Using Small Specimens to Measure Dynamic Fracture Properties of High-Toughness Steels

2009 ◽  
pp. 24-24-13 ◽  
Author(s):  
H Conque ◽  
RJ Dexter ◽  
SJ Hudak
Keyword(s):  
Dynamic Fracture ◽  
Fracture Properties ◽  
High Toughness

A Novel Procedure for Measuring the Dynamic Fracture Toughness Using Direct Tension Hopkinson Bar

2013 ◽  
Author(s):  
Gabriel Testa ◽  
Andrew Ruggiero ◽  
Nicola Bonora
Keyword(s):  
Fracture Toughness ◽  
Dynamic Fracture ◽  
Hopkinson Bar ◽  
Relative Displacement ◽  
Dynamic Fracture Toughness ◽  
J Integral ◽  
Direct Measure ◽  
Direct Tension ◽  
High Toughness ◽  
Loss Of Contact

In this paper a technique for determining the dynamic fracture toughness is presented. The proposed experimental method is based on the use of the direct tension Hopkinson bar allowing accurate control of the generated tensile stress pulse and avoiding limitations showed by other similar configurations. The sample geometry investigated here is the circumferentially cracked bar in tension (CCB(T)). This geometry does not require special fixtures to be hold between the bars and does not suffer loss of contact during dynamic loading. Numerical simulation showed that, at least for high toughness materials, the relative displacement of the bars can be used to have a direct measure of the CTOD that can be used to derive the corresponding J-integral value.

Numerical Investigation of the Stress Wave Propagation in the Incident Bar and the Specimen

2014 ◽  
Vol 602-605 ◽  
pp. 98-101 ◽  
Author(s):  
Raja Ahsan Javed ◽  
Shi Fan Zhu ◽  
Chun Huan Guo ◽  
Feng Chun Jiang
Keyword(s):  
Stress Wave ◽  
Dynamic Fracture ◽  
Sine Wave ◽  
Stress Wave Propagation ◽  
Stress And Strain ◽  
Hopkinson Pressure Bar ◽  
Time Duration ◽  
Fracture Properties ◽  
Propagation Behavior ◽  
Pressure Bar

Hopkinson pressure bar apparatus is extensively used for the measurement of the dynamic fracture properties. For accurate measurement of the dynamic fracture properties we need to understand concepts and principles associated with the test setup. The understanding of stress wave in the bar and specimen is also very important. In the current work, ANSYS LS-DYNA software is used to simulate the propagation behavior of the time based loading and generation of stress wave. The stress and strain plots in the specimen and the incident bar are obtained as an output of the analysis. The analysis of the plots suggest that, for the same time duration the rising trend is observed for the plots of stress and strain of incident bar whereas a sine wave trend is observed for the plots in the specimen.

Dynamic Fracture Behaviors of Polypropylene/Polyamide-6 Blends

2006 ◽  
Vol 324-325 ◽  
pp. 887-890 ◽  
Author(s):  
Zheng Li ◽  
Jun Wang ◽  
Wei Zhong Qin
Keyword(s):  
Polymer Blends ◽  
Dynamic Fracture ◽  
Damage Mechanism ◽  
Polyamide 6 ◽  
Dynamic Fracture Toughness ◽  
Moving Crack ◽  
Fracture Properties ◽  
Process Dynamic ◽  
Fracture Behaviors ◽  
Crack Growth Velocity

The dynamic fracture properties of polypropylene/nylon-6 (PP/PA6) blends, with different weight fractions and different compatibilizars, are investigated by reflected dynamic caustics experiments. According to the shadow spot patterns around a moving crack tip, which are recorded during the dynamic fracture process, dynamic fracture toughness and crack growth velocity can be estimated to evaluate the fracture properties of polymer blends. Moreover, combined with microscopic observation, the damage mechanism of the polymer blends is discussed.

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