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go with linear rail with measurements and set screw, we can stomach human error
consider the size of components, based on the force applied w/ SF 2-5
consider various loading “points” and shapes
tight tolerancing needed to ensure specimen parallelism etc.
Large surface area faces for datums to avoid wobble during assembly OR use flatness GD&T feature on fixture and rail
The 3 Point Bend Test provides values for the modulus of Elasticity, flexural stress, and flexural strain of a material. With the use of a universal testing machine, a load is applied to the middle of a specimen while two supports hold up the specimen. These two supporting pins are placed a set distance apart.
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