LSN01 - Introduction Charts

LSN01 - Introduction Charts - ME4123/6123: Failure of...

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Unformatted text preview: ME4123/6123: Failure of Engineering Materials Introductions The Course Your Instructor: Dr. Mark Horstemeyer, Jairus Bernard You Failure Cyclic loading from waves Cyclic thermal loading Ductile to brittle transition Goals & Objectives After this course, students will be able to: Understand how structural components fail Analyze failed components and make recommendations for improvement In order to reach this goal, the following objectives must be satisfied: Analyze structures for the mechanisms of failure Identify and differentiate observable fractographic features Make recommendations to prevent future occurrences of failure. Design and conduct a proper failure analysis investigation. Understand the history, impacts, and ethical implications of failure on society as a whole Write technical reports and memos to communicate clearly What is Failure? Fracture Excessive Yielding Environmental Corrosion UV Attack Atomic Oxygen attack Discoloration Failure to fail IN GENERAL: The inability of a component to to function as intended (usually unexpectedly) What is Failure Analysis? Asking Questions What caused the failure? Poor initial design - Hartford Civic Center Inadequate design information A-10 quadrupled # of high-G turns versus designed-for case Change in use - B-52s from high- to low-level mission Failure to manufacture according to design - KC Hilton Failure to maintain properly TN ANG C-141 How many affected? Can it be tolerated until repair? How can we fix it? WHO IS RESPONSIBLE? Doing Analysis Observing Simulation Sometimes Just Doing Nothing! How Material Breaks? Ductile vs. brittle fracture Principles of fracture mechanics Stress concentration Impact fracture testing Fatigue (cyclic stresses) Cyclic stresses, the SN curve Crack initiation and propagation...
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This note was uploaded on 09/08/2011 for the course MECHANICAL 4123 taught by Professor Horstemeyer during the Fall '10 term at Mississippi State.

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LSN01 - Introduction Charts - ME4123/6123: Failure of...

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