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Spalling with HPB

Spalling Principle

A compressive stress wave in a body will reflect as a tension wave at a free boundary. If the tensile stress exceeds the material's strength, a fracture can occur - this is known as a spalling failure. The HPB can be used to load one end of  long cylindrical specimen with a known compression wave. The far end of the specimen is unsupported, which causes the wave to reflect in tension and induce a spalling failure. This method is better suited to brittle materials such as rocks, ceramics or other materials where the tensile strength is lower than the compressive strength.

Schematic

Video of marble specimen: