PSI - Issue 71

Shreebanta Kumar Jena et al. / Procedia Structural Integrity 71 (2025) 34–41

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Figure 1. Typical dimensional details of standard (A) tensile test and (B) unnotched solid LCF, (C) unnotched tube (D) Notched tube test specimens machined from primary piping material of IPHWR

Figure 2. Typical tension and torsion machine setup.

2.2. Test setup The test facility comprises a Tension Torsion Machine (TTM) and a biaxial extensometer to control both axial and torsion strain. TTM is a closed-loop servo-hydraulic system consisting of independent axial and torsional actuators, load and torque cells, axial and torsional servo controllers, along with a display unit. The axial and torsional load carrying capacities of this machine are 100 kN and 1000 Nm, respectively. A uniaxial extensometer having an axial travel of +2.2 and – 1.5 mm over a gauge length of 10 mm has been used for conducting tensile and LCF tests on solid specimens. Whereas a biaxial extensometer with axial travel of ±2.5 mm and angular twist of ±2 ° over a gauge length of 25 mm have been used for conducting remote axial strain/angle of twist control tests on unnotched and notched tube specimens. The details of the test setup are shown in Figure 2.