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In an effort to obtain a quantitative measurement of both anteroposterior tibiofemoral position and active knee flexion we have routinely taken post-operative lateral radiographs in a position of maximal active flexion.

为了定量测量出前后位胫骨与股骨之间的相对位置及主动膝关节屈曲范围,我们常规在术后拍摄了最大主动屈曲状态时侧位 X 线片。

Secondly, taking unstiffened plate as an example, the paper applies finite element analysis to checking the validity of buckling assessment equivalent formulae of CSR including JTP and JBP, carries out comparison between JTP and JBP Rules in buckling strength assessment, and analyzes the main reasons for error. The paper also provides reference for the harmonization of Common Structural Rules.

其次,以非加筋板为例,应用有限元方法验算了共同结构规范中对屈曲强度进行等效计算的有效性,并比较了共同结构规范中JTP规范和JBP规范对屈曲强度校核的不同点,分析了规范中造成误差的主要原因,为规范的进一步调整提供了参考。

Finally, the paper taking 300,000 ton tanker for example, according to the requirement of JTP Rules, caculates the buckling strength of unstiffened panels by advanced buckling strength assessment method and the ultimate capacity of stiffened panels considering loading redistribute. At last, some useful conclusions are concluded.

最后,本文以300,000吨油船为例,根据JTP规范要求,利用高级屈曲方法对非加筋板件进行屈曲强度计算,对加筋板考虑载荷重分布进行极限强度计算,最后得出了一些有意义的结论。

A further redistribution of crimp, tending towards an equalization of warp and weft crimps, will occur when the cloth is allowed to relax off the loom.

在织物下机并充分松弛后,纱线的屈曲会进一步调整,使经纱、纬纱的屈曲趋于相同。

Post-buckling of delaminated composite laminates is an important problem of delamination analysis.

分层与屈曲相互作用引起破坏,所以后屈曲分析是分层问题的一个重要组成部分。

The paper reviews the development in the analytical theory of mechanical behavior of composites, pointing out the problems existed, presenting creatively the concept of yarn state, solving the descriptive problem of perform structure of any woven composites and laying the foundation for predetermining the elastic behavior of 3-d woven composites with computer. On the basis of yarn state, the relative cross section deformation theory is introduced, the yarn cross section deformation is studied, and the experiential formula is described in the paper on the basis of experiment. The crimping state of yarn is studied, the classical "straight warp view"is modified, and the crimp height value of crimped yarn is studied. At the same time, with shrinkage rate sine method, the paper proposes the idea which imitate the shape of crimped yarn. With the third power template curve, the paper describes the microgeometry structure of fabric, finding a brief and precise approach for the calculation of mechanical behavior of composites.

本文回顾了复合材料力学性能分析理论的发展,指出了存在的问题,创造性地提出了纱态概念,解决了任意结构机织复合材料预制件结构表征问题,进而为用计算机预报三维机织复合材料的弹性性能打下了基础;基于纱态概念,提出了相对截面变形理论,研究了纱线截面变形情况,在实验的基础上给出了纱线截变经验公式;研究了纱线屈曲状态,修正了传统的&地经纱直线论&,提出了以纱线缩率研究屈曲峰谷值的思想,同时以三次样条曲线拟合了纱线的卷曲形状,较好地描述了织物的细观几何结构,为复合材料力学性能的计算找到了一条既比较简便又比较精确的途径。

Elastic buckling and inelastic buckling of arch with and without out-of-plane brace under full span distributed load and concentrated load are investigated The effects of the brace to the out-of-plane buckling load of arch are studied.

对拱结构在全跨均布荷载和跨中集中荷载作用下的平面外屈曲性能进行了研究,其中考虑了屈曲前变形路径的影响和面外支撑情况,为工程设计提供了有参考价值的建议。

Based on this theory we deduce related equations of expansion force in plate and build elements of plate and magnetic field. After the analysis of magnetic field by FEM and some numerical computation we get the critical value of magnetic field when plate buckles.

在实现了用有限元对磁场进行三维分析基础之上,基于磁致应变假定,推导出相应等效载荷的计算公式,完成了恒定磁场作用下磁弹性矩形薄板的屈曲分析,求得了板屈曲时的磁场临界值。

The program can be used to track the limit load and flex point of space structure, can take structural imperfection into consideration, gets the buckling model and vibration model of three-dimension steel structure, analyzes the elastic-plastic status or stress distributing of any intersection and any point and draws the nephogram of stress distributing, the hysteretic line subjected to cyclic load and local buckling deformation.

本软件能够跟踪分析任意空间结构中各种反弯点和极限荷载、并能够考虑结构的缺陷分布影响、求解三维空间钢结构屈曲模态和振动模态。进而分析钢构件任意截面、任意点的应力分布及塑性屈服状态,绘制截面的应力分布云图及循环荷载下的滞回曲线,绘制钢构件的局部屈曲变形图。

In predicting tripping stress of stiffeners in stiffened panels it is necessary to calculate the local buckling strength of plate.

本文研究分析船体骨材的侧倾屈曲问题,分析中考虑了板屈曲对骨材侧倾的影响。

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