Image Gallery
End of fractured eyebolt and associated hardware.
Whole bolt and associated hardware.
Chemical analyses of whole and fracture bolt.
Microstructure of fracture bolt. (Transverse view, 200X)
Microstructure of whole bolt. (100X)
Overall view of fracture surface of failed bolt.
Scanning electron micrograph of typical region of fracture surface. (320X)
Scanning electron micrograph showing cracks at thread roots in failed bolt. (200X)
Results of tensile test on sample from whole bolt.
Reading
Russell, Ken. “Report on Fractured Eyebolt.” (PDF)
Assignments
Please prepare a short presentation on the Misplaced Trust case and evidence.
Please prepare a short presentation on Scanning Electron Microscopy.
Please prepare a short presentation on steel (not stainless) and what defines it (chemically and physically). Pay particular attention to the failure of steel (what kind of failures should occur?).
Further Reading
“Calamities” column: ‘The Case of the Misplaced Trust.’ Design News.
