Observation of crack tip vicinity by the high-speed camera and research on dynamic fracture toughness

2002 ◽  
Author(s):  
Kensuke Ichinose ◽  
Fumitaka Moriwaki ◽  
Kenji Gomi
Keyword(s):  
Fracture Toughness ◽  
Dynamic Fracture ◽  
High Speed ◽  
Crack Tip ◽  
Dynamic Fracture Toughness ◽  
High Speed Camera

scholarly journals Experimental Measurement of the Temperature Rise Generated During Dynamic Crack Growth in Metals

1990 ◽  
Vol 43 (5S) ◽  
pp. S260-S265 ◽  
Author(s):  
Alan T. Zehnder ◽  
Ares J. Rosakis
Keyword(s):  
Fracture Toughness ◽  
Dynamic Fracture ◽  
High Speed ◽  
Crack Tip ◽  
Dynamic Fracture Toughness ◽  
Plastic Work ◽  
Temperature Fields ◽  
Plastic Strain Rate ◽  
Maximum Temperature ◽  
Large Temperature

During the high speed propagation of cracks, large temperature increases occur at the crack tip due to the intense dissipation of plastic work there. This increased temperature may have a significant effect of the material’s dynamic fracture toughness. An experimental investigation of the temperature fields at the tip of dynamically propagating cracks in 4340 steel was performed using a focused array of high speed, infrared detectors. Temperature fields were measured for cracks growing at speeds from 700m/s to 1900m/s. Maximum temperature increases were as high as 465°C. The temperature fields were differentiated to determine the plastic work rate distribution at the crack tip and to estimate the plastic strain rate. Effects of crack tip heating on dynamic fracture toughness are discussed.

scholarly journals Rock Dynamic Fracture Characteristics Based on NSCB Impact Method

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Yanbing Wang
Keyword(s):  
Fracture Toughness ◽  
Dynamic Fracture ◽  
High Speed ◽  
Loading Rate ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Fracture Toughness ◽  
High Speed Photography ◽  
Rate Dependency ◽  
Hopkinson Pressure Bar ◽  
Rock Materials

In 2012, the International Society for Rock Mechanics (ISRM) recommended a new Notched Semicircular Bend (NSCB) method for the determination of dynamic fracture toughness of rock materials, but it did not consider the effect of some uncontrollable factors in the course of the experiment on the test result. This thesis firstly carried out dynamic fracture toughness experiments on several typical rock materials such as sandstone using the modified Split-Hopkinson Pressure Bar (SHPB) experimental system with high-speed photography, directly compared the dynamic fracture failure characteristics of several rock materials, and examined the loading rate dependency of the dynamic fracture toughness of rock materials. Based on the numerical analysis method of Discrete Lattice Spring Model (DLSM), it focused on the effect of bullet impact loading rate, loading area of incident bar, support restraints of clamping specimen, and other uncontrollable factors in the course of SHPB experiment on test results. The findings can be referenced for the improvement of NSCB method.

Dynamic fracture toughness (JId) behavior of armor-grade Q&T steel weldments: Effect of weld metal composition and microstructure

2009 ◽  
Vol 15 (6) ◽  
pp. 1017-1026 ◽  
Author(s):  
Govindaraj Magudeeswaran ◽  
Visvalingam Balasubramanian ◽  
S. Sathyanarayanan ◽  
Gankidi Madhusudhan Reddy ◽  
A. Moitra ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Weld Metal ◽  
Dynamic Fracture ◽  
Dynamic Fracture Toughness ◽  
Metal Composition ◽  
Weld Metal Composition
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