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Specimen Alignment in Material Testing

Specimen alignment plays a critical role in material testing. If a specimen is not properly aligned prior to or during testing, the accuracy and the reliability of test results will be directly affected, and, depending on the method followed, results may not be acceptable. This post covers the effect of specimen misalignment on the test data, main reasons behind axial misalignment, and ways to improve alignment precision in mechanical test setups.

Small Specimen Fatigue Testing

Studying fatigue properties of small specimens can be challenging, yet is needed for research purposes as well as for product and verification testing in industries like the medical device and additive manufacturing.

Fatigue testing allows manufacturers and researchers to get a critical understanding of how a material or component will perform in real-world loading scenarios over the course of time. Common fatigue testing definitions and keywords include:

Stress-Life Fatigue Testing Basics

ADMET CEO and Chief Engineer Richard Gedney's article on fatigue testing applications was published on the Quality Magazine August 2017 issue. 

The article starts with brief descriptions of the four stages of metal fatigue:

Stage 1: Crack Initiation

Stage 2: : Slip Band or Stage 1 Crack Growth

Stage 3: Stage II Crack Growth

Stage 4: Ductile Failure 

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