Article ID Journal Published Year Pages File Type
7220835 Materials & Design (1980-2015) 2015 35 Pages PDF
Abstract
In order to integrate different types of ductile damage characteristics (damage variable D, void volume fraction f and Young's modulus E), a strain-dependent ductile damage model based on the continuum damage mechanics (CDM) was established. Subsequently, the damage model was used to derive fracture toughness by micro-indentation through the sequent calculations of critical indentation depth and critical surface energy per unit area. Experimental researches of inspecting the newborn model and fracture toughness derivation by micro-indentation were conducted by repeated loading-unloading tests of stainless steel (SS 302) and micro-indentation test of Ti-6Al-4V α phases. The repeated loading-unloading results confirmed the accuracy of the strain-dependent ductile damage model, and the fracture toughness from micro-indentation test agreed well with theoretical calculation within an approximately relative difference of 7.4%.
Related Topics
Physical Sciences and Engineering Engineering Engineering (General)
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