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半波数
相关语句
  half-wave number
     The results show that the increase of support stiffness leads to the rise of both buckling half-wave number and buckling coeffcient.
     重点研究了面内支承刚度对板的屈曲模态和屈曲系数的影响,结果表明,给定板的纵横比和边界转动约束刚度,支承刚度的增加可导致屈曲半波数和屈曲系数的增加。
  “半波数”译为未确定词的双语例句
     While the resistance of soil is increased and the stiffness of pile is reduced,the number of pile's destabilizing half-wave goes up.
     土的抗力增加,桩的刚度减小,桩失稳半波数增加,一般n<10。
短句来源
     Finally,a relation between R/h and the axisymmetric wave or the numbers ofhalf-waves of the rhombic-wave at buckling is given.
     最后,给出了R/h 与失稳时出现轴对称波与菱形波半波数之间的关系.
短句来源
     Furthermore, this paper has also proved the conditions of the number of longitudinal semi-waves m = 1 when a ring-stiffened cylindrical shell loses stability, demonstrating that the m value of the ring-stiffened cylindrical shell is identically equal to 1.
     本文还从理论上论证了环肋圆柱壳丧失稳定性时其纵向半波数m=1的条件,提出潜艇环肋圆柱壳的m值恒等于1。
短句来源
     The half wave number m of longitudinal instability of submarine ring-stiffened circularcylindrical shell is discussed in this paper.
     本文讨论了潜艇环肋圆柱壳总体稳定性纵向失稳半波数m的问题,m取不同值,将直接影响圆柱壳临界压力值。
短句来源
     The numbers of half wave are related with the length of drill stem,the nature of geometry and material of drill stem and the rock coefficient.
     而半波数则与钻柱长度、几何参数,材料性质及地层弹性系数有关。
短句来源
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  相似匹配句对
     And the number of longitudinal semi-waves m no longer keeps to 1 with unstable state and soon.
     失稳时纵向波数m≠1等等。
短句来源
     Half Beijinger
     个北京人
短句来源
     Half Homomorphism of Modules
     模的同态
短句来源
     While the resistance of soil is increased and the stiffness of pile is reduced,the number of pile's destabilizing half-wave goes up.
     土的抗力增加,桩的刚度减小,桩失稳波数增加,一般n<10。
短句来源
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The theory of plastic stability of cylindrical shell under axial compression has been investigated by a large number of researchers,but few experimental results have been published.This report presents a number of experimental results about the cylindrical shell whichare made of AM and 1T aluminium alloy.First,the instability process is describedand the maximum load agrees with the critical load calculated by the deformation theory.Next,the region of plastic instability and elastic instability for cylindrical...

The theory of plastic stability of cylindrical shell under axial compression has been investigated by a large number of researchers,but few experimental results have been published.This report presents a number of experimental results about the cylindrical shell whichare made of AM and 1T aluminium alloy.First,the instability process is describedand the maximum load agrees with the critical load calculated by the deformation theory.Next,the region of plastic instability and elastic instability for cylindrical shell made of1T aluminum alloy are given,the region of validity of small deflection theory is alsopresented.Finally,a relation between R/h and the axisymmetric wave or the numbers ofhalf-waves of the rhombic-wave at buckling is given.

圆柱壳受轴压的塑性稳定性的理论,曾有很多人进行过大量的探讨,但是,在实验方面研究的文章却发表得较少.本文给出了用AM 和1T 铝合金圆柱壳所做的大量实验.首先描述了观察到的失稳过程,给出了失稳时的最大载荷,它们与不考虑卸载的全量理论所算出的临界载荷符合较好.其次,给出了1T 铝合金圆柱壳塑性失稳和弹性失稳的范围,以及小挠度理论的适用范围.最后,给出了R/h 与失稳时出现轴对称波与菱形波半波数之间的关系.

Through the experiments on 81 cylindrical shells with 3 different thicknesses underaxial impact to a rigid target in the range of impact velocity V=39-166m/s,the applicable range of initial imperfection analyses is determined. The concept and criterion-of the second buckling critical velocity Vc2 suggested in Ref. [15] is applied and calculated accrding to strain rate reversal and the calculated Vc2 are in satisfactory agreement with experimental results. It is found that in the experiment under velocity VO...

