Stress & Strain Analysis


Our key engineering staff members have worked with complex stress analysis problems dating back to 1981.   We have the breadth of training and real world experience to determine which analysis technique is most economical for what the Client wants to accomplish.  We can present technique options, costs, and recommendations immediately after hearing about a particular stress analysis problem needing work.  (Incidentally, all estimates are free of charge.)  Our approach to solving a stress & strain problem can include one or more of the techniques below:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Finite Element Analysis (FEA)         

Practically anyone with a CAD program and a computer can operate the stress analysis packages available today.  But does the Client get an answer to be counted on?  Perhaps, or perhaps not.  It depends very directly on the operator who is determining how the load is applied to the part, the mesh on the part, the boundary conditions, element types, symmetries, and attachment types.  Experience is required to make these judgments correctly. 

FEA is by far the most common form of numerical stress analysis performed today.  We utilize ProEngineer’s Mechanica for complete 3-dimensional numerical computation of deflection, stress and strain.  

 

 

 

 

 

 

 

 

Classical Derived Solutions                     

On most occasions, the more simple problems do not need an over-blown approach to get to a quality solution.  The basic techniques of the field of solid mechanics work as well today as they did 50 years ago.  They often produce results with errors that are less than numerical computational methods.  98% accuracy is not uncommon at all.  This is often sufficient, and we stop there.  The problem gets solved quickly and inexpensively.  We have maintained our "edge" regarding the classical methods approach over the years and enjoy applying these when appropriate.   

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Experimental Stress Analysis                       

For problems that are rather complicated and have hardware available, we can often simply instrument the actual part and subject it to all types of loading right in the laboratory.  This is a very direct, economical approach and always succeeds in conveying the integrity of the new design to management and others.   We can also create the physical model to test right in our prototype machine shop, if needed.

Instrumentation options include strain gages, deflection gages, and photoelasticity.  Each has its own strengths and each is inexpensive to apply. 

Strain gages are bonded on resistive elements that are already calibrated to give strain values after wiring up.  They give complete information on the strain field at a specific location.  We can also measure residual stress and strain using strain gages.

Deflection gages are for overall deflection data.  These can be individual dials or transducers wired right into our data acquisition system. 

Photoelasticity is fascinating to observe and provides a “full-field” solution, enabling the engineer to have a quantitative map of the entire stress field for the part in question.  This is very powerful, especially for new parts, or for old part being loaded in new ways.


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