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Related Concept Videos

Impact Loading01:19

Impact Loading

Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
Load along a Single Axis01:29

Load along a Single Axis

In structural engineering, the analysis of beams subjected to varying loads is a critical aspect of understanding the behavior and performance of these structural elements. A common scenario involves a beam subjected to a combination of different load distributions.
Consider a beam of length L subjected to a varying load, which is a combination of parabolic and trapezoidal load distribution along the x-axis. In this case, it is essential to determine the resultant loads, their locations, and...
Method of Superposition01:20

Method of Superposition

The method of superposition is a crucial technique in structural engineering, used to analyze the effect of multiple loads on beams. This approach involves calculating the deflection and slope for each load on a beam separately, and then summing these effects to determine the overall impact. It is applicable only when the beam material remains within its elastic limit, ensuring that deformations are linearly elastic.
When applying the method of superposition, each type of load—whether...
Generalized Hooke's Law01:22

Generalized Hooke's Law

The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...
Distributed Loads: Problem Solving01:21

Distributed Loads: Problem Solving

Beams are structural elements commonly employed in engineering applications requiring different load-carrying capacities. The first step in analyzing a beam under a distributed load is to simplify the problem by dividing the load into smaller regions, which allows one to consider each region separately and calculate the magnitude of the equivalent resultant load acting on each portion of the beam. The magnitude of the equivalent resultant load for each region can be determined by calculating...

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Related Experiment Video

Updated: May 11, 2026

Blast Quantification Using Hopkinson Pressure Bars
09:41

Blast Quantification Using Hopkinson Pressure Bars

Published on: July 5, 2016

Blast wave loading pathways in heterogeneous material systems-experimental and numerical approaches.

Veera Selvan1, Shailesh Ganpule, Nick Kleinschmit

  • 1Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0656, USA. veera_1431@yahoo.co.in

Journal of Biomechanical Engineering
|May 24, 2013
PubMed
Summary

Field explosions create blast waves that cause traumatic brain injury (TBI) by inducing pressure pulses in the brain. Cylinder models reveal how blast wave intensity and material properties influence TBI severity.

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Evaluating Primary Blast Effects In Vitro
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Last Updated: May 11, 2026

Blast Quantification Using Hopkinson Pressure Bars
09:41

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Published on: July 5, 2016

A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials
11:28

A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials

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Evaluating Primary Blast Effects In Vitro
10:51

Evaluating Primary Blast Effects In Vitro

Published on: September 18, 2017

Area of Science:

  • Biomechanics
  • Traumatic Brain Injury Research
  • Fluid Dynamics

Background:

  • Blast waves from explosions are a significant cause of traumatic brain injury (TBI).
  • The severity of TBI correlates with the magnitude and duration of pressure pulses within the brain.
  • Understanding the mechanical pathways of blast wave propagation is crucial for TBI prevention and treatment.

Purpose of the Study:

  • To investigate the mechanical loading pathways from external blast waves to pressure pulses within a simplified head-brain model.
  • To identify how external blast characteristics and model properties influence the resulting pressure dynamics.

Main Methods:

  • An idealized fluid-filled cylinder model was subjected to experimental air blasts (Friedlander type).
  • Measurements included cylinder surface pressures and strains, and internal fluid pressures.
  • Computational simulations were used to analyze mechanical loading and pressure field development.

Main Results:

  • Mechanical loading pathways were identified, comprising direct transmissive and indirect deflection-induced loads.
  • Acoustic impedance mismatches between the cylinder and fluid significantly affect pressure pulse characteristics.
  • Cylinder flexural rigidity also plays a key role in shaping the intensity and form of internal pressure pulses.

Conclusions:

  • The study elucidates the mechanisms by which external blast waves generate traumatic brain injury-inducing pressure pulses.
  • Material properties, specifically acoustic impedance and flexural rigidity, are critical determinants of TBI severity.
  • Findings provide a foundation for developing protective strategies against blast-induced TBI.