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- A very important tool in the description of sheet metal formability is the well known forming limit curve(FLC).prediction of which is generally based on models using instability theories. 失稳理论是FLC的理论基础。文章论述了FLC理论研究中存在的问题。指出:一般出厂板的表面状况不会影响板料的集中失稳;
- Forming Limit curves(FLCS) are constructed by two different kinds of shrinking methods in the paper. 用两种不同的双拉成形技术获取成形极限曲线。
- A THEORETICAL FORMING LIMIT CURVE BASED ON THE THEORY OF STABILITY 根据稳定理论建立的理论成形极限曲线
- Abstract The influence factors, such as grid size, evaluating phase and evaluating position,in determination of forming limit curves (FLCs) were researched by dynamic strain determination method. 摘要 采用动态应变测量方法对成形极限曲线(FLC)检测中网格的大小,测量的时机(破裂前或破裂后测量),测量的位置等因素进行了试验研究。
- forming limit curve 成形极限曲线
- The drawing up principle of the power limit curve of turbo-generator was introduced. 摘要介绍了汽轮发电机功率限制曲线的制订原则。
- The forming limit of 3A21 Aluminum alloy sheet was tested and the forming limit diagram (FLD) was determined. 通过标准成形极限实验获得3A21铝合金板材的成形极限图(FLD);
- Then we discuss the necessary conditions for the limit curve to be C0,C1,C2 respectively and give the derivative and second derivative of the limit curve at vertex and midpoint. 随后我们讨论了极限曲线连续,一阶连续,二阶连续的必要条件,并给出了极限曲线在顶点以及中点处的一阶导数与二阶导数显式公式。
- Then,it was dissertated that the essentiality and applied outlook of the stress-based forming limit diagram(FLSD). 介绍了基于应力的成形极限判据(成形极限应力图)的应用前景;
- Then this paper pointed out that DFC could predict the forming limit of metal sheet with low plasticity well and meantime take the change of forming path into account. 指出利用韧性断裂准则,不但能够较好地预测塑性差的板料成形极限,而且还能考虑应变路径的变化。
- Comparison with experimental values shows that the present approach can predict the forming limit in bulging over a wide range of sheet metals. 与实验结果比较表明,该方法能在较宽的材料范围内预测胀形成形极限。
- To predict the forming limit in sheet metal forming, a ductile fracture criterion is introduced into the finite element simulation. 摘要为了准确地预测板料成形极限,将韧性断裂准则引入到有限元模拟中。
- The maximum deformation place and degree of safety strain of Cherokee panel -- cowl air chamber arefound by the grid strain analysis combined with the foming limit curve(FLC) of a plate. 通过网格应变分析,结合钢板成形极限曲线FLC,找出切诺基前围空气室板的最大变形部位,应变安全裕度。
- It puts forward calculation theory of forming limit of monolayer tube and multiplayer tube bulge, and fetches calculation formulae of forming limit. 本文采用成形极限理论和失稳理论对单层管及双层、三层复合管胀形成形的成形极限进行了理论研究,提出了单层管与复合管胀形破裂成形极限的计算理论,推导了极限应变及极限胀形系数的计算公式。
- The mandrel(including flexible balls) is the key to improving the forming limit and forming precision in thin-walled tube NC bending process. 薄壁管数控弯曲中带芯头的柔