Dynamic Analysis of Shells
Dynamic Analysis of Shells
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DOI：
10.3233/sav-1995-2507
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发表时间：
1995
影响因子：
1.6
通讯作者：
C. Steele;J. Tolomeo;D. E. Zetes
中科院分区：
文献类型：
--
作者：
C. Steele;J. Tolomeo;D. E. Zetes
壳结构几乎在每个行业中都是不可或缺的。然而，在此类结构的设计、分析、制造和维护过程中，存在许多陷阱，导致各种形式的灾难。工程师在大约 200 年的灾难中获得的经验和与灾难擦肩而过的经验体现在大公司的大量档案文献、国家规范和程序文档中。然而，shell 行为丰富的优势在于，创新之路始终敞开。在本次调查中，我们对壳结构的动态响应进行了广泛的概述。目的是让人们了解详细规范背后的基本主题，并刺激而不是限制积极的创新。这种理解对于任何计算机代码正确计算壳结构也至关重要。物理学表明薄壳结构给分析和计算带来了挑战。壳响应通常可按延伸状态、非延伸弯曲、边缘弯曲和边缘横向剪切状态进行分类。环响应提供了对拉伸和非拉伸状态下的应力、变形和共振大小的简单估计。几个 shell 示例演示了不同的状态和组合。对于高于拉伸共振的激励频率，例如在冲击和声激励中，整个壳体表面需要精细的网格。对于这个范围，模态方法和隐式方法的价值有限。球体撞击刚性表面的例子表明，塑料卸载是连续发生的。因此，没有捷径；必须包括完整的材料行为。
Shell structures are indispensable in virtually every industry. However, in the design, analysis, fabrication, and maintenance of such structures, there are many pitfalls leading to various forms of disaster. The experience gained by engineers over some 200 years of disasters and brushes with disaster is expressed in the extensive archival literature, national codes, and procedural documentation found in larger companies. However, the advantage of the richness in the behavior of shells is that the way is always open for innovation. In this survey, we present a broad overview of the dynamic response of shell structures. The intention is to provide an understanding of the basic themes behind the detailed codes and stimulate, not restrict, positive innovation. Such understanding is also crucial for the correct computation of shell structures by any computer code. The physics dictates that the thin shell structure offers a challenge for analysis and computation. Shell response can be generally categorized by states of extension, inextensional bending, edge bending, and edge transverse shear. Simple estimates for the magnitudes of stress, deformation, and resonance in the extensional and inextensional states are provided by ring response. Several shell examples demonstrate the different states and combinations. For excitation frequency above the extensional resonance, such as in impact and acoustic excitation, a fine mesh is needed over the entire shell surface. For this range, modal and implicit methods are of limited value. The example of a sphere impacting a rigid surface shows that plastic unloading occurs continuously. Thus, there are no short cuts; the complete material behavior must be included.