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Fatigue Analysis

Fatigue Analysis is a big part of what our consultants do at our Singapore offices in BroadTech Engineering.

Featured Fatigue Analysis Case Studies

Fatigue Analysis

Oil Tank Mounting System for A320 Neo Block 2 Design

Objective: Perform design validation of Oil Tank Mounting system for A320Neo Block 2 design.
Methodology/Approach: FEM Model with Oil tank and Mounts is built in Ansys 12.1 with 3D Tetra elements Solid 95. Nonlinear material properties are used for respective components. Large displacement and Nonlinear geometry options are activated.Oil mass inside oil tank is simulated by adjusting the density of material property. Accessories are connected by using RBE3 elements.Mounts are fully constrained at each bolt hole related to engine fan case. Spherical joints are simulated by using spring elements in 6 directions. This assembly has been analyzed for the below load cases.
1. Proof Pressure – 18 psig
2. Burst Pressure – 30 psig
3. Design pressure – 40 psig
4. LCF
5. HCF
6. FBO
7. Modal Analysis
Conclusion: The oil tank assembly has been analyzed for all the load cases and observed that Assembly had a safety factor of 1.2 to UTS for Design pressure case, SF to Total strain is 2.4, Cumulative life calculate for LCF @ 100 cycles, LCF @ 50000 cycles is 0.009 which is less than 1.

Structural Redesign of Mount

Objective: Requirement is all the mounts should have natural frequencies over 70 Hz. It is observed that bottom mount has a natural frequency of 73 Hz. Hence a redesign has been performed on the mount.
Methodology:
The first mode is observed at 73 Hz in the mount, Hence the change in structure design by adding stiffeners to the bracket has been proposed by considering without a change in overall mass also without a change in interfaces.
FEM Model with Mounts is built in Ansys 12.1 with 3D Hexa elements Solid 45. Modal analysis has been performed and normalized stress and displacements for each mode considered and alternating stress are calculated using mode shape scaling technique. Average stress is calculated from static analysis through which Goodman-Smith diagram is plotted.
Conclusion:
The first mode has been raised up to 81 Hz with a new design. Which resulted in an increase of reserve factor by reducing max stress from 26.7 to 23 MPa.

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Discover what FEM Fatigue Analysis can do for your company now by calling us (to schedule a free demo). Simply call to contact us today at +6581822236 for a no obligation discussion of your needs. if you have any queries, our knowledgeable and friendly representative will be happy to answer any of your questions and share with you in details the benefits & features of a preemptive fatigue analysis. Alternatively, for quote request, simply email us your technical specifications & requirements to info@broadtechengineering.com