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Stress & Structural Analysis Services

Contact DTB for reliable stress and structural analysis.

Testing & data acquisition at DTB Test Center

Structural analysis can determine cause and predict failure. Data is collected during complete structure and/or component testing, including simplified tensile strength tests.

Design Simulation

Using Finite Element Analysis (FEA) techniques, our structural analysis engineers will help to dramatically reduce development time, while accelerating the design process.

Modeling through Autodesk Inventor and FEA using ANSYS, our experienced engineers and structural analysts will verify findings against empirical test data, simplified models, and classical calculations to ensure accuracy.

Our expert test engineers will verify findings in simulated settings in our laboratories to ensure product compliance. Validation and correlation of simulation with actual experimental measurements are made by using displacements from string pods and load measurements from load cells.

The FEA simulation capabilities include but are not limited to the following:

  • Static Analysis that includes – Linear/Non-linear Analysis, Failure Analysis, and Component Life Prediction
  • Dynamic Analysis that includes Modal Analysis, Forced Response, Random Vibration, Shock and Rotor Dynamics

In addition our experienced design team can provide services in the field of conceptual design, 3D solid modeling, assembly modeling and detailing and drafting for both onsite and offsite development.

Damage Tolerance Analysis

Damage Tolerance Analysis — DTB has conducted significant structural test and analysis programs that involve damage tolerance principles and design. Crack growth coupon tests are used to determine the effect of loading frequency and environment on crack growth parameters.

For example, we can measure the crack growth rate of arresting gear during life extension tests. Then we would correlate the actual test results to analytical predictions of damage tolerance. This kind of hybrid testing and engineering work is a DTB hallmark.

DTB utilizes AFGROW and other software packages for analysis of structures for crack growth life. In conjunction with our stress analysis programs, we have experience in conducting damage tolerance analysis on aircraft antenna installations and equipment modifications.

Structural Analysis

Reliable analysis for structures and components

Structural analysis is important because it can evaluate whether a specific structural design will be able to withstand external and internal stresses and forces expected for the design. Dayton T. Brown has a proven track record in structural analysis, testing and simulation. In many structural tests, subjects are strain gauged and calibrated.

Structural analysis is performed and in some cases correlated with the testing output data. This produces an electronic virtual working model for future design development.

Analysis and Testing Capabilities
  • DTB-9641-SpoilerDevelopment of engineering solutions through analytical calculations from fundamental principles and the subsequent preparation of technical reports with strength and stiffness analysis, margin of design safety of engineering test articles, structures and components, validation of design versus actual for Shear, Moments and Torsion requirements.
  • Development of load paths and determination of buckling loads, limit/ultimate loads, or creep on parts at room or elevated temperature. Load cells are used to apply forces to components under simulated operating conditions, and the results are used to validate designs and other analyses.
  • Through use of strain gauges, load calibrations, data recording equipment and other instrumentation, the loading history is recorded. By using statistical methods, a loading spectrum can be determined that expands the recorded data into the full range of conditions. This information can be used in analytical life predictions and for discrete tests.
  • Complete structural analysis capabilities, including linear and non-linear analysis of frame and structural systems under static and dynamic loadings and analysis of structures in steel and reinforced or unreinforced concrete and composite structures.
  • DTB can also provide structural analysis services for the evaluation and condition assessment of existing structures, including application of nondestructive, in situ, and load-testing methods for measuring existing states of stress, material properties, structural behavior characteristics, and material uniformity.
Failure Prediction

PG-ENG-fatigue-01Failure Prediction — Using strain life methods, stress life or load life methods, we can analyze your product, develop a loading spectrum and make fatigue life predictions for your system.The strain information can come from test data or from finite element modeling.We can support field strain gauges and load measurements to provide data for these analyses.

Vibration Analysis for Predictive Maintenance

Our vibration analyists can determine stress points in your equipment and structures and, through analysis, can predict failures and recommend preventive measures and design improvements as required.

DTB’s Finite Element Analysis (FEA) method is used to model the structural dynamic characteristics of vibrations within a mechanical system, the understanding of which is important to any root-cause failure study involving excessive vibrations. Of significance is the use of vibration analysis and FEA techniques to evaluate the dynamic characteristics of machines and structures prior to fabrication.

  • Finite Element Analysis techniques can also model the response of your equipment or structure to dynamic loads.
  • Finite Element Analysis models simulated are used to approximate stress stiffening effects in rotating mechanical components.
  • The FEA analysis models are used to approximate the natural frequencies and mode shapes of complex structural-mechanical systems.
  • DTB’s vibratory testing facilities simulate vibration and shock response from a shaker table on a structural component.

Our experts reduce testing time by performing vibration analysis on complex systems.

Example: DTB runs quick simulations. Reliable analysis can be performed to fit within tight production and qualification schedules. Our technicians and experts are very experienced, our facilities are thoroughly equipped and we understand business.

We take pride in our ability to develop models that are only as complex as necessary to resolve the problem in a timely manner.

Stress Analysis Services

Parts – Assemblies – Structures

Our staff of stress analysts can help you. By using methods appropriate for your systems requirements, we can design, verify or diagnose structural issues and design a repair.

In fact, we have performed successful stress analysis on aerospace components and aircraft modifications by using both finite element stress analysis and classical hand analysis. Examples of our stress analysis experience include efforts to predict the fatigue life and damage tolerance capability of existing and redesigned arresting gear truss assemblies for carrier aircraft.

The purpose of this stress analysis program was to extend the life of existing arresting gear by analysis and testing of the gear to realistic loadings. We developed a realistic loading spectrum based on flight test data for the analysis and test.

By using strain life fatigue predictions methods, we predicted the fatigue life and damage tolerance of the assembly, and compared to the test data with excellent results.

Our experts have also conduct structural analysis of electrical equipment for seismic requirements using the latest building code seismic requirements. We also can help you with static, strength,fatigue life, damage tolerance calculations. And, our staff of stress analysts can prepare for you strength certification reports.

To provide you with an efficient and accurate stress analysis we apply finite element stress analysis and classical hand analysis as follows:

  • A free body diagram of the item should be prepared showing all applied loads and reactions.
  • Calculate the magnitude of the reactions based on static equilibrium or using redundant structure analysis methods such as FEA
  • Calculate internal stresses using sections cuts through the item or using finite element analysis.
  • Calculate allowable stresses based on all possible failure modes including
    • Material yield stress
    • Material Ultimate stress
    • Material fatigue allowable based on the load spectrum
    • Buckling or crippling stress allowable for compressive loads