1. Consultancy
  2. Aerospace

Aerospace

Expertise in the aerospace sector has been gained through a range of software development, R&D and consultancy projects.

Jet engine

Zentech has expertise in the aerospace sector in both engine and airframe applications. Historically the work has usually involved metallic components and the simulation of crack growth in those components. For engine applications, high temperature effects contribute to the difficulty of such simulations.

The increasing use of composite materials in the aerospace industry, both in defence and civil sectors, has remained mainly in low stress regions to prevent any delamination present from propagating further and affecting operating safety. It is now possible [1-3] to evaluate growth of small cracks (i.e. sub mm initial defects) using the modified Hartman-Schijve crack growth law, which is based on the NASGROW equation. Implemented as a standard option in Zencrack, the Hartman-Schijve crack growth law can assess durability and damage tolerance (DADT) of small cracks due to naturally occurring discontinuities. Application areas include additive manufacturing, corrosion, surface pitting and adhesive lap joints.

Project work includes:

  • a range of finite element analysis projects from internal engine components and casings to landing gear
  • development of Zencrack software arising from initial consultancy work to develop stand-alone routines for crack simulation
  • development of high-temperature thermo-mechanical solutions for combined fatigue and time dependent crack growth simulation
  • investigation of the influence of cracks in additive manufactured components and adhesive repairs
  • investigation of crack growth from the root of surface pits

Consultancy work in this area involving crack simulation is supported by our proprietary Zencrack software.

References

1. Application of the Hartman–Schijve equation to represent Mode I and Mode II fatigue delamination growth in composites
R. Jones, S. Pitt, A.J. Bunner, D. Hui
Composite Structures, 2012, 94, 1343-1351
https://doi.org/10.1016/j.compstruct.2011.11.030

2. Fatigue crack growth and damage tolerance
R. Jones
Fatigue & Fracture of Engineering Materials & Structures, 2014, 37, 363-483
https://doi.org/10.1111/ffe.12155

3. On Cyclic-Fatigue Crack Growth in Carbon-Fibre-Reinforced Epoxy-Polymer Composites
Silvain Michel, Neal Murphy, Anthony J. Kinloch, Rhys Jones
Polymers, 2024, 16, 435.
https://dx.doi.org/10.3390/polym16030435