Dynamic fracture behavior of a MAX phase Ti₃SiC₂

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• 作者：L. Shannahan ; M.W. Barsoum ; L. Lamberson ; ^{les@drexel.edu}
• 关键词：Dynamic fracture ; MAX phase ; Mixed-mode ; Layered structure ; Mesoscale toughening
• 刊名：Engineering Fracture Mechanics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：169
• 期：Complete
• 页码：54-66
• 全文大小：1638 K
• 卷排序：169

文摘

Due to their layered structure, MAX phase ternary carbides and nitrides exhibit unique mechanical properties between their metal and ceramic constituent materials. Pre-cracked coupons of MAX phase Ti3SiC2 were impacted at 4 m/s, and high-speed imaging, combined with digital image correlation (DIC), captured full-field displacement data during loading and subsequent fracture. An over-deterministic least squares analysis was used to extract dynamic anisotropic mixed-mode stress intensity factors (SIFs). Critical Mode I (opening) SIFs at initiation are comparable to quasi-static fracture values in the literature averaging 6.9 MPa m1/2, but SIFs increase 20% during propagation, with increased crack tip sliding behavior influenced by inherent mesoscale toughening mechanisms.