scholarly journals Vickers microindentation toughness of a sintered SiC in the median-crack regime

1991 ◽  
Author(s):  
Asish Ghosh ◽  
A.S. Kobayashi ◽  
Zhuang Li ◽  
C.H. Jr. Henager ◽  
R.C. Bradt
Keyword(s):  
Median Crack

Unique crack behaviors of glass BK7 occurred in successive double scratch under critical load of median crack initiation

2020 ◽  
Vol 40 (8) ◽  
pp. 3279-3290 ◽  
Author(s):  
Junyuan Feng ◽  
Zhenping Wan ◽  
Wei Wang ◽  
Xiaofang Huang ◽  
Xinrui Ding ◽  
...  
Keyword(s):  
Crack Initiation ◽  
Critical Load ◽  
Median Crack

The median crack driven by a point force

1996 ◽  
Vol 16 (11) ◽  
pp. 1209-1212 ◽  
Author(s):  
D. A. Hills ◽  
D.N. Dai ◽  
P.D. Warren
Keyword(s):  
Point Force ◽  
Median Crack

Fracture Mechanics Study on Subsurface Median Crack in Layered Structure Subjected to Mechanical Contact

2011 ◽  
Vol 121-126 ◽  
pp. 3672-3676
Author(s):  
Yu Mei Bao ◽  
Jun Lv ◽  
Ying Jun Zhang ◽  
Mei Feng Xu ◽  
Guo Zhong Chai
Keyword(s):  
Finite Element ◽  
Crack Front ◽  
Sandwich Structure ◽  
Lower Surface ◽  
Design Solution ◽  
Element Mesh ◽  
Crack System ◽  
Brittle Layer ◽  
Ultimate Failure ◽  
Median Crack

The subsurface transverse median crack system due to spherical contact in brittle coating-bond -substrate sandwich structure is investigated with an emphasis on stress intensity factor near the crack front using finite element method. This crack system emanates from the lower surface of the brittle layer and extends transversely towards the top of contact surface, resulting in ultimate failure of the structures. In this paper, finite element mesh is designed, and the crack front mesh designing solution for a surface crack subjected to remote tension is validated with Newman and Raju empirical equation. Then the proposed crack front mesh design solution is applied to a typical sandwich structure of various modeling parameters to obtain the SIF with 3D-J integral.

Microfracture about scratches in brittle solids

1979 ◽  
Vol 366 (1727) ◽  
pp. 575-597 ◽  
Keyword(s):  
Wear Rate ◽  
Residual Strength ◽  
Reasonable Agreement ◽  
Intermediate Region ◽  
Indentation Fracture ◽  
Brittle Solids ◽  
Mechanics Analysis ◽  
Theory And Experiment ◽  
Increasing Load ◽  
Median Crack

Observations of the microcracking about scratches in a number of brittle solids including sapphire and a variety of glasses are presented. The scratching was carried out primarily with a Vickers pyramid indenter under various loads at one scratching velocity. It is observed that the nature of the cracking is very similar to that occurring about a quasi-static pointed indenter. Directly beneath the indenter a well-defined median crack is formed, behind the indenter small partial Hertzian cracks develop within the track, and subsurface lateral cracking initiates from the region of the plastically deformed zone. With a Vickers pyramid the cracking phenomena may be conveniently divided into three regions with increasing load. At low loads ( P < 0.05 N) no cracking is observed, intermediate loads (0.1 N < P < 5 N) well-defined median and lateral cracks occur, at higher loads ( P > 5N) the plastically deformed track appears to shatter and the extent of lateral and median cracking is less than that occurring for the higher loads in the intermediate region. The present observations and those of others in the literature have been interpreted in terms of an approximate indentation fracture mechanics analysis, and there is reasonable agreement between theory and experiment. The paper concludes with a discussion of the implications of this work to abrasive wear rate and to the residual strength of scratched bodies.

scholarly journals Application of Acoustic Emission Technique to Identifying Median Crack Initiation (Part 1)

1987 ◽  
Vol 95 (1101) ◽  
pp. 503-508
Author(s):  
Eiichi YASUDA ◽  
Yasuhiro TANABE ◽  
Kaoru MIYAHARA ◽  
Takayuki FUKAI ◽  
Shiushichi KIMURA ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Crack Initiation ◽  
Acoustic Emission Technique ◽  
Median Crack

Experimental Investigation of Median Crack in Indentation of Optical Glass under Ultrasonic Vibration

2019 ◽  
Vol 48 (7) ◽  
pp. 722001
Author(s):  
姜晨 JIANG Chen ◽  
高睿 GAO Rui ◽  
姜臻禹 JIANG Zhen-yu ◽  
郝宇 HAO yu
Keyword(s):  
Experimental Investigation ◽  
Ultrasonic Vibration ◽  
Optical Glass ◽  
Median Crack
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