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A dynamic punch method to quantify the dynamic shear strength of brittle solids
1Department of Civil Engineering and Lassonde Institute, University of Toronto, Ontario M5S 1A4, Canada.
The Review of Scientific Instruments
|June 7, 2011
Summary
This study introduces a novel punch shear device for measuring the dynamic shear strength of brittle solids. The method accurately quantifies this crucial material parameter under impact loading conditions.
Area of Science:
- Geotechnical Engineering
- Material Science
- Solid Mechanics
Background:
- Shear strength is a critical parameter for brittle solids, essential for material failure models.
- Existing methods for quantifying shear strength are limited to static loading conditions.
- A gap exists in measuring the dynamic shear strength of brittle materials.
Purpose of the Study:
- To present a novel punch shear device for measuring the dynamic shear strength of brittle solids.
- To enable accurate quantification of shear strength under dynamic loading.
- To provide a method applicable to various brittle materials.
Main Methods:
- Utilizing a split Hopkinson pressure bar (SHPB) system to apply dynamic loads.
- Employing a specialized sample holder to minimize bending stress during punching.
- Incorporating a momentum-trap technique for soft recovery of sample fragments.
Main Results:
- Successfully measured the dynamic shear strength of an isotropic, fine-grained sandstone.
- Demonstrated the device's flexibility and applicability.
- Obtained dynamic shear strengths consistent with dynamic tensile strengths from literature.
Conclusions:
- The developed punch shear device effectively measures dynamic shear strength in brittle solids.
- The method aligns with classical failure models like Mohr-Coulomb.
- This provides a valuable tool for understanding material behavior under dynamic stress.
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