Miniature Shear Punch Test with On-Line Acoustic Emission Monitoring for Assessment of Mechanical Properties

2009 ◽  
pp. 523-523-16 ◽  
Author(s):  
KV Kasiviswanathan ◽  
SK Hotta ◽  
CK Mukhopadhyay ◽  
B Raj
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Acoustic Emission Monitoring ◽  
Punch Test ◽  
Emission Monitoring ◽  
Shear Punch Test ◽  
On Line ◽  
Shear Punch

Mechanical Properties of Nanocrystalline Cu and Cu-Zn Using Tensile and Shear Punch Tests

2009 ◽  
Vol 633-634 ◽  
pp. 373-382 ◽  
Author(s):  
J.M. Tao ◽  
Xin Kun Zhu ◽  
P.Z. Wong ◽  
Ron O. Scattergood ◽  
Carl C. Koch
Keyword(s):  
Mechanical Properties ◽  
Ball Milling ◽  
Rate Sensitivity ◽  
Physical Activation ◽  
Thermally Activated ◽  
Punch Test ◽  
Shear Punch Test ◽  
Average Grain Size ◽  
Shear Punch ◽  
Zn Alloys

Shear punch test (SPT) has been used to study the mechanical properties of Cu, Cu–10 wt.% Zn, Cu–20 wt.% Zn and Cu–30 wt.% Zn after ball milling with an average grain size in the range of 33-12nm. The strain rate sensitivity (SRS) and physical activation volume have been determined. The magnitude observed for these characteristic deformation parameters is very different from their course-grained (cg) counterpart. This suggests that the thermally activated process in nanocrystalline (nc) metal/alloys is different from the conventional forest dislocation cutting mechanism. The stacking fault energy (SFE) of Cu-Zn alloys decreased with the adding of Zn, and deformation twins are anticipated to introduce into the nc Cu-Zn alloys during process of ball milling. Dislocations could accumulate along the TBs and carry the plastic strain, so the ductility of nc Cu-Zn alloys could be improved.

Mechanical Properties of Equal Channel Angular Extruded Magnesium Boride (MgB2) Powder in Tubes (PITs)

2007 ◽  
Vol 561-565 ◽  
pp. 961-964
Author(s):  
A.V. Nagasekhar ◽  
Tick Hon Yip ◽  
R.K. Guduru ◽  
K.S. Ramakanth
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Optimal Route ◽  
Magnesium Boride ◽  
Density Measurements ◽  
Punch Test ◽  
Shear Punch Test ◽  
Shear Punch ◽  
Number Of Passes

The MgB2 PITs, prepared by filling Fe tubes with MgB2 as a core, were processed through different number of passes at room temperature via Routes A, BA, C and BC. The mechanical properties of the PITs were measured in terms of density and hardness. The extent of the compaction was also studied through shear punch test. The shape of the compacts remains circular even after four passes via Route C & BC. Higher density and hardness along with higher USS is observed from the PITs of Route C compared to Route BC. The PITs processed through Route A and Route BA did not show sufficient compaction to carryout the density measurements. Thus, the current study shows that Route C is the optimal route; to attain good mechanical properties in ECAE processed MgB2 PITs with Fe tube.

Acoustic Emission Monitoring during Solidification Processes

2006 ◽  
Vol 13-14 ◽  
pp. 299-304 ◽  
Author(s):  
Jan Crha ◽  
J. Havlíček ◽  
Jiri Molínek ◽  
Petr Kozelský
Keyword(s):  
Acoustic Emission ◽  
Structural Phase ◽  
Source Analysis ◽  
Acoustic Emission Monitoring ◽  
Emission Monitoring ◽  
Time Period ◽  
Useful Signal ◽  
Stress Changes ◽  
Solidification Processes ◽  
On Line

The paper summarizes the experiences acquired from on-line acoustic emission monitoring (herafter AE) of heavy castings during their manufacturing (solidification and following cooling in the mould). They are usually monitored elastic waves generated above all by stress changes in the solid state. In order to exactly determine plastic-elastic transition state the investigation was focused on raising the sensitivity of detection. The suitable experimental technique is discussed in the first part of this article. The main problem of the measurement by high temperatures was solved by using waveguides. It is very important in this case to select useful signal sources from mechanical and electromagnetical disturbances. Some laboratory experiments were done for studying the signal origin in the first state of solidification. The results from on-line monitoring of two types cast rolls during manufacturing were compared. Each type of casting has its typical AE histogram. For the quality evaluation ( in our case) is significant the time period of approximate 5 days after pouring . The time delayed stress induced cracking generates high level AE signal in this time period and the presence of such signal indicates defective product. The study of high temperature tensile tests, structural phase transformation and solidification processes using AE is very important for analysis of AE sources. The use of the laboratory results for the AE source analysis on real products will be subject to futher research.

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