SEDL / STP / STP1134-EB / STP19583S

The Breaking Load Method: Results and Statistical Modification from the ASTM Interlaboratory Test Program

Colvin, EL
Technical supervisor and staff statistical scientist, Alcoa Laboratories, Alcoa Center, PA

Emptage, MR
Technical supervisor and staff statistical scientist, Alcoa Laboratories, Alcoa Center, PA

Pages: 19    Published: Jan 1992

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Abstract

The breaking load test provides quantitative stress corrosion cracking data by determining the residual strength of tension specimens that have been exposed to corrosive environments. Eight laboratories have participated in a cooperative test program under the auspices of ASTM Committee G-1 to evaluate the new test method. All eight laboratories were able to distinguish between three tempers of aluminum alloy 7075. The statistical analysis procedures that were used in the test program do not work well in all situations. An alternative procedure using Box-Cox transformations shows a great deal of promise. An ASTM standard method has been drafted which incorporates the Box-Cox procedure.