On the correlation between minimum thickness and central deflection during small punch test

详细信息    查看全文

• 作者：Pradeep Kumar^a ; J. Chattopadhyay^a ; ^b ; B.K. Dutta^a ; ^{bijon.dutta@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Miniature bend test ; Parametric study ; Fracture toughness ; Biaxial fracture strain ; FEA
• 刊名：Journal of Nuclear Materials
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：475
• 期：Complete
• 页码：37-45
• 全文大小：2087 K

文摘

Present paper deals with a detailed study on the correlation between minimum thickness (t/t₀) and central deflection (δ/t₀). Such data are obtained during the deformation of a small punch test of miniaturized specimen. Finite element studies have been carried out to investigate the effect of various parameters which are expected to influence this correlation. The parameters under consideration are material hardening, material yield stress, coefficient of friction and initial thickness of the specimen. It is shown that the correlation remains unaffected with respect to change in material parameters. Similarly, the coefficient of friction beyond 0.2 also does not affect the correlation. However, change in thickness has significant effect on the correlation. A modification has been suggested in the existing correlation to consider the influence of thickness change. The modified correlation is then used to calculate fracture toughness using the experimental results quoted in the literature. It is shown that the modified correlation improves the fracture toughness prediction considerably.