Photoelastic and Strain Gage Stress Analysis Industries Served

Here you can learn about the many Industries Stress-tek is proud to serve with our advanced photoelastic and strain gage stress analysis and evaluation technology.

 Industries Served: Aircraft | Space Exploration | Automotive

 

Aircraft


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Photoelastic Analysis of an Aircraft Landing Gear

Photoelastic material coating the contours of landing gear components. The Landing gears are fabricated from forged and machined high-strength steel. The gear is a complex assembly of parts exposed to as many as six different loading conditions.

Because the landing gear is used only twice during a flight and represents dead weight the remainder of the time, any weight reduction is of great benefit. At the same time, safety is paramount; If the stress distribution is accurately known for all significant modes of loading, safety factors can be well defined and reduced to a minimum.

 

 

 

 

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Strain Gage Stress Analysis of a Turbine Blade Attachment Joint 

High rotation speeds create high stresses in the attachment area on this turbine blade. Strain gages are bonded in predicted critical areas on this turbine blade coupling joint to assess actual strains when the part is put under load. This analysis allows for design modifications of shape and hole tolerances to ensure proper safety margins are developed.

 

 

 

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Strain Gage Stress Analysis of Composite Material

Strain gages are placed on a carbon fiber tensile test specimen to qualify the material for aerospace service. Multiple gages are placed on each specimen to get a broader picture of material performance as the tensile specimens were taken beyond the yield point.

 

 

 

 

 

 

Space Exploration


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Strain Gage Stress Analysis of Components used in a Deep Space Telescope

Very small strain gages are placed in critical areas of a telescope component to verify strains as predicted by theory and FEA. The component is a very thin disk where bucking and torsion play critical roles in how loads transfer from the inner mounting holes to the outer edges of the disk. Guidance of the telescope lens requires high precision and maximum performance characteristics from the controlling components.

 

 

 

 

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Strain Gage Stress Analysis of a Rocket Bellows Retention Component

A prototype retention component that supported a rocket bellows for delivering fuel to the engine is strain gaged in fifty critical locations to determine strains when put under test loads. Rosettes and axial gages resolve principle stress magnitudes and their directions. This assembly is tested under cryogenic conditions.

 

 

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Robotic Satellite Torque Sensor 

Strain gages bonded to high strength alloy element for transmitting actuation torque in spacecraft environment. Cleanliness and non-outgassing materials is a priority for spaceflight applications. Sensor has redundant bridges for maintaining functionality in extreme conditions.

 

 

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Rocket Engine Fuel Delivery Bellows

Strain gages placed on critical sections of rocket bellows for functional tests. Cryogenic test conditions simulating liquid oxygen flow are performed to verify stress levels and safety factors of the design. This is a stainless steel, multilayered bellows with welds in critical locations.

 

 

 

Automotive/Trucking


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Photoelastic Analysis of Fifth Wheel Truck Coupler

The 5th wheel is the only mechanical connection between a tractor and trailer where all vertical and horizontal forces are transferred. Photoelastics was molded to the contours of an actual cast steel part to measure strains under service loads. This photoelastic illustration highlights areas of high stress and allows a designer to make alterations to meet safety factor requirements. This information can also identify critical casting defects if they are found in known high stress areas.

 

 

Photoelastic Stress Analysis of a Heavy Duty Truck Suspension BeamFull screen preview

A fabricated steel truck suspension equalizing beam is coated with a flat sheet of photoelastic material to visualize a stress pattern as it’s loaded. The beam is loaded in bending, pushing down on the right of the illustration and reacting up on the left. The project goal was to find a region on the beam that had “no stress” so an accessory part can be welded in this no stress region. This “no stress” region is highlighted by the dashed rectangular area where there are no color bands.

 

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Strain Gage Stress Analysis of a Load Cell Bending Beam 

This stress analysis locates the inflection point between tensile and compressive bending stresses in a fixed ended beam under complex bending loads. By definition, there is no bending stress at the transition area between the tension and compression stress fields. Once this “no stress” region is determined, a wire feed through hole is drilled without compromising safety factor. This is a highly stressed beam used in the mining industry where stress risers are a big concern.