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J integralThe J-integral represents a way to calculate work (energy) per unit fracture surface area in a material.^{[1]} J_{1c} defines the point at which large-scale plastic yielding during propagation takes place under mode one loading.^{[1]} This value is difficult to determine experimentally, however in 1968 Jim Rice developed the J-integral test that allows one to calculate fracture toughness (K_{1c}) for materials in which sample sizes are too small (on the order of < 1 meter) for direct determination of K_{1c}. Physically the J-integral is related to the area under curve of a load versus load point displacement.^{[2]}. Additional recommended knowledgeJ-Integral and Fracture ToughnessThe J-integral can be described as follows^{[1]}
where
Fracture toughness is then calculated from the following equation^{[1]}
where
See also
ReferencesCategories: Materials science | Materials testing |
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "J_integral". A list of authors is available in Wikipedia. |