1. Forging new generations of engineers

2. Factors of Design and Safety

3. Factors in Design Complexity of stress analysis Consequences of failure Environmental exposure Material Strength Potential Misuse of the Product

4. Factors in Design (continued) Quality Control Size or Mass Effect Stress Concentration Factors Types of Loads Type of Material Cost

5. Factor of Safety Used by engineers to account for uncertainty in applied forces, material properties, model assumptions, etc. The allowable stress in the part is determined by the following formula. An acceptable design is when the calculated stresses in the part are less than the allowable stress. Allowable Stress = Material Strength Factor of Safety

6. Multiplier for Factor of Safety Ductile MaterialsBrittle Materials Type of loadYield Strength Ultimate Strength Static2-6 Repeated-810 Impact-1215