very high strength material at the lowest possible weight. A composite can be made to resist bending in one direction, for example. When something is built with metal, and greater strength is needed in one direction, the material usually must be made thicker, which adds weight. Composites can be strong without being heavy. Composites have the highest strength-to-weight ratios in structures today. Composites also show excellent fatigue resistance when compared with most metals. However, since fatigue failure tends to result from the gradual accumulation of small amounts of damage, the fatigue behaviour of any composite will be influenced by the toughness of the resin.
- Although composite materials have certain advantages over conventional materials, composites also have some disadvantages. Composite involved expensive materials, machines and setup of workshop. Visual inspection on composite is also difficult. Internal damage maybe left hidden before the scheduled inspection. Quality of composite depends on the skills of the maintenance crew, it is difficult to determine the integrity of repair. Composite material may result in health hazards. Composite material consists of extremely thin fibers. Safety vest, glasses and gloves must be wore to protect yourself
- The disadvantage of composites.