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Ch 1 Crystals-4 - MatE 25 San Jose State University Lab...

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MatE 25 San Jose State University Lab Notes Rev 4.1 1 - 1 Crystals 1 Crystal Structures Introduction Overview to Labs 1 to 3 These first three labs explore crystal structures, orientations within those structures as well as the effects of external forces upon those structures. We will start with the bonding between atoms, and how those bonds create different crystal structures, which when combined, form lattices. We will observe and identify parallel planes within the lattice. We will observe some of the structures in both models and samples. We will discuss and observe the types of defects and their effects on the lattice. Then we will apply external forces to crystalline materials until failure, as well as measure the same material failure parameters under varying conditions. In addition, we will discuss real world applications of mechanical failure as it applies to the crystalline properties and structures. After the three week lab session, you should have a comprehensive understanding of how the crystal structure and defects in a material contribute to its mechanical properties. Crystal structure will be a recurring theme throughout the rest of this semester in the lab. You will see that crystalline structure plays a role in a large range of materials applications: metals, semiconductors, ceramics, and polymers. 1.0 Writing Assignment - Engineering Memo 1.1 Your Job Assignment The company you work for, Marine Research Corporation, makes various oceanographic research platforms, and is eager to enter the business of building platforms for long-term continuous study of climate effects in arctic regions. You are a materials engineer in the materials testing labs, working on materials development and quality control. A new type of platform that can withstand arctic storms as well as having the ocean freeze up around the platform has been designed. The design team is considering using 1018 steel as the platform structural material. You are asked to prepare a brief engineering memo for your boss, with the purpose of providing information about 1018 steel, and determine if it is a good design selection for this application. You need to describe the crystal structure and defects in steel. Include a description of the slip planes and slip directions. Compare the mechanical properties of the 1018 steel with those of other metals. Evaluate whether it will be a good choice for the research platform in Arctic Ocean environment. 1.2 The Audience Your manager, Ms. Irene Huang, has a bachelor’s degree in Mechanical Engineering and an MBA. She is motivated to enter this new market but knows how important safety is, and how important proper material selection is when starting out on a new design. Assume Irene is familiar with general mechanical engineering concepts, but is not familiar with specific material properties of 1018 steel such as strength, toughness, slip planes, and properties that have temperature dependence.
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  • Spring '08
  • RayChen
  • Cubic crystal system, Diamond cubic, Crystal system, Atomic packing factor, San José State, José State University

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