**Mandrel Testing Strain Distribution -
Summary of Problem**

**Background**

I have
received a scholarship to investigate the effect of mechanical stresses on
energy pipeline exterior protective coatings. I will conduct mandrel testing
with 10 different diameters to pipe samples with and without protective
coatings on the exterior (Tensile) side of the specimen. From these tests I am
required to find the non-uniform strain distribution on the exterior side of
the specimen, with a particular interest in the points with the highest stress
concentrations. These points are of particular interest as they will also be
the points of highest stress concentration in the protective coatings and
therefore be the most likely points of fracture in the protective coatings.

**Initial
Key Questions**

1.
How can I calculate/determine the strain applied to
the tensile side of the test specimens from the mandrel test?

2.
How can I calculate/determine the non-uniform strain
distribution over the tensile side of the test specimen and therefore find the
points of highest and lowest strain?

**Secondary
Questions**

**1.
**Can the non-uniform strain distribution be predicted
theoretically? using FEA? and how?

**Possible
Solutions**

Apply multiple strain gauges to the tensile side
of the test specimen during mandrel testing?How to interpret this data and get a useful strain distribution from it?

Any help would be greatly appreciated

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