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This is the final highway accident report (NTSB-HAR-71-1) from the National Transportation Safety Board, adopted in December 1970. It covers the collapse of the U.S. 35 bridge between Point Pleasant, West Virginia, and Kanauga, Ohio, on December 15, 1967, which killed 46 people. The Board found that the cause was a cleavage fracture in eyebar 330 at joint C13N. That fracture grew from a flaw produced over 40 years by stress corrosion and corrosion fatigue, in a spot that could not be seen or found by inspection.
“R.G.”1 page
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TABLE 1 ## Summary of Fracture Toughness Data Point Pleasant Bridge Eyebar Material Type of Specimen Number Test Temperature，°F Critical Stress Intensity Factor，KIC，ksi√in. Range Average Notch bend 2 70 46.50-53.61 50.06 Notch bend 3 0 28.27-35.90 32.39 Surface flaw 3 70 47.90-50.9 50.2 Surface flaw 3 32 43.2-50.8 46.4 Surface flaw 3 0 33.4-41.8 38.0
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