Determination of dynamic fracture parameters using a semi-circular bend technique in split Hopkinson pressure bar testing

2009 ◽  
Vol 76 (9) ◽  
pp. 1268-1276 ◽  
Author(s):  
R. Chen ◽  
K. Xia ◽  
F. Dai ◽  
F. Lu ◽  
S.N. Luo
Keyword(s):  
Dynamic Fracture ◽  
Split Hopkinson Pressure Bar ◽  
Hopkinson Pressure Bar ◽  
Fracture Parameters ◽  
Split Hopkinson ◽  
Pressure Bar

scholarly journals Dynamic fracture and energy consumption characteristics of coal-series sandstone after heat treatment

2019 ◽  
Vol 23 (Suppl. 3) ◽  
pp. 967-974
Author(s):  
Ming Li ◽  
Lin Gang ◽  
Xianbiao Mao
Keyword(s):  
Heat Treatment ◽  
Energy Consumption ◽  
Dynamic Fracture ◽  
Split Hopkinson Pressure Bar ◽  
Test System ◽  
Test Results ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Loading Tests ◽  
Pressure Bar

In this paper, the dynamic loading tests of sandstone after heat treatment at 25-800?C are carried out by using the split Hopkinson pressure bar test system. Combined with the theory of energy dissipation, the dynamic fracture and energy consumption characteristics of coal-series sandstone are systematically studied. The test results illustrate that the dynamic fracture and energy consumption characteristics of sandstone are mainly related to the changes of internal moisture and cementing materials.

Determination of the Temperature Dependent Dynamic Response of Elastomeric Materials Using the Split Hopkinson Pressure Bar

2006 ◽  
Author(s):  
Glenn E. Vallee ◽  
Steven D. Army
Keyword(s):  
Dynamic Modulus ◽  
Split Hopkinson Pressure Bar ◽  
Low Cost ◽  
Strain Rates ◽  
Hopkinson Pressure Bar ◽  
Temperature Dependent ◽  
Elastomeric Materials ◽  
Split Hopkinson ◽  
Pressure Bar

An effective, low cost method of determining the temperature dependent dynamic response of elastomeric materials at high strain rates using the Split Hopkinson Pressure Bar (SHPB) is developed. The test system allows the determination of the dynamic modulus at temperatures up to 150°C with control of specimen temperature within ± 3°C without the use of specialized equipment or cumbersome heating and positioning fixtures often required for temperature dependent testing. The test specimen is heated using a low cost electric resistance tape, which heats the transmitter and incident bars adjacent to the specimen. A finite element analysis is performed to predict the temperature vs. time response of the test specimen, which is verified using a simple thermocouple arrangement. The dynamic stress-strain response of a nitrile elastomer, commonly used as an impact absorber, is investigated over temperatures ranging from 20°C to 110°C at strain rates between 3000/s and 3500/s. The effect of strain rate on the dynamic modulus is not significant, but the effect of temperature is dramatic. The dynamic modulus of the nitrile is reduced by more than 60% at 110°C.

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