PSI - Issue 71

Anoop Kumar A. et al. / Procedia Structural Integrity 71 (2025) 287–294

289

Table 1: Mechanical properties of materials Material Temperature, K

Young’s Modulus, N/mm 2

Yield strength, N/mm 2

Ultimate strength, N/mm 2

Nickel alloy

293

206,010

549

932

973

186,390

490

834

293

181,485

980

1177

High strength steel (HSS)

773

149,112

638

785

Copper alloy

293

140,675

240

367

723

120,763

105

177

923

106,914

75

94

1023

99,850

57

60

293

184,000

196

539

Stainless steel (SS)

673

152,055

106

368

1,253

74,000

30

100

Kinematic hardening material models based on the stress-strain curves from tests are used to simulate the elasto-plastic response of the materials.

4.

Results of analysis

4.1. Stress analysis of injector head assembly for acceptance / proof pressure condition The acceptance test or proof pressure test involves pressurizing the mixing head assembly to a pressure higher than the maximum design pressure at ambient temperature with the help of specially designed test fixtures. The schematic diagram of proof test configuration of the injector head assembly is shown in Fig. 2. Considering the symmetry of geometry and loads, 180 0 model is used for analysis.

Fig. 2. Proof pressure test configuration of injector head assembly

Finite element model of the injector head assembly for proof pressure simulation is given in Fig. 3. (a). Fig. 3. (b) shows the proof pressure with boundary conditions. One end of the model is provided with axial (UZ) and tangential (UY) restraints with respect to the cylindrical coordinate system. Also, one node is restrained in the lateral (UY) direction with respect to the global Cartesian coordinate system. Inlet side is provided with equivalent pull pressure to simulate the meridional loads due to internal pressure.