Proof testing of ceramics

The effectiveness of proof testing as a method of improving component reliability was studied by comparing strength distributions of soda-lime-silica glass before and after proof testing. The effects of unloading rate from the proof stress, hold time at the proof stress, and proof test environment were examined. The results indicate that the proof test must be conducted with rapid unloading rates and good environmental control to be effective. The theoretical implications of these results are discussed.