MAT_SCI_104_final_review_1

MAT_SCI_104_final_review_1 - DEFINITIONS 1) Fatigue-...

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DEFINITIONS 1) Fatigue- Failure, at relatively low stress levels, of structures that are subjected to fluctuating and cyclic stresses. 2) Creep- The time-dependent permanent deformation that occurs under stress; for most materials it is important only at elevated temperatures. 3) Fatigue limit- For fatigue, the maximum stress amplitude level below which a material can endure an essentially infinite number of stress cycles and not fail. SHORT QUESTIONS FAST ~ The greater the difference in electronnegativity between two elements, the more ____ the bond between the. IONIC ~ What is the direction of the Burgers vector for an edge dislocation? Perpendicular to the dislocation line. ~ What is the coordination number for a BCC crystal structure? 8 ~ The coordination number for the HCP crystal structure is? 12 ~ What is the coordination number of Ti in BaTi03 perovskite structure? 6 ~ What is the coordination number of AX-structure e structure? 6 ~ What is the coordination number of Celsium Chloride structure? 8 ~ What is the coordination number of Zinc Blende structure? 4 ~ What is the coordination number of A m X p -structure? 8 ~ Name the factors that affect fatigue life. Mean stress level, geometrical design, surface effects, metallurgical variable, and environment. ~ Draw me a design factor that affects fatigue. Pg. 235 ~ What are two environmental effects. Thermal and corrosion ~ What are the three forms of iron. Ferrite, austenite and cementite ~ What am I describing; the phase exist as lamellae that alternate with one another. Eutectic structure SLOW ~ During glass smashing experiment it was more difficult to break tempered glass because? Tempered glass had compressive surface stresses
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MAT_SCI_104_final_review_1 - DEFINITIONS 1) Fatigue-...

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