Stress Analysis

TLG Stress Analysis Services:

  • Structures DER, Ian Draycott
  • Metallic and Composite Analysis and Design
  • Static, Fatigue and Damage Tolerance Analysis
  • Bird Strike and Rotor Burst Impact Simulation
  • Continued Airworthiness Documentation
  • Support In-service Major Repairs and Alterations
  • Ground Test Planning, Support and Analysis
  • Industry Standard Analysis Tools
  • Finite Element Analysis Experience Includes:
    • Linear Static
    • Modal and Frequency Response
    • Buckling
    • Implicit and Explicit Nonlinear
    • Optimization
    • Thermal
    • Validated by Test or Classical Methods


TLG employs a variety of classical methods and numerical simulation tools to analyze and size structural components. When it is deemed beneficial to build a Finite Element Model, TLG’s meshing tools are the recently released and industry leading MSC Apex™, MSC PATRAN, Star CCM+. TLG can run a full range of simulations, including: Linear Static, Modal, Buckling, Frequency Response, Thermal, Implicit and Explicit Nonlinear. TLG employs large computing clusters to support time intensive simulations and analysis. TLG’s ability to support multiple parallel solutions is another capability that is available to alleviate bottlenecks on customer projects and preserve program schedules.

It takes much more than a FEM to assure aircraft components meet requirements. Primary structure may require Fatigue and Damage Tolerance (F&DT) analysis. Addressing criteria such as Failsafe or Safe-life early in the development cycle can significantly alter the test and certification approach. The influence of installed systems on the surrounding structure and critical flight controls surfaces need to be acknowledge and accounted for, like rotor burst and small fragment damage. Critical crack growth lengths needs to be calculated to achieve desired maintenance intervals. TLG staff are experienced with both the F&DT analysis tools and continued airworthiness documents that category 23 and 25 aircraft require.

In additional to analyzing primary and secondary aircraft structure, TLG has recently completed and currently support many aerospace related tooling programs. These span from thermal and stress analysis of high pressure Resin Transfer Molds (TRM), transitional autoclave and oven thermal cycle analysis, to specialized large scale aircraft shipping fixtures used to transport whole fuselage and wing assemblies by air. TLG understands that many of these tools do not require the fidelity of certified airframe component and that many of these jobs require a very quick completion schedule.

Documentation and validation of analysis is important and necessary, particularly when certification by a Regulatory Authority is sought. To this end, TLG has developed stress analysis templates that can be used to generate Certification level Reports. TLG can provide support for test instrumentation definition and test plan creation and review when validation of the structure is required. TLG can fully support the common axiom: Certification by analysis, validate by test.

The TLG Stress team is prepared to work with the Customer to generate an analysis plan that will assure a program is successful.