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作为力学的分支学科之一,固体力学一直伴随着工程技术的进步而发展;同时,固体力学理论和方法的发展为工程建设提供了重要保障并促进了技术创新。
近年来,我国的重大工程建设以前所未有的态势蓬勃发展,包括高层建筑、江河大坝、大型隧道、大型桥梁、高速公路、高速铁路和海洋平台等等。这类重大工程的结构动力响应及其承载容限是必须要给予解答的基本问题。
随着工程结构的大型化(如更高的高层建筑、更大的桥梁跨度和更大的隧道截面等)、复杂化(如多种环境因素耦合的载荷作用等)和受载动力的高速化(如更快的车行速度等),大型结构工程的设计和建设不断解决了新的科技问题,同时也不断面临新问题的挑战。
作为以刊登评述文章为主的期刊,《力学进展》特别关注力学在重大工程中可能发挥的引导作用。不久前,《力学进展》编委会讨论议定:以“固体力学发展与重大工程应用”为专题,邀请这方面有造诣的专家撰写相关的评述文章。在本期里,我们先选登《高速铁路工程中若干典型力学问题》,《轻质夹层材料的制备和振动声学性能》和《爆炸与冲击动力学若干问题的研究进展》等3篇文章,以后我们将再陆续刊登这方面的文章。
我们期望,本专题以及《力学进展》的相关文章,能够给读者提供反映相关重大工程与固体力学研究耦合互动的新进展,并起到促进我国重大工程建设发展的作用。这亦是《力学进展》的重要宗旨之一。 相似文献
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刚架结构中瞬态波的传播 总被引:7,自引:0,他引:7
在改进回传矩阵法的基础上 ,引入节点质量阻尼模型 ,结合射线展开技术 ,研究刚架结构中的弹性瞬态波的传播。根据分析结果可以看出 ,节点质量对弹性波的传播影响不大 ,节点阻尼对弹性波的传播影响很大。如果选取合适的节点 ,就可以阻碍波在结构局部中的传播 ,达到结构局部控制的目的。刚架结构中的弹性瞬态波的传播 ,可以对大型刚架结构的无损检测提供一定的帮助。 相似文献
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本文考虑轴向应力波效应,利用分叉理论研究各种支承半无限长弹塑性梁的动态屈曲问题。在轴向阶梯载荷和脉冲载荷冲击下得到了梁的临界屈曲载荷及初始屈曲模态。其结果与实验现象相一致。同时也为研究结构动态屈曲问题提供了有效途径。 相似文献
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In this paper, vibration analysis of irregular-closed-cell foam plates is per-formed. A cell volume distribution coefficient is introduced to modify the original Gibson-Ashby equations of effective Young’s modulus of foam materials. A Burr distribution is imported to describe the cell volume distribution situation. Three Burr distribution pa-rameters are obtained and related to the cell volume range and the diversity. Based on the plate theory and the effective modulus theory, the natural frequency of foam plates is calculated with the change of the cell volume distribution parameters. The relationship between the frequencies and the cell volumes are derived. The scale factor of the average cell size is introduced and proved to be an important factor to the performance of the foam plate. The result is shown by the existing theory of size effects. It is determined that the cell volume distribution has an impact on the natural frequency of the plate structure based on the cell volume range, the diversity, and the average size, and the impact can lead to optimization of the synthesis procedure. 相似文献
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Thermal buckling analysis of truss-core sandwich plates 总被引:1,自引:0,他引:1
Truss-core sandwich plates have received much attention in virtue of the high values of strength-to-weight and stifness-to-weight as well as the great ability of impulseresistance recently. It is necessary to study the stability of sandwich panels under the influence of the thermal load. However, the sandwich plates are such complex threedimensional(3D) systems that direct analytical solutions do not exist, and the finite element method(FEM) cannot represent the relationship between structural parameters and mechanical properties well. In this paper, an equivalent homogeneous continuous plate is idealized by obtaining the efective bending and transverse shear stifness based on the characteristics of periodically distributed unit cells. The first order shear deformation theory for plates is used to derive the stability equation. The buckling temperature of a simply supported sandwich plate is given and verified by the FEM. The efect of related parameters on mechanical properties is investigated. The geometric parameters of the unit cell are optimized to attain the maximum buckling temperature. It is shown that the optimized sandwich plate can improve the resistance to thermal buckling significantly. 相似文献
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半无限长弹性直杆受轴向冲击载荷作用的分叉问题 总被引:8,自引:0,他引:8
受轴向冲击载荷作用的弹性杆的屈曲问题曾被许多作者从不同的角度研究过。本文以半无限长弹性直杆为研究对象,把这个问题作为由于轴向应力波的传播而导致的分叉问题,给出了它的正确提法,并通过实例作了具体的说明。 相似文献