Experimental Stress Analysis or Strain Gauging
Strain gauges are applied to the surface of the item to be assessed for strength. The strain gauges allow small displacements of the surface of the object to be measured. These small displacements are called micro-strain. The micro-strain can be translated to values of stress using mathematics and the known physical properties of the material of composition when the item is placed under load.
Strain gauges can be used to experimentally determine the deformation of a physical part. A commonly used type of strain gauge is a thin flat resistor that is affixed to the surface of a part, and which measures the strain in a given direction. From the measurement of strain on a surface in three directions, the stress state in the part can be calculated
Strain gauge stress verification is commonly done during design verification load testing of overhead equipment.
We would be happy to assist you in determining the accuracy of your stress analysis (calculations) on your equipment.
Finite Element Analysis
A three dimensional computer model is generated of the item. The item is then descritized or divided up into parts which are usually tetrahedrons or cubes. We know how to calculate the displacement under load for tetrahedrons and cubes so by modeling a complex part by using simple parts we can calculate the resulting stress by knowing the total displacement and material properties of the item
Johansson Engineering Ltd
#9 16728 115St NW