A strain-dependent ductile damage model and its application in the derivation of fracture toughness by micro-indentation
2014; Elsevier BV; Volume: 67; Linguagem: Inglês
10.1016/j.matdes.2014.11.010
ISSN0261-3069
AutoresJinghui Li, Fuguo Li, Xinkai Ma, Qianru Wang, Junzhe Dong, Zhanwei Yuan,
Tópico(s)Advanced Surface Polishing Techniques
ResumoIn 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%.
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