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Failure Analysis

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Paul Okrutny

on 22 September 2011

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Transcript of Failure Analysis

How Things Break Failure Distinct mechanisms exist and can be tracked back to origin and cause. Glass
Fast Fracture
Defective Manufacturing

Excessive Load
Fatigue (loading cycles)

Erosion Failure Fingerprints Study of the microscopic detail of broken or failed surfaces. Fr`yc*tog"ra*phy\, n: Stereo microscope (5X – 200X)
Scanning Electron Microscope (5X – 100,000X)
Energy Dispersive X-ray (Chemical Analysis) Brittle Fracture
Ductile Fracture
Electrical Arcs
Extreme Temperatures Tools of Fractography Source:http://www.tedpella.com/mscope_html/2282.htm Paul Okrutny B. Eng., M. Sc. Glass Fractures Pressurized Bottle
Defective Glass
Damaged Bottle
Excessive Force
Temperature Related Case Studies Fractography Fuel Oil Shutoff Valve Over tightened
Over pressurized
Improperly installed
Accidentally impacted Potential Causes; Possible Explanations Manufacturing Defect Operator Error / Abuse Maintenance Issues Installation Defect Design Defect Material defect Energy-dispersive X-ray spectroscopy (EDX) Ductile Fracture 21 Kpsi 38 Kpsi 77 Kpsi "Relationship Between Mirror Dimensions and Failure Stress for Optical Fibers" Robert J. Castilone, et al. Corning Inc, Corning, NY 14830 Generator Failures Find ALL pieces
Cut out pieces away from fractured area
Do NOT put the fracture surfaces back together
Protect the fracture surface
Have expert remove preferably First on Scene Document area before touching the evidence
Detailed notes
Photography of Everything! Call an Expert Attend site
Over the phone advisement Removal of Evidence Cyclic Loading Glass Fractures Fatigue Failure Overload Failure Fractography 101 GiffinKoerth Forensic Engineering and Science Paul Okrutny B.Eng & Soc, M.Sc, E.I.T Thank You! Pre-Existing Vs. Sudden
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