Affiliations: Shock Wave and Condensed Matter Research Center,
Kumamoto University, 2-39-1, Kurokami, Kumamoto, 860-8555, Japan.
Tel: +81-96-342-3299; FAX: +81-96-342-3299; E-mail:
[email protected] | Yatsushiro National College of Technology, 2627,
Hirayama-shinmachi, Yatsushiro, Kumamoto, 866-8501, Japan
Abstract: Visualization studies were performed both experimentally and
theoretically to observe stress wave propagation in a material and its
interaction with the free surface of the material in a blasting process. PMMA
(polymethyl-methacrylate) plates were used as a transparent material. The
stress wave was generated by initiation of an electric detonator. The stress
waves in the PMMA specimen with the right-angled corner were observed by means
of the shadowgraph system using a Q switched ruby laser as a light source. In
addition to the experiment, a numerical analysis using smoothed particle
hydrodynamics (SPH) was also carried out to clarify the dynamic behavior of
stress waves in the blasting process. Transmittance and reflection of the
stress wave at the free surface could be visualized by both the experiment and
the numerical analysis.