scholarly journals An Experimental Research on Crack Propagation Regularity During Fracture Grouting

2021 ◽  
Vol 651 (3) ◽  
pp. 032047
Author(s):  
Shaozhen Cheng ◽  
Fa Yang ◽  
Yuchen Dai ◽  
Zili Yang ◽  
Ye Shi
Keyword(s):  
Crack Propagation ◽  
Experimental Research ◽  
Fracture Grouting

Experimental Research of Acoustic Emission (AE) Testing of Blowout Preventer in the Process of Pressured

2014 ◽  
Vol 962-965 ◽  
pp. 411-414 ◽  
Author(s):  
Jun Ru Zhao ◽  
Ting Ting Miao ◽  
Guan Ga Dai
Keyword(s):  
Acoustic Emission ◽  
Crack Propagation ◽  
Experimental Research ◽  
Pressing Process ◽  
Blowout Preventer

Using acoustic emission (AE) technique, test the blowout preventer (BOP) shell with a crack in the pressing process. Firstly, cut a notch of 100mm long and 5mm wide on a BOP shell and weld partly, then pressurized by pneumatic pumps. Test the BOP shell during the crack propagation by AE. The result showed that the AE technique can reflect the activities of the defects timely and effectively, and the destroy situation of the blowout preventer shell in the process of pressured and the location was accurate.

Experimental research on surface crack propagation laws for low alloy steel

1982 ◽  
Vol 16 (1) ◽  
pp. 105-113 ◽  
Author(s):  
Kang-Sian Lee ◽  
Len-Ji Yu ◽  
Zi-Hong Jin ◽  
Kai-Zuo Liang
Keyword(s):  
Crack Propagation ◽  
Alloy Steel ◽  
Experimental Research ◽  
Surface Crack ◽  
Low Alloy Steel

scholarly journals EXPERIMENTAL INVESTIGATIONS IN CHISELLING SOLID CONCRETE

2003 ◽  
Vol 9 (1) ◽  
pp. 68-75
Author(s):  
Friedel Peldschus ◽  
Jens-Thorsten Wild
Keyword(s):  
Crack Propagation ◽  
Experimental Research ◽  
Crack Formation ◽  
Cutting Edge ◽  
Experimental Investigations ◽  
Mechanical Processing ◽  
Edge Geometry ◽  
Impact Tests ◽  
Load Effects

Experimental research was performed for analysing the chiselling process. The conditions of crack formation and crack propagation have been analysed. In the first step impact tests with a standard chisel shapes and with a pointed chisel were performed. These tests represented the basic investigations into the chisel load effects on mechanical processing of concrete. In the next step precise modifications were applied to the flat-chisel cutting edge with the aim of improving the cutting-edge geometry.

Secondary Transfer Effect of Contact

2009 ◽  
Vol 40 (2) ◽  
pp. 55-65 ◽  
Author(s):  
Thomas F. Pettigrew
Keyword(s):  
Cognitive Dissonance ◽  
Experimental Research ◽  
Intergroup Contact ◽  
Transfer Effect ◽  
Evaluative Conditioning ◽  
Transfer Effects ◽  
Secondary Transfer ◽  
Primary Reduction

This paper reviews the evidence for a secondary transfer effect of intergroup contact. Following a contact’s typical primary reduction in prejudice toward the outgroup involved in the contact, this effect involves a further, secondary reduction in prejudice toward noninvolved outgroups. Employing longitudinal German probability samples, we found that significant secondary transfer effects of intergroup contact exist, but they were limited to specific outgroups that are similar to the contacted outgroup in perceived stereotypes, status or stigma. Since the contact-prejudice link is bidirectional, the effect is inflated when prior prejudice reducing contact is not controlled. The strongest evidence derives from experimental research. Both cognitive (dissonance) and affective (evaluative conditioning) explanations for the effect are offered.

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