The Dynamic Response of Q345 Steel at High Strain Rates and High Temperature

2011 ◽  
Vol 121-126 ◽  
pp. 483-487
Author(s):  
Peng Fei Hao ◽  
Xiao Bo Hou ◽  
Jia Zhi Gao ◽  
Yong Liu ◽  
Xue Feng Shu
Keyword(s):  
High Temperature ◽  
High Strain Rate ◽  
Strain Rate ◽  
Industrial Structure ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Material Behavior ◽  
Loading Conditions ◽  
Hopkinson Pressure Bar ◽  
Experimental Apparatus

Mechanical properties of Q345 steel used for industrial structure under high strain rate and high temperature loading conditions such as rocket launching are required to provide appropriate safety assessment to these mechanical structures. The split Hopkinson pressure bar (SHPB) technique with a special experimental apparatus can be used to obtain the material behavior under high strain rate loading conditions. In this paper, dynamic deformation behaviors of Q345 steel under both high strain rate compressive and high temperature loading are determined using the SHPB technique.

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

Effects of automated fiber placement defects on high strain rate compressive response in advanced thermosetting composites

2021 ◽  
pp. 002199832110420
Author(s):  
Alexander Trochez ◽  
Von Clyde Jamora ◽  
Richard Larson ◽  
K. Chauncey Wu ◽  
Dipankar Ghosh ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Fiber Direction ◽  
Loading Conditions ◽  
Hopkinson Pressure Bar ◽  
Fiber Placement ◽  
Automated Fiber Placement ◽  
Pressure Bar

The effects of fiber tow gaps, overlaps, and folds on the compressive strength of a fiber-placed composite laminate under dynamic loading conditions are investigated in this work. These layup defects were placed in the 0° fiber direction within a 24-ply quasi-isotropic laminate with a [45/0/–45/90]3S stacking sequence. Different locations of the defect were considered, namely near the bottom (in the 2nd ply), middle (10th ply) and top (23rd ply) of the laminate. High-strain rate compression experiments were conducted on composite that are pristine and with embedded defects using a split Hopkinson pressure bar (SHPB). The results were used to determine the strength knockdown due to the local changes in ply morphology because of fiber bed compaction in the presence of a layup defect. The experimental results revealed the anisotropy of in-plane strength coinciding with the deposited defect orientation. No significant variations in the residual strength were observed regarding the location of the defect (i.e., bottom, middle, or top) within the laminate. A morphological analysis based on microtomography of the cured defects indicates that the sources of the strength knockdown are due to the 0° ply drop-off, fiber misalignment in the adjacent 90° and 45° degree plies and the resin-rich region formed at the corner of the tapered 0° ply, between +45° and –45° laminas. The present study indicates the increased role of local morphological ply variations on the strength of composites under high-strain rate loading conditions, which should be considered during composite design.

Experimental Study of Failure Mode Transition in Semi-Crystalline Polymers Polypropylene under High Strain Rate

2016 ◽  
Vol 703 ◽  
pp. 149-154
Author(s):  
Yu Gang Liao ◽  
Hang Zheng ◽  
Zhi Ping Tang
Keyword(s):  
High Temperature ◽  
High Strain Rate ◽  
Strain Rate ◽  
Failure Mode ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Shear Bands ◽  
Mode Transition ◽  
Hopkinson Pressure Bar ◽  
Failure Mode Transition

The brittle to ductile failure mode transition and the formation of adiabatic shear bands (ASB) of polypropylene were observed at high strain rate impact loading. The dynamic experiments were conducted using a split Hopkinson pressure bar (SHPB) set-up with hat-shaped specimens. The post-test observations of the recovered specimens were performed by polarized light microscopy. The mechanical behaviors of specimens are strongly influenced by temperature, the strength of specimen decreases with increasing temperature. Furthermore, the specimen fractures as a brittle solid at room temperature (20°C), while at a high temperature (100°C), the specimen fractures on a ductile model. At high temperature impact tests, shear bands are observed in the shear zone of the hat-shaped specimen, and the cracks formed at the corners propagate along the shear bands.

scholarly journals FINITE ELEMENT BEHAVIOR OF AA7075 UNDER SQUARE SHAPE OF STRIKER OF SPLIT HOPKINSON PRESSURE BAR WITH VARYING LOADS

2021 ◽  
Author(s):  
Manish Kumar Gupta ◽  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Material Behavior ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Strain Rate Behavior ◽  
Pressure Bar ◽  
Aluminum Alloy 7075

To know the high strain rate behavior of aluminum alloy 7075 (AA7075) is very significant due to its vital uses in aviation, buildings, and automobile industries. Taylor impact test, projectile tests and split Hopkinson pressure bar are usually utilized to know the behavior of materials under high strain rate conditions. But due to lack of availabilities and very costly setups, various types of changes can’t be done easily. However, numerical simulation gives opportunity to observe the phenomena of materials under different conditions without much cost. This paper investigated the behavior of square shaped specimens of AA7075 under varying impact velocities of impact velocities of 20m/s-50m/s of square striker bar of SHPB using Abaqus. To understand the importance of shape, striker bar and specimen shape are varying from square to circular under dynamic conditions. Results obtained under varying conditions indicated that the material behavior strongly dependent to the strain rates, striker shapes and specimen shapes.

Tension and Compression Behavior of Pre-Stressed Steel Strands at High Strain Rate

2011 ◽  
Vol 82 ◽  
pp. 154-159 ◽  
Author(s):  
Anatoly M. Bragov ◽  
Ezio Cadoni ◽  
Alexandr Yu. Konstantinov ◽  
Andrey K. Lomunov
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
High Strength ◽  
Gauge Length ◽  
Hopkinson Pressure Bar ◽  
Dog Bone ◽  
Tension And Compression ◽  
Set Up

In this paper is described the mechanical characterization at high strain rate of the high strength steel usually adopted for strands. The experimental set-up used for high strain rates testing: in tension and compression was the Split Hopkinson Pressure Bar installed in the Laboratory of Dynamic Investigation of Materials in Nizhny Novgorod. The high strain rate data in tension was obtained with dog-bone shaped specimens of 3mm in diameter and 5mm of gauge length. The specimens were screwed between incident and transmitter bars. The specimens used in compression was a cylinder of 3mm in diameter and 5mm in length. The enhancement of the mechanical properties is quite limited compared the usual reinforcing steels.

Experimental and Numerical Study of Soft Tissue Surrogate Behavior Under Ballistic Loading

2012 ◽  
Author(s):  
Ericka K. Amborn ◽  
Karim H. Muci-Küchler ◽  
Brandon J. Hinz
Keyword(s):  
Soft Tissue ◽  
Constitutive Model ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Numerical Study ◽  
Constitutive Models ◽  
Material Behavior ◽  
Good Representation

Studying the high strain rate behavior of soft tissues and soft tissue surrogates is of interest to improve the understanding of injury mechanisms during blast and impact events. Tests such as the split Hopkinson pressure bar have been successfully used to characterize material behavior at high strain rates under simple loading conditions. However, experiments involving more complex stress states are needed for the validation of constitutive models and numerical simulation techniques for fast transient events. In particular, for the case of ballistic injuries, controlled tests that can better reflect the effects induced by a penetrating projectile are of interest. This paper presents an experiment that tries to achieve that goal. The experimental setup involves a cylindrical test sample made of a translucent soft tissue surrogate that has a small pre-made cylindrical channel along its axis. A small caliber projectile is fired through the pre-made channel at representative speeds using an air rifle. High speed video is used in conjunction with specialized software to generate data for model validation. A Lagrangian Finite Element Method (FEM) model was prepared in ABAQUS/Explicit to simulate the experiments. Different hyperelastic constitutive models were explored to represent the behavior of the soft tissue surrogate and the required material properties were obtained from high strain rate test data reported in the open literature. The simulation results corresponding to each constitutive model considered were qualitatively compared against the experimental data for a single projectile speed. The constitutive model that provided the closest match was then used to perform an additional simulation at a different projectile velocity and quantitative comparisons between numerical and experimental results were made. The comparisons showed that the Marlow hyperelastic model available in ABAQUS/Explicit was able to produce a good representation of the soft tissue surrogate behavior observed experimentally at the two projectile speeds considered.

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