PSI - Issue 1

H. Soares et al. / Procedia Structural Integrity 1 (2016) 265–272

270

Author name / Structural Integrity Procedia 00 (2016) 000 – 000

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4.3. Tensile test

Table 5 presents the results that are related to the yield strength ( σ e ), endurance limit ( σ máx ), percentage elongation (A p ) and percentage reduction in area ( φ ), for the railway wheels conformed with class B material, in the environment temperature in the rim area and wheel disk. According to the previously illustrated Figure 3, the tensile specimens of the rim were removed from the region that is directly affected by thermal treatment, thus justifying the increase of mechanical strength values and reduced ductility. The results are compatible to the hardness values previously presented. Figure 6 presents the tensile testing result and Stress (MPa) versus Displacement (mm) chart, respectively.

Table 5. Tensile Testing Results

Zone Rim Disk

σ e (Mpa)

σ max (MPa)

Ap(%)

ϕ (%)

733.1 429.7

1103.6

12.76 12.56

29.83 23.66

876.8

Figure 6. Tensile testing result - (A) Rim and (B) Wheel Disk Stress (MPa) versus Displacement (mm)

4.4. Impact test

The impact testing results of the class B material are presented in the Table 6.

Table 6. Impact testing results - specimens A, B and C.

Impact Charpy - Joule (J) A 13J B 12J C 15J