Quasi-static and dynamic fracture initiation toughness of Ti/TiB layered functionally graded material under thermo-mechanical loading

被引：35
|
作者：
Kidane, Addis [2 ]
Shukla, Arun [1 ]
机构：
[1] Univ Rhode Isl, Dept Mech Engn & Appl Mech, Dynam Photo Mech Lab, Kingston, RI 02881 USA
[2] CALTECH, Grad Aeronaut Labs, Div Engn & Appl Sci, Pasadena, CA 91125 USA
来源：
ENGINEERING FRACTURE MECHANICS | 2010年 / 77卷 / 03期
关键词：
Fracture initiation toughness; FGM; Thermo-mechanical loading; Dynamic fracture; TIP STRESS-FIELDS; BEHAVIOR; GRADIENT;
D O I：
10.1016/j.engfracmech.2009.10.006
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Quasi-static and dynamic fracture initiation toughness of Ti/TiB layered functionally graded material (FGM) is investigated using a three point bend specimen. The modified split Hopkinson pressure bar (SHPB) apparatus in conjunction with induction coil heating system is used during elevated temperature dynamic loading experiments. A simple and accurate technique has been developed to identify the time corresponding to the load at which the fracture initiates. A series of experiments are conducted at different temperatures ranging from room temperature to 800 degrees C, and the effect of temperature and loading rate on the fracture initiation toughness is investigated. The material fracture toughness is found to be sensitive to temperature and the fracture initiation toughness increases as the temperature increases. Furthermore, the fracture initiation toughness is strain rate sensitive and is higher for dynamic loading as compared to quasi-static loading. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：479 / 491
页数：13
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