ATA engineers are experienced in nearly every type of structural or mechanical analysis for highly stressed structures: strength and buckling; fatigue and fracture; composite and metallic; linear and nonlinear. Our constant objective is to provide a cost-effective solution for our customers without comprising quality and accuracy. This is accomplished through the use of both advanced finite element analysis (FEA) and traditional handbook methods.
Linear Stress Analysis
ATA’s engineers have extensive experience predicting stresses in both metallic and composite structures. The stresses are often compared to yield or ultimate material strength values in order to demonstrate compliance with required margins of safety or factors of safety. Analyses of composite structures can get very detailed and include predictions of ply, interlaminar, and transverse stresses. For bolted structures, ATA is experienced in evaluating fastener loads, tear-out loads, pull-out loads, and bearing loads. In many instances, stress analysis results are the foundation for further specialized analyses, such as fatigue and fracture.
Fatigue and Fracture Analysis
When a structure is subjected to varying load over a period of time, the fatigue life or damage tolerance is a concern. ATA staff have expertise in the application and interpretation of fatigue requirements for metallic welded structures subjected to cyclic loading, such as theme park rides. Some of the fatigue standards that ATA has extensive experience in applying are:
- DIN 15018
- Eurocode 3 Part 1-9
- Fatigue, AISC Steel Construction Design Manual
- Fatigue, Aluminum Design Manual
- BS 7608
We evaluate structural endurance using CAE methods, as well as traditional design specification methods. ATA performs fracture mechanics based damage tolerance analyses for metallic aerospace structures using NASGRO.
Nonlinear geometric and material effects can also be considered in a structural analysis. For example, ATA can perform analyses that include the effects of material creep, surface contact, large displacements, or multi-body dynamics. Manufacturing processes such as rolling and forming can also be simulated using nonlinear analysis.
Optimized structures provide significant benefits including low material cost and maximum system performance. ATA performs structural optimization to minimize structural weight subject to frequency, displacement, and stress constraints. ATA can also advise on design and manufacturing approaches to further optimize performance and manufacturability.