Introduction to Engineering Materials ET 241 Spring 2016 Southeastern Louisiana University Instructor:Junkun Ma Office:Fayard Hall 329C Phone:(985)

Definition: “Materials are substances used as inputs for production and manufacturing” -- Wikipedia Category according to materials form: Raw materials: those obtained from nature Semi-finished materials: materials obtained from processing raw materials Final products: those can be used directly in different applications What are Materials?

Periodic Table

Safety / Reliability Durability Availability Cost Appearance Environment Importance of Materials?

Definition: “Materials science or Materials Engineering is an interdisciplinary field involving the properties of matter and its applications to various areas of science and engineering” -- Wikipedia A science study relationship between structure and properties of materials. Applied Physics Chemistry Mechanical Engineering Civil Engineering Electrical Engineering Nano-technology in recent years What is Material Science & Engineering?

History of Human Usage of Materials Usage of natural materials such as sharp stones Usage of man made materials such as stone arrows Discovery of fire Pottery Pure metals: Copper, Silver, Gold and Meteoric Iron Usage of Alloy such as bronze Modern materials Semiconductor Bioimplant materials Industrial ceramics Composites Nano-structured materials Hybrid materials

Importance/Significance of Materials Outstanding achievements Lessons learned What should we do to avoid this? Progress in materials strength-to-density ratio as a function of time

Products Design Process Product design or redesign is initiated as a result of general market demands or trends, customer requests, or new ideas. Factors influence product design: Available technology Consumer preference Demographics Economics Competitions Key to success: Time from concept to production Design methodology Rapid prototyping technology

Materials Selection Properties Mechanical Physical Chemical Costs Processing cost Shipping & storing cost Disposing cost Source Availability Timely delivery Environmental issue EPA regulations Biodegradability Health factor Renewable resources

Standards and Specifications Specifications: Descriptions of technical requirements, including quality, use of materials and manufacturing procedures, of materials, products, or services. Standards: Specifications that have been adopted for use by a group of manufacturers and users. American Society for Testing and Materials (ASTM) National Institute for Standards and Technology (NIST) American National Standards Institute (ANSI) International Organization for Standardization (ISO)

Questions to Ask What areas of study do material science and material engineering span? Why there are so many different materials with different properties available despite the fact that there are only 118 elements on the periodic table? What properties do we need to consider when selecting materials for engineering applications? Why material selection is crucial for engineering applications? Can you give examples? Do you know any industrial/professional associations and standards? If so, what do they do?