Related Experiment Video
Updated: Jun 3, 2026
12:49
Measurement of Aggregate Cohesion by Tissue Surface Tensiometry
Published on: April 8, 2011
A technique for combined dynamic compression-shear test
1College of Science, National University of Defense Technology, 410073 Changsha, China. Zhaopengduo@163.com
The Review of Scientific Instruments
|April 5, 2011
Summary
Researchers developed a new method for applying combined compression and shear forces to materials at high strain rates. This technique enhances the accuracy of dynamic material response studies and constitutive law development.
Area of Science:
- Materials Science
- Mechanical Engineering
- Solid Mechanics
Background:
- Accurate constitutive laws require understanding material behavior under complex dynamic loading.
- Combined compression-shear loading is crucial for simulating real-world conditions.
Purpose of the Study:
- To introduce a novel technique for applying combined compression and shear loads at high strain rates.
- To enable more accurate characterization of material dynamic responses.
Main Methods:
- Utilized a specialized apparatus with a wedge-shaped incident bar to induce axial and transverse velocities.
- Employed strain gauges for compression measurements and piezoelectric transducers with a novel optical method for shear measurements.
- Developed and validated an analytic model using numerical simulations.
Main Results:
- The technique successfully applies combined compression-shear loading at high strain rates.
- Experimental validation on lead specimens showed good agreement with split Hopkinson pressure bar results.
- Analytic model predictions were consistent with numerical simulation outcomes.
Conclusions:
- The novel technique provides a reliable method for studying material dynamic responses under combined compression-shear loading.
- This advancement aids in the development of more accurate material constitutive laws.
- The method offers a valuable tool for high-strain-rate material characterization.
Related Concept Videos
01:18Shearing Stress
Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
01:20Elastic Strain Energy for Shearing Stresses
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
01:20Shearing Strain
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
01:14Normal and Shear Force
When a beam is subjected to different loads, such as weight, pressure, or other external forces, internal forces are generated within the beam. These forces can have a significant impact on the overall stability and strength of the structure. Engineers use various methods to analyze and determine the magnitude and direction of these internal forces. One common technique used to determine internal forces in beams is the method of sections. This method involves considering an imaginary point or...
01:12Non-destructive Tests for Concrete Strength
The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it to...
01:14Shearing Stresses in a Beam: Problem Solving
A cantilever beam with a rectangular cross-section under distributed and point loads experiences shearing stresses. The analysis begins by identifying the loads acting on the beam. Then, the reactions at the beam's fixed end are calculated using equilibrium equations. The vertical reaction is a combination of the distributed and point loads, while the moment reaction is the sum of their moments. The shear force distribution along the beam, resulting from these loads, is established by creating...