SEDL / STP / STP844-EB / STP35239S

Effect of Multiregion Crack Growth on Proof Testing

Wiederhorn, SM
Group leader, ceramic engineer, and physicist, Inorganic Materials Division, National Bureau of Standards, Washington, D.C.,

Freiman, SW
Group leader, ceramic engineer, and physicist, Inorganic Materials Division, National Bureau of Standards, Washington, D.C.,

Fuller, ER
Group leader, ceramic engineer, and physicist, Inorganic Materials Division, National Bureau of Standards, Washington, D.C.,

Richter, H
Senior research scientist, Fraunhofer-Institut fur Werkstoffmechanik, Frieburg,

Pages: 22    Published: Jan 1984

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Abstract

The effect of subcritical crack growth on proof testing testing is examined. Crack velocity curves obtained by fracture mechanics techniques are used to predict theoretical strength distributions for the specimens that survive proof testing. These theoretical distributions are then compared with experimental distributions obtained on soda lime silica glass slides. The comparison reveals a strong sensitivity of the proof test results to the exact position and shape of the crack growth curve. Minor changes in the crack growth curve result in major shifts in position and shape of the strength distribution curves after proof testing. The importance of crack geometry and specimen configuration to crack growth behavior, and hence to the strength distribution, is emphasized.