High-Temperature Split-Hopkinson Pressure Bar with a Momentum Trap for Obtaining Flow Stress Behaviour and Dynamic Recrystallisation

Strain ◽  
2014 ◽  
Vol 50 (6) ◽  
pp. 547-554 ◽  
Author(s):  
J. Kajberg ◽  
K.G. Sundin
Keyword(s):  
High Temperature ◽  
Flow Stress ◽  
Split Hopkinson Pressure Bar ◽  
Hopkinson Pressure Bar ◽  
Dynamic Recrystallisation ◽  
Split Hopkinson ◽  
Stress Behaviour ◽  
Pressure Bar ◽  
Momentum Trap

Damage Evolution in Silicon Nitride under Repeated Dynamic Loading

1991 ◽  
Vol 49 ◽  
pp. 934-935
Author(s):  
Vinod Sharma ◽  
Kenneth S. Vecchio ◽  
S. Nemat-Nasser
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Ceramic Materials ◽  
Boundary Phase ◽  
Fracture Mechanisms ◽  
Hopkinson Pressure Bar ◽  
Transient Stress ◽  
Deformation And Fracture ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
Momentum Trap

The high modulus and limited plasticity of most ceramic materials inhibits the systematic study of deformation and fracture mechanisms. However, the use of repeatedly applied transient stress pulses allows incremental damage to be introduced without necessarily fracturing the specimen. In this study two types of hot pressed silicon nitrides, one having an amorphous boundary phase (6% yttria, 3% alumina), and the other having a crystalline boundary phase (8% yttria, 1% alumina) were tested using a novel split Hopkinson pressure bar technique with a momentum trap.

Deformation of Ceramics at High Strain Rate and High Temperature Using Split Hopkinson Pressure Bar Method

2003 ◽  
Vol 2003.11 (0) ◽  
pp. 47-48
Author(s):  
Toshifumi KAKIUCHI ◽  
Chikatomo HOSOKAWA ◽  
Masanao SEKINE ◽  
Katsuhiko SATOH ◽  
Koji FUJIMOTO ◽  
...  
Keyword(s):  
High Temperature ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Pressure Bar

scholarly journals Experimental Study of the Rock Mechanism under Coupled High Temperatures and Dynamic Loads

2020 ◽  
Vol 2020 ◽  
pp. 1-19
Author(s):  
Huaming An ◽  
Tongshuai Zeng ◽  
Zhihua Zhang ◽  
Lei Liu
Keyword(s):  
High Temperature ◽  
Rock Strength ◽  
Loading Rate ◽  
Split Hopkinson Pressure Bar ◽  
Strength Test ◽  
Dynamic Loads ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Rock Mechanism ◽  
Pressure Bar

With the development of modern society, geomaterials are widely used for infrastructure. These materials often experience dynamic loading and high temperature, which significantly influences the mechanical behaviour of the materials. This research focuses on the effects of the loading rate and high temperature on rock mass in terms of rock mechanism. A state-of-the-art review of rock mechanism under coupled dynamic loads and high temperatures is conducted first. The rock mechanism under static and dynamic loads is introduced. The marble is taken as the rock material for the test, while the split-Hopkinson pressure bar system is used to take the dynamic tests. In addition, the principles of the split-Hopkinson pressure bar are introduced to obtain the dynamic parameters. The fracture patterns of the uniaxial compressive strength test and the Brazilian tensile strength test are obtained and compared with those well documented in the literature. Some curves for the relationships among the loading rate, strain, temperature, compressive or tensile strengths are explained. It is conduced that with the increase of the loading rate, the rock strength increases, while with the increase of the temperature, the rock strength decreases.

SHPB Test on Dynamical Mechanical Behavior of Concrete with High Temperature

2011 ◽  
Vol 71-78 ◽  
pp. 760-763 ◽  
Author(s):  
Bin Jia ◽  
Zheng Liang Li ◽  
Hua Chuan Yao ◽  
Jun Lin Tao
Keyword(s):  
High Temperature ◽  
Strain Rate ◽  
Mechanical Behavior ◽  
Split Hopkinson Pressure Bar ◽  
Experimental System ◽  
Wave Theory ◽  
Hopkinson Pressure Bar ◽  
Temperature Changes ◽  
Split Hopkinson ◽  
Pressure Bar

An experimental system is designed by combining the split Hopkinson pressure bar (SHPB) with microwave heating device, based on stress wave theory, availability of the experiment technique is analyzed. Tests of concrete whose temperature changes from room temperature to 650°C and impact velocity from 5m/s to 12m/s are completed and for the first time high-temperature dynamical damaging phenomena of concrete are obtained. Based on data analysis, the dynamical mechanical behavior of concrete with high temperature is affected by not only the strain rate effect whose influence keeps on decreasing with temperature increasing, but also the high temperature weakening effect. And the strain rate hardening effect is coupled with high temperature weakening effect, but the latter has greater influence.

Experimental Study on Dynamic Mechanical Behaviour of Concrete with High Temperature

2011 ◽  
Vol 194-196 ◽  
pp. 1109-1113 ◽  
Author(s):  
Bin Jia ◽  
Zheng Liang Li ◽  
Lu Cheng ◽  
Hua Chuan Yao
Keyword(s):  
High Temperature ◽  
Strain Rate ◽  
Impact Velocity ◽  
Room Temperature ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Strength ◽  
Experimental System ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Pressure Bar

An experimental system of high-temperature split Hopkinson pressure bar (SHPB) was developed by combination of the split Hopkinson pressure bar (SHPB) and microwave heating system, then tests of concrete whose temperature changed from room temperature to 650°С and impact velocity from 5m/s to 12m/s were completed. Based on the test results, the dynamic strength of concrete increases with increasing impact velocity whether with high temperature or room temperature, meanwhile the dynamic strength of concrete with high temperature has the strain rate effect, but the effect keeps decreasing with temperature increasing, even at temperature above 500°С , compressive strength will not have strain rate sensitive effect any longer when strain rate surpasses a certain value. In the meantime, the strain rate hardening effect is coupled with high temperature weakening effect, but the latter has greater influence.

Constitutive Equation for 7050 Aluminum Alloy at High Temperatures

2006 ◽  
Vol 532-533 ◽  
pp. 125-128 ◽  
Author(s):  
Xiu Li Fu ◽  
Xing Ai ◽  
Song Zhang ◽  
Yi Wan
Keyword(s):  
Aluminum Alloy ◽  
Flow Stress ◽  
Constitutive Equation ◽  
Strain Rate ◽  
Split Hopkinson Pressure Bar ◽  
Test System ◽  
Machining Process ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Pressure Bar

Accurately material constitutive model is essential to understand and predict machining process. High temperature split Hopkinson pressure bar (SHPB) test system is used to investigate flow stress behavior and characteristics of 7050-T7451 aluminum alloy. Specimens are tested from 200°C to 550°C at intervals of 50°C and room temperature, at strain-rate of 2800s-1. The experimental results show that flow stress is strongly dependent on temperature as well as strain rate, flow stress decreases with the increase of temperature, while increase with the increasing of strain rate. The material parameters are determined for both Johnson-Cook constitutive equation and modified Johnson-Cook constitutive equation. The modified JC equation is more suitable for expressing the dynamic behavior of 7050-T7451 aluminum alloy.

Dynamic Compressive Performance of Concrete Exposed to High Temperature Based on Microstructure Analysis

2013 ◽  
Vol 357-360 ◽  
pp. 1389-1394 ◽  
Author(s):  
Shao Wei Yang ◽  
Zhi Guo Liu ◽  
Yong Wei Wang ◽  
Zi Rui Liu ◽  
Heng Jing Ba
Keyword(s):  
High Temperature ◽  
Split Hopkinson Pressure Bar ◽  
Compressive Loading ◽  
Hopkinson Pressure Bar ◽  
Normal Concrete ◽  
Mechanics Performance ◽  
Compressive Performance ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
Gauge Measurement

Combined with strain gauge measurement method, the modified split Hopkinson pressure bar was adopted to investigate the behavior of normal concrete and steel fiber reinforcement concrete exposed to 400°C and 800°C under axial impact compressive loading. The experimental results show that compared with normal temperature, the compressive strength and elasticity modulus of normal concrete exposed to 400°C and 800°C decrease obviously. The transformation of concrete exposed to high temperature in microstructure is analyzed by SEM. The influence of high temperature on macro mechanics performance is discussed.

Research on Mechanical Properties of Q345 Steel Impacted on High Temperature and Dynamic Shock Load

2011 ◽  
Vol 71-78 ◽  
pp. 1178-1181
Author(s):  
Peng Fei Hao ◽  
Xiao Bo Hou ◽  
Jia Zhi Gao ◽  
Yong Liu ◽  
Xue Feng Shu
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Split Hopkinson Pressure Bar ◽  
Industrial Condition ◽  
Shock Load ◽  
Test Facility ◽  
Hopkinson Pressure Bar ◽  
Steel Material ◽  
Split Hopkinson ◽  
Pressure Bar

Aiming at the reliability of Q345 steel material impacted on high temperature and dynamic shock load, its mechanical properties are studied in this paper based on the split Hopkinson pressure bar, the SHPB test facility is introduced in detail. And the stress-strain curves of Q345 steel are obtained in the special industrial condition. The flow stress decreases clearly in pace with the increasing of temperature, which provides credible technique evidences for the maintenance and health appraising of the structure.

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