Explosion Safety Research Group

７Researchers:
Shiro Kubota, Yuta Sugiyama, Takahiro Tamba, Kazuya Nomura, Tomoharu Matsumura, Miyako Akiyoshi

５Contract Employees

Outline

We are conducting a wide variety of research, from basic to applied, related to explosion safety, such as safety evaluation methods and visualization techniques, technologies to reduce the effects of explosions, and safety evaluation of batteries, in order to advance the understanding of ignition and explosion phenomena of high-energy materials, as typified by explosives.
We also actively respond to the governmental needs for explosives and conduct large-scale field experiments on explosives. The results obtained are reflected in the creation of standards for safe explosives handling technology, and are also used to help formulate international standards for the handling of hazardous materials through proposals for UN testing, thereby contributing to the realization of a safe and secure society.

Research Highlights

Development of Methods and Techniques for Evaluating and Mitigating Explosion Effects

Explosion Tests in the Field

Assessing the effects occurring at the time of explosion (blast wave, fragment characteristics, ground vibration, radiant heat, explosion sound)
- Developing technologies to reduce the explosion effects
- Reduction of required safety distance for more effective space utilization, etc.
- Obtaining scientific evidence and basic data for amendment of Explosives Control Act

→ Contributing to the formulation of standards for techniques for handling explosives

Detonation of ANFO explosive

Ref: Report on technical standard for explosion mitigation of explosives (2016)

Small-scale indoor experiments

Complementing field experiments with multi-point measurements and optical visualization.
Development of technology to reduce blast effects by buffer materials.

Optical visualization of shock front of blast wave

Blast isobaric diagram

Ref: Report on technical standard for explosion mitigation of explosives (February 2021)

Numerical Simulation Techniques

Developing techniques for predicting explosion effects based on numerical calculations

Modeling of magazines for explosives

Multiple blast waves released from the magazine

Repeated reflection of the blast wave and its propagation toward the exit

→Understanding of the propagation behavior and mitigation mechanism of the blast wave from the magazine

Evaluation Techniques for Explosion Safety for Energetic Materials

Research for detonation of condensed explosives

- Measurement technology for high-speed phenomena
- Reactive flow simulation for detonation phenomena

Gap test for explosives

Explosivity evaluation by exothermic decomposition energy

Development of “Method for measuring exothermic decomposition energy as a method for evaluating the explosive hazard of chemical substances, JIS K4834.
Development of accurate exothermic hazard evaluation method for chemical substances that react with metal containers.

☛Gold plating ≠ gold

☛☛There are different types of glass containers on the market, and the results differ.

Ammonium nitrate exothermic decomposition energy

Development of advanced JIS for stability testing of explosives.

A method for quantifying gases generated from explosives containing nitrocellulose and for evaluating the stability of explosives with high precision was added to JIS.
Amended JIS K 4810(2023).
Standardization of MV test method and test papers using methyl violet paper was added to JIS.
Amended JIS K 4822(2023).

BJS test tube

Safety Evaluation of Batteries

Gas analysis of Lithium-Ion Battery fires
Investigation of fire suppression strategies

Lithium-Ion Battery fire

Pyrotechnics Research

Development of low-environmental-impact pyrotechnics
Pyrotechnics safety research

Acceleration of a small pyrotechnic device in a tube

Combustion of colored firework stars with different compositions

International contributions for explosion safety

Classification of Explosives and Energetic Materials for Safety

Participation in TDG and GHS organized by the United Nations and international coordination of chemical substance regulations.
Contributed to the formulation of international standards for the handling of hazardous substances by proposing MTC.

Development of technologies for more effective use of explosives

High-Efficiency Production Technique for Detonation Nanodiamond

Development of original explosion device

→ Patent of production method at a low-cost and high-efficiency

Development of Functional Materials by Shock Compression

Light-emitting materials, carbon based materials, etc.

Synthesis of energetic materials having nanostructures

Synthesis of nano-nitrocellulose

→ Improvement of combustibility and application to new devices