According to “Evaluating Fract

According to “Evaluating Fracture Behavior of Brittle Polymeric Materials Using an IASCB Specimen” (J. of Engr. Manuf., 2013: 133–140), researchers have recently proposed an improved test for the investigation of fracture toughness of brittle polymeric materials. The authors applied this new fracture test to the brittle polymer polymethylmethacrylate (PMMA), more popularly known as Plexiglas, which is widely used in commercial products.

The test was performed by applying asymmetric three-point bending loads on PMMA specimens and varied the location of one of the three loading points to determine its effect on fracture load. In one experiment, three loading point locations based on different distances (mm) from the center of the specimen’s base were selected, resulting in the following fracture load data (kN):

a. Use your calculator to confirm Minitab’s computations.

b. At a significance level of .01, can you conclude there is a difference among true average fracture loads for the three loading point locations?

c. Returning to the Minitab output, note that the number reported under P corresponds to the P-value. Is the P-value exactly zero? What does it mean when Minitab reports 0.000?

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