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 The dynamic responses of clamped shallow arches, made of aluminum  alloy, subjected to projectile impact are investigated experimentally. The strain recorder and high speed camera are used to study the deformation process of arches. The experimental data show that, over a small range of impact velocity, the arch undergoes a significant increase in response. The axial deformation alone the arch can be negelected during the early response phase, but it becomes an important factor during the late response phase.... The dynamic responses of clamped shallow arches, made of aluminum  alloy, subjected to projectile impact are investigated experimentally. The strain recorder and high speed camera are used to study the deformation process of arches. The experimental data show that, over a small range of impact velocity, the arch undergoes a significant increase in response. The axial deformation alone the arch can be negelected during the early response phase, but it becomes an important factor during the late response phase.  本文报导了铝合金固支浅圆拱在子弹撞击下动力响应的实验研究,试验中采用应变片测量并由高速摄影得到试件变形的瞬态记录。实验结果表明,此类浅拱的动力响应不存在失稳现象;但在某一撞击速度区间内,拱的中心位移增加较快,拱的响应前期轴力可以忽略不计,而在后期则必须考虑。  The analytical method is used for the problem of scattering of plane SHwaves by multiple shallow circulararc canyons. The multiple scattering of plane SH waves by the canyons is first expressed as the sum of series of solutions in each of local coordinates using separation of variables and is then converted into the form of dual infinite series of a local coordinate system by the Graf's addition formulas suitable for the interior and exterior problems. The solution of the problem is finally reduced to solving... The analytical method is used for the problem of scattering of plane SHwaves by multiple shallow circulararc canyons. The multiple scattering of plane SH waves by the canyons is first expressed as the sum of series of solutions in each of local coordinates using separation of variables and is then converted into the form of dual infinite series of a local coordinate system by the Graf's addition formulas suitable for the interior and exterior problems. The solution of the problem is finally reduced to solving a set of infinite algebraic equations. The numerical results of the influence of scattering on the motion on the surface of the earth are presented for the two adjacent shallow circulararc canyons with the same diameter and variable depthtowidth ratio,and the effect of screening and interaction between canyons are discussed in the paper.  本文采用解析法研究相邻多个线圆弧凹陷地形对平面ＳＨ波散射问题。文中由分离变量法把相邻多个圆弧凹陷对平面ＳＨ波的多重散射表示为各局部坐标中的级数之和，再利用Ｇｒａｆ加法公式的内域和外域表达式进一步表示某个局部坐标中的双重无穷级数形式。问题最后可归结为求解一组无穷型的线性代数方程。文末给出了相邻两个等直径浅圆弧凹陷地形的多种深宽比对地面运动的影响的计算结果，并讨论了浅圆凹陷地形对波的屏蔽及它们之间的相互作用。  Local buckling of delaminated laminates subjected to bending loads frequently bring about snapthrough buckling, which often causes delamination growth and leads the structure to failure. In this paper, an analysis is made to predict the critical load of instability of the delaminated laminates by the use of a geometrically nonlinear onedimensional finite element method. It is found that the bifurcation instability produces snap buckling without a limit point on the equilibrium path, which is quite different... Local buckling of delaminated laminates subjected to bending loads frequently bring about snapthrough buckling, which often causes delamination growth and leads the structure to failure. In this paper, an analysis is made to predict the critical load of instability of the delaminated laminates by the use of a geometrically nonlinear onedimensional finite element method. It is found that the bifurcation instability produces snap buckling without a limit point on the equilibrium path, which is quite different from the snap buckling of a shallow thin cylindrical shell under concentrated load. However, the results offer lower loads of instbility than that when the energy criterion is used. In the paper, explanation is also given.  含脱层的复合材料层板承受弯曲载荷作用会产生跳跃失稳,还常常引起脱层扩展,从而导致结构失效。本文用基于一阶剪切层板理论的几何非线性有限单元法分析了受弯曲载荷作用下含脱层层极的失稳的临界载荷。本文指出分叉失稳产生了跳跃失稳,而该跳跃失稳与浅圆拱或薄圆柱壳受向心压力作用下的跳跃失稳不同,在整体平衡路径上没有一个极限点。本文对临界载荷的计算结果比使用能量准则的结果要小,文中给出了原因。   << 更多相关文摘 
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