评价爆炸超压作用的一个新指标及其在一次型FAE中的应用

New parameter for evaluating explosion pressure effects and its use in directly ignited FAE

利用单自由度体系在爆炸载荷作用下的动力响应的数值解,提出了一个近似关系式,进而得到一个新评价指标ΔP0m7.42i0+.258。同时给出了一次型FAE的TNT比当量的计算方法,分别以超压峰值ΔPm和ΔP0m.742i0+.258为评价指标计算了某一次型FAE的TNT比当量,并进行了比较。结果表明,单纯以超压峰值为评价指标的TNT比当量结果低估了一次型FAE的超压作用。鉴于爆炸超压场测试仪器与技术已能够容易地准确测量超压峰值与比冲量,建议以ΔP0m.742i0.+258为一次型FAE的TNT比当量的评价指标。

The present paper is aimed to introduce a new parameter derived by the authors in defining and evaluating the over-pressure effects, that is, △Pm^0.742i＋^0.258 and its application in the directly ignited FAE. As is known, the destructive effects of the explosive power on the targeted structures in most cases are highly dynamic （other choices are impulse and quasi-static） in nature. However, the currently available parameters for characterizing and evaluating such effects in the dynamic zone seem to be lacking in solid theoretical grounds. Thus, it comes to the need for the paper to derive the new parameter on the basis of numerical simulation of the dynamic response of the single-freedom-degree-system to the explosions for a more appropriate expression of the response. The new parameter,△Pm^0.742i＋^0.258 , has been derived by means of combining the peak over-pressure and the impulse. At the same time, a method for calculating the TNT equiva- lence of single-event FAE has been provided. Calculations have also been made for some single-event FAE with the method based on the peak over-pressure itself and the method based on the new parameter accordingly, with necessary comparisons being mentioned. The results of our trial use prove that the TNT equivalence based on the over-pressure only is less than that based on the new parameter. Therefore, it is recommended to use the new parameter herein introduced for calculating and evaluating the TNT equivalence for its advantageous and satisfactory transducers and techniques in measuring the pick explosion over-pressure and the impulse.