Through the experiments on 81 cylindrical shells with 3 different thicknesses underaxial impact to a rigid target in the range of impact velocity V=39-166m/s,the applicable range of initial imperfection analyses is determined. The concept and criterion-of the second buckling critical velocity Vc2 suggested in Ref. [15] is applied and calculated accrding to strain rate reversal and the calculated Vc2 are in satisfactory agreement with experimental results. It is found that in the experiment under velocity VO greater than the calculated Vc2, there will be a jump of impact velocity V in the V vs. axial strain u/L curve and the cylindrical shells collapse with a serious buckling deformation. It is also found that the embryonic form of the buckling collapse mode has appeared at the very beginning of buckling. Thus, since the half-wave number of axial buckling mode is very easy to obtain, we may stiffen the shell in a way to prevent the appearance of such a collspse mode in its embryonic form and raise the critical velocity Vc2. This may be useful in structural designs.

本文通过四种材料(AM、A_3)、三种几何尺寸(R/h=5,6.7,10)的共81个圆柱壳,在39—166m/s速度范围的撞击实验,确定了塑性动屈曲理论中比较流行的初缺陷分析的适用范围;同时把作者在[15]中提出的第二失稳临界速度的概念和理论判据,用到圆柱壳撞击刚性靶的问题上,着重研究了大于或等于第二失稳临界速度(Vc_2)时的特征,根据应变率反向的判据,按照ε_2反向计算了V_(c2),其结果与实验值相符。实验中发现当大于上述计算得到的V_(c2)时,撞击速度相对轴向缩短率的曲线会出现跳跃,圆柱壳因局部产生很大的失稳变形而破坏.同时还发现这种破坏形式在撞击初期已形成雏形,这样可以通过计算的半波数而采用某些方法,例如加肋等,防止破坏雏形的形成,从而提高V_(c2),这一点可能给工程设计提供一个可循的依据.

In the case of impulsive loading, we believe the buckling takes place within a very short time tf -- the respond duration of the motion, stability of the dominant motion depends on Ihe behavior of the dominant motion within [0,tf] and so the investigation of the motion after t f is not necessary, and in the calculation of energy, the initial disturbing energy that causes the perturbation is negligible.The basic idea of the proposed energy criterion is.for a system under a certain impulsive loading, when any...

In the case of impulsive loading, we believe the buckling takes place within a very short time tf -- the respond duration of the motion, stability of the dominant motion depends on Ihe behavior of the dominant motion within [0,tf] and so the investigation of the motion after t f is not necessary, and in the calculation of energy, the initial disturbing energy that causes the perturbation is negligible.The basic idea of the proposed energy criterion is.for a system under a certain impulsive loading, when any kinematically admissible perturbation is imposed on its dominant motion, if the energy absorbed or dissipated by the system due to the perturbation is always larger than the work done by the load on the perturbation, then, the dominant motion of the system is a stable one.If the kinematic equation of the perturbed motion w(x, t) is represented by.where f is a linear differential operator in which the coefficient for the acceleration w >0 within is the inpulsive velocity. Then, the fundamental criterion can be stated as. The dominant motion is stable if for any admissible perturbatlion w (x, t) , we haveThe response duration tf can be treated as a function of the loading parameter and calculated from other consideration, the dot denotes time derivative.Note especially, the perturbation w (x, t) in addition to satisfying the geometric constraints, also possesses the following characteristics; a. The energy of the initial perturbation determined by w (x, t ) is smalland can be neglected when computing F (V, w)b. Buckling does not occur at the initial moment, so the initia values of wand its derivatives w. r. to x (needed to describe the buckled state) taken by their averages can be neglected as compared to their final values at t=tf.These characterize the perturbation at the very beginning of buckling.Denote all admissible perturbation that possess these two characteristics to form a set B. then, the sufficiency condition for stability may be written as.From this proposed modified energy criterion is derived some simple methods and formulae to estimate the buckling wave number and threshold velocity for circular cylindrical shells, stringer stiffened cylindrical shell under axial impact and rectangular plate under inplane impulsive loading. The computation is much simpler than those derived from the concept of amplification factor currently used. The comparison with existing computed and laboratory results shows good agreement.

针对冲击载荷下塑性屈曲的特点,本文提出了一种修正了的能量准则,给出了稳定性的一个充分条件,并用它处理了轴向冲击下圆柱壳和加筋圆柱壳以及平面内冲击载荷下矩形板的屈曲问题,得到了临界速度和屈曲半波数的简单的解析表达式,其中半波数的计算比通常采用的放大函数的方法大为简化。本文所得结果和已有的实验和数值结果很好地符合。

 
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