PSI - Issue 38

Hubert Blondet et al. / Procedia Structural Integrity 38 (2022) 526–537 Hubert Blondet, Kamilia Barthoux/ Structural Integrity Procedia 00 (2021) 000 – 000

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2.2 Target simulations to take into account Several engine speed / engine load load cases must be computed, in order to have a good correlation matrix, as one can see on the following graph, where red points are the real duty cycle points, and greenstars are an example of the target-computed pairs:

Duty Cycle example

Engine Speed (RPM)

Relative engine load (%)

Figure 5: Global Process – Thermomechanical Simulations – Pairs to simulate

NB: note that, if not all those pairs are simulated, a correspondence between pairs will have to be made, with hypotheses based on thermal states and PCP pressure.

2.3 Compute Unitary Stresses For each simulated load case, a routine is launched to get unitary stresses in every point of the mesh: then an adimensionned stress of +/-1 being when the stress reaches the Rm. The stresses are called Adimensionned Stresses or  adim. The routine also separates thermal stresses from PCP stresses, because of different treatment when computing the participation of each load case (see next paragraph).Process of the routine is described here:

Figure 6: Global Process – Thermomechanical Simulations – Unitary Stress