CMOD/CTOD
Crack mouth opening displacement and crack tip opening displacement
CMOD/CTOD – Crack mouth opening displacement and crack tip opening displacement are terms used to describe the change in distance, normal to the crack plane, between the two faces of a fatigue-cracked notch in a fracture toughness test specimen. CMOD is measured on the loading line or on the surface of the specimen as the difference between the original and the final crack opening. CTOD is calculated at a defined location, near to the original crack tip, using a mathematical relationship based on CMOD and the applied force.
CTOD is used as a fracture mechanics parameter in elastic-plastic materials and represents the ability of the material to resist crack extension through strain at the crack tip.
For more information on CMOD/CTOD and their use in fracture mechanics see:
www.twi-global.com/technical-knowledge/published-papers/ctod-and-pipelines-the-past-present-and-future/
What the hec?! articles are not intended to be the definitive account on the topic or acronym in question. Readers’ comments and contributions are welcomed. Email: ndtnews@bindt.org
CTOD is used as a fracture mechanics parameter in elastic-plastic materials and represents the ability of the material to resist crack extension through strain at the crack tip.
For more information on CMOD/CTOD and their use in fracture mechanics see:
www.twi-global.com/technical-knowledge/published-papers/ctod-and-pipelines-the-past-present-and-future/
What the hec?! articles are not intended to be the definitive account on the topic or acronym in question. Readers’ comments and contributions are welcomed. Email: ndtnews@bindt.org
