Split Hopkinson Pressure Bar
Split Hopkinson Pressure Bar - Related Videos
09:41
Blast Quantification Using Hopkinson Pressure Bars
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Cited by 2 •
2016
This protocol details the use of Hopkinson pressure bars to measure reflected blast loading from near-field explosive events. It is capable of interpolating a pressure-time history at any point on a reflective boundary and as such can be used to fully characterize the spatial and temporal variations in loading produced.
01:07
Bar Graph
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2023
A bar graph is also called a bar chart and consists of bars that are separated from each other. It either uses horizontal or vertical bars to show comparisons among categories. The bars can be rectangles, or they can be rectangular boxes (used in three-dimensional plots). One axis of the graph represents the specific categories being compared, and the other axis shows a discrete value. In this graph, the length of the bar for each category is proportional to the number or percent of individuals...
10:37
The Split Brain
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2023
Source: Laboratories of Jonas T. Kaplan and Sarah I. Gimbel—University of Southern California The study of how damage to the brain affects cognitive functioning has historically been one of the most important tools for cognitive neuroscience. While the brain is one of the most well protected parts of the body, there are many events that can affect the functioning of the brain. Vascular issues, tumors, degenerative diseases, infections, blunt force traumas, and neurosurgery are just some of the...
01:07
Multiple Bar Graph
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2023
As the name suggests, a multiple bar graph is the same as a bar graph but has multiple bars to depict relationships between different data values. One can include as many parameters as possible. However, each parameter must have the same unit of measurement. Each bar or column in the multiple bar graph represents a data value. These graphs are used primarily in interrelating two or more sets of data. The categories of different kinds of data are listed along the horizontal or x-axis, whereas...
07:26
Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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Cited by 5 •
2013
The laser heated diamond anvil cell combined with synchrotron micro-diffraction techniques allows researchers to explore the nature and properties of new phases of matter at extreme pressure and temperature (PT) conditions. Heterogeneous samples can be characterized in situ under high pressure by 2D mapping and combined powder, single-crystal and multigrain diffraction approaches.
FAQs
Interpretation depends on tracking the stress wave across the testing arrangement. The incident bar carries the wave generated by the striker, the specimen experiences rapid compression, and the transmitted bar receives the continuing response. Comparing recorded wave behavior across these locations allows researchers to relate loading to material deformation and eventual failure.
Strain gauges convert the bar response into measurable signals that can be analyzed for stress, strain, and strain rate. These three quantities describe not only how much a specimen deforms, but also how quickly that deformation occurs under rapid loading. Together, they provide the mechanical data needed to characterize impact-sensitive materials.
Rapid loading exposes material behavior during impact-like events, when deformation occurs over a short period. Measuring both deformation and failure under these conditions helps researchers evaluate how a material responds to sudden compression rather than only describing its general mechanical behavior. This distinction is important for analyzing traumatic injury and protective performance.
Researchers place a specimen between the incident and transmitted bars, use strain gauges to monitor wave signals, and employ a striker to initiate loading. The recorded responses are then analyzed to obtain stress, strain, and strain-rate information. This workflow connects the applied rapid compression event with measurable changes in the specimen.
In bioengineering, the specimen or device reflects the research question. Soft tissues and bone can be examined for injury-related mechanical response, while biomaterials and protective devices can be evaluated under impact-like compression. The method therefore connects biological mechanics with questions about implant performance and the design of safer biomedical or protective technologies.
Stress, strain, and strain-rate measurements can inform models of tissue response and traumatic injury, or help assess implant performance. They can also guide the development of safer biomedical and protective technologies. The central outcome is a quantitative description of how a material or device behaves during rapid compression, supporting both analysis and design.