The standard mandates that specimens be free of surface defects (bubbles, nicks) which can cause premature failure. The thickness must be measured precisely, typically between 2.0mm and 3.0mm for standard dumbbells.
The percentage of stretch achieved at the moment the specimen ruptures. jis k 6251 pdf
You can find the JIS K 6251 standard in PDF format through various sources: The standard mandates that specimens be free of
: At 100% elongation, the sensors recorded his tensile stress . He was holding firm, proving he wasn't just some "silly putty" that would ooze away under pressure. You can find the JIS K 6251 standard
| Feature | JIS K 6251 (2017) | ISO 37 (2017) | ASTM D412 (2021) | |---------|-------------------|---------------|------------------| | | Identical to ISO 37 | Base standard | Significantly different | | Test piece types | Types 1–4 (similar to ISO) | Types 1–4 | Types A, B, C, D | | Test speed | 500 mm/min (dumbbells) | 500 mm/min | 500 mm/min (Type A, B, C, D) | | Grips | Pneumatic or roller grips | Pneumatic | Pneumatic or manual | | Elongation measurement | Extensometer or grip separation | Extensometer preferred | Extensometer or marked gauge length | | Acceptance criteria | Median of 3 samples | Median of 3 samples | Median of 5 samples |
Even with the open on your screen, mistakes happen. Avoid these six frequent errors:
| Type | Overall Length | Width of Narrow Portion | Suitability | |------|----------------|------------------------|--------------| | Type 1 | ≥ 115 mm | 25 mm | Sheet, hose, tubing | | Type 2 | ≥ 75 mm | 6.0 mm | Small specimens, low force | | Type 3 | ≥ 50 mm | 4.0 mm | Micro-specimens | | Type 4 (Ring) | – | – | For small tubes or O-rings |