Table 2 The average value of the test results of each specimen.

Sample

\({\tau _p}\left( {{\text{MPa}}} \right)\)

\({\tau _r}\left( {{\text{MPa}}} \right)\)

\({\delta _p}\left( {{\text{mm}}} \right)\)

\({k_{sp}}\left( {{\text{MPa/mm}}} \right)\)

\({k_{sa}}\left( {{\text{MPa}}} \right)\)