Deformation testing evaluates the effect that load has on the shape of a sample.  It is the measurement of a sample to withstand a permanent deformation and/or the ability of the sample to return to its original shape after deforming.  Deformation is measured as the percentage change in height of a sample, under a specified load, for a specified period of time.  

A spring test is a type of deformation test where a spring is compressed to an L₁ and L₂ height and the load measurement is taken at each point and compared to a specified load.  Spring rate can be determined. 

Deformation testing car be carried out on a range of Lloyd Instruments materials testing machines together with NEXYGENPlus data analysis software when more comprehensive testing results are required.

Typical graphs showing deformation tests.

Graph showing offset yield strength.

Graph showing elastic limit.

Graph showing break strength.

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