Abstract
1. Tests to destruction were performed on three batches of specimens made of porous iron sintered in hydrogen at 1423‡ K for 2 h; each batch contained 50 specimens. 2. By means of statistical treatment of the experimental results, we constructed distribution histograms for the strength, and also determined the empirical characteristics of the strength distribution parameters. The experimental results were compared with three distribution laws. 3. Comparisons of the coefficients of variation of samples of strength and porosity determinations showed that the scatter of the strengths cannot be due to random scatter of porosity or to experimental error, but is mainly governed by the probability that the weakest cross section of the specimen shall occur in the working part. 4. We drew the graph of the strength corresponding to 98.2% reliability versus the porosity: it was found that this strength is well below the values given in the literature for the mean strength.
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