A mechanics based study of crack closure measurement techniques under constant amplitude loading

作者：Lugo M^*; Daniewicz S R; Newman J C Jr

来源：International Journal of Fatigue, 2011, 33(2): 186-193.

DOI：10.1016/j.ijfatigue.2010.08.004

• Crack closure
• Finite
• Compliance ratio

An elastic-plastic finite element model was used to simulate a growing fatigue crack in a middle-crack tension specimen made of an aluminum alloy. The finite element analysis provided the load-displacement curve at various locations as is commonly done in experimental work, and the crack opening stress intensity factor (K-op) was determined with ASTM standard methods, Elber's method, and the Adjusted Compliance Ratio (ACR) method. The performance of ACR was compared against the established standard methods. Measurement location effects on K-op and ACR were investigated. ASTM (2% offset) and ACR methods gave values that were dependent upon measurement location. Whereas, Elber's method (0% offset) gave values that were independent of measurement location.

• 出版日期2011-2