A Study was Conducted to Investigate the Effects of Varying Reaction Intensities of Constrained Charges

In order to overcome the key technological challenge of regulating the reaction intensity of constrained explosives in experiments and testing, and to address the issue of multi-parameter comprehensive testing of characteristic parameters across different typical reaction intensity levels, a quasi-two-dimensional experimental testing system for controllable reaction intensity of constrained explosives has been developed. By varying the thickness of the constraint body, the installation constraint intensity can be altered to achieve typical reaction modes such as combustion, detonation, and explosion. This allows the distribution characteristics of key parameters characterising the typical reaction modes of explosives to be obtained. The research findings indicate that under weak constraint conditions, the highest reaction pressure of TNT charge is 86.1 MPa, the cylinder does not expand, and the reaction intensity of the charge is combustion. Under moderate constraint conditions, the maximum reaction pressure of TNT charge is 762.6 MPa, the cylinder undergoes significant expansion, the lateral wall movement speed is 16.6 m/s, and the reaction intensity of the charge is detonation. In the case of weak constraint conditions, the maximum reaction pressure of the TNT charge is 86.1 MPa, the cylinder does not expand, and the reaction intensity of the charge is combustion. In the case of moderate constraint conditions, the maximum reaction pressure of the TNT charge is 762.6 MPa, the cylinder undergoes significant expansion, the lateral wall movement speed is 16.6 m/s, and the reaction intensity of the charge is detonation. In the case of strong constraint conditions, the maximum reaction pressure of the TNT charge is 1411.9 MPa (top cut), the cylinder undergoes fragmentation, the lateral wall movement speed is 202.5 m/s, and the reaction intensity of the charge is explosion. In the detonation reaction mode, the lateral wall movement speed of the cylinder is 333.5 m/s. The experimental research on the reaction intensity of constrained charges provides a basis and support for the quantitative characterisation and evaluation methods of reaction intensity.