CHARACTERIZATION OF HYDROGEN-ASSISTED FRACTURE MECHANISM BY FRACTURE SURFACE TOPOGRAPHY ANALYSIS (FRASTA)

被引：0
|
作者：
Kobayashi, Takao [1 ]
Somerday, Brian [2 ]
San Marchi, Chris [2 ]
Nibur, Kevin A. [2 ]
机构：
[1] SRI Int, Ctr Fracture Phys, 333 Ravenswood Ave, Menlo Pk, CA 94025 USA
[2] Sandia Natl Labs, Livermore, CA 94550 USA
来源：
EFFECTS OF HYDROGEN ON MATERIALS | 2009年
基金：
美国能源部;
关键词：
CRACK; STRAIN;
D O I：
暂无
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The fracture surface topography analysis (FRASTA) technique was applied to the crack arrest threshold region in a wedge-opening-load (WOL) ASME SA 372 Grade J sample tested in hydrogen gas at 100 MPa. FRASTA juxtaposed and incrementally displaced conjugate fracture surface topographs to reconstruct microfracture processes, and displayed the results graphically. Although qualitative fracture surface examination revealed little evidence of intergranular cracking and did not show the precise fracture path with respect to the microstructure, FRASTA established the sequence of local microcrack formation, growth, and coalescence at the crack front. In addition, FRASTA was successful in determining the local crack opening displacement and assessing local fracture resistance.
引用
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页码：211 / +
页数：2
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