【作者】 张铁军；

【导师】 陈卫东；

【作者基本信息】 哈尔滨工程大学 ， 结构工程， 2005， 硕士

【摘要】 在接触爆炸载荷作用下,随着爆炸载荷的施加,板的破坏过程可以分为三个阶段。首先是板的凹陷阶段,在这一阶段,板在接触爆炸载荷的作用下出现大的塑性变形而未断裂。其次是凹陷圆盘化阶段,在这一阶段,环向断裂出现,第一阶段的凹陷处形成与板脱离的圆盘状分离体,板上出现初始破口。最后是裂纹扩展阶段,在这一阶段,随着载荷的施加,初始破口边缘的环向应变达到最大,板开始出现径向裂纹,最终形成花瓣型的破口。 本文的主要工作是对板在不同装药量接触爆炸载荷作用下的最大变形和破口尺寸进行分析,具体包括如下内容: 1.分析板在局部冲击载荷作用下的瞬态响应,利用已经成熟的板在冲击载荷作用下的挠度理论解,推导出局部冲击载荷作用下板发生破坏所需的临界冲量,进而给出板发生冲塞所需的能量。 2.板在接触爆炸载荷的作用下会产生花瓣形裂纹,将薄板在接触爆炸载荷作用下的变形分为花瓣开裂之前和花瓣开裂之后两个阶段进行分析。利用变分原理得到了花瓣开裂瓣数和花瓣翻转的曲率半径。利用近似的能量原理,得到了装药量与破口之间的关系,计算结果与试验结果吻合较好。更多还原

【Abstract】 A typical failure mode of thin clamped circular plates subjected to localize explosive loading involves three stages with increasing intensity of applied loading. In the first dishing phase, the plate undergoes large inelastic deformation without fracture. This is followed by discing in which an initial circumferential crack detaches the circular cap from the plate. In the last petalling phase, observed under high intensity of impulsive loading, radial cracks propagate outward from the initial hole while the subsequent rotation of the plate segments leads to a number of petals.In the present paper, an analytical investigation on the deformation and failure of the plates is presented covering all the above stages of deformation with various contact explosive loading. The main works are as follows.1.the transient response of the plates under a localized pulse loading was investigated analytically. With the closed form deflection solution for thin plates subjected to localize explosive loading, the critical impulse to fracture is obtain. Furthermore, the critical energy is obtain when the plate discing.2. Fai lure by petalling occurs when thin plates subjected to contact explosive loading of cylindrical dynamite, deformation process of thing plate subjected to contact explosive loading of cylindrical dynamite is divided by two phase, namely petalling pre-occurring and post-occurring. The number of petals and the bent radius is attained by using variational principle. Finally, the relationship between the radius of crevasse and the weight of dynamite is attained based on an energy balance. The solution compares well with experimental results.更多还原