饱和冲量及其等效方法在舱室内爆炸中的应用

[目的]对于受到爆炸脉冲载荷冲击作用的船体结构,基于饱和冲量现象的相关研究表明,仅根据最大载荷幅值和脉冲总冲量来设计船体结构是不合理的,需探究工程应用中的饱和冲量现象.[方法]首先,总结饱和冲量概念的提出及研究发展;然后,以舱室内爆炸为典型算例,分析内爆炸载荷的曲线特性及结构响应特征;最后,基于饱和等效方法将复杂的内爆...

Saturated impulse and application of saturation equivalent method in cabin explosion

[Objectives]For the ship structures subjected to pulse loading such as explosion or slamming,research on the"saturated impulse"phenomenon shows that designing hull structures with maximum loading amplitude and total impulse is unreasonable.Hence,exploring the application of saturated impulse in engineering is necessary.[Methods]The concept and development of the saturation phenomenon are first summarized.Then,taking a cabin internal explosion as a typical example,the loading curve and structural response characteristics are analyzed by FEM.Following that,the complex blast loadings are equivalent to the rectangular pressure pulse loadings of the saturated equivalent method,and the response of structures under the equivalent loadings are calculated by theoretical and numerical methods.[Results]The results show that the saturated impulse phenomenon exists in a wide array of cabin explosions due to the existence of quasi-static overpressure.In practical engineering problems,the explosion loading will produce large plastic deformation(usually more than 10 times the plate thickness),with an error of less than 10%between the analysis results and the numerical simulation results,by using the equivalent method based on saturated impulse.[Conclusions]By studying the cabin internal explosion saturation phenomenon,the results of the plastic dynamic response of the structure can be given more accurately,and repeated complex nonlinear numerical calculations can be reduced in structural optimization,so as to carry out the anti-impact design of the hull structure more effectively.