What is ISO 26843- Metallic materials- Charpy-type test pieces about?
ISO 26843 is a safety standard on metallic materials. ISO 26843 specifies requirements for performing and evaluating instrumented Pre-cracked Charpy impact tests on metallic materials using a fracture mechanics approach. Minimum requirements are given for measurement and recording equipment such that similar sensitivity and comparable measurements are achieved.
Dynamic fracture mechanics properties determined using ISO 26843 are comparable with conventional large-scale fracture mechanics results when the corresponding validity criteria are met. Because of the small absolute size of the Charpy specimen, this is often not the case. Nevertheless, the values obtained can be used in the research and development of materials, in quality control, and to establish the variation of properties with test temperature under impact loading rates.
Fracture toughness properties determined using ISO 26843 may differ from values measured at quasi-static loading rates. Indeed, an increase in loading rate causes a decrease in fracture toughness when tests are performed in the brittle or ductile-to-brittle regimes; the opposite is observed (i.e., increase in fracture toughness) in the fully ductile regime.
Who is ISO 26843- Metallic materials- Charpy-type test pieces for?
ISO 26843 on measuring the fracture toughness at impact loading rates using pre-cracked Charpy-type test pieces for metallic materials is relevant to:
- Metallurgical engineers
- Manufacturers of instrumented testing machines
- Testing authorities
Why should you use ISO 26843- Metallic materials- Charpy-type test pieces?
ISO 26843 prescribes impact bend tests which are performed on fatigue pre-cracked Charpy-type specimens to obtain dynamic fracture mechanics properties of metallic materials. ISO 26843 extends the procedure for V-notch impact bend tests in accordance with ISO 148-1 and is used for the evaluation of the primary curve reference temperature in accordance with Reference [2] provided that the corresponding validity requirements are met.
Overall, ISO 26843 is useful as it provides guidance on measuring the fracture toughness at impact loading rates using precracked Charpy-type test pieces for metallic materials which can be helpful for your business by helping you evaluate and treat metallic metals and increase safety.