The term 'gauge length' refers to the part of a test specimen actually being measured for elongation during a tensile test. The term 'gauge length' refers to the part of a test specimen actually being measured for elongation during a tensile test. The term 'actual length' of a steel bar denotes the entire length of the bar. Other articles where Gauge length is discussed: materials testing: Static tension and compression tests: …the test section (called the gauge length) is measured. The permanent elongation at fracture, shall be measured on a test‐piece of circular cross‐section in which the gauge length l is equal to five times the diameter.
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