Spherical indentation for brittle fracture toughness evaluation by considering kinked-cone-crack

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• 作者：Karuppasamy Pandian Marimuthu^a ; Felix Rickhey^a ; Jin Haeng Lee^b ; Hyungyil Lee^a ; ^{hylee@sogang.ac.kr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Fracture toughness ; Spherical indentation cracking ; Kinked-cone-cracks ; XFEM ; Roesler&rsquo ; s constant
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：37
• 期：1
• 页码：381-391
• 全文大小：2737 K

文摘

This work aims at evaluating the fracture toughness of brittle materials by spherical indentation. The cone-cracking is simulated by the extended finite element method (XFEM) in Abaqus. The formation of a kinked-cone-crack is observed when the indenter comes into (second) contact with the surface part outside the ring-crack. The effects of friction, Poisson’s ratio and cone-crack kinking on the Roesler’s constant κ_c are analyzed. Based on numerical results, the Roesler’s method for evaluating the fracture toughness is enhanced by considering kinked-cone-crack. By performing systematic XFE analyses, a database for enhanced Roesler’s constant κ_c | _kink is provided for the fracture toughness evaluation of brittle materials. Finally, the proposed method is verified by conducting spherical indentation tests on soda-lime glass specimens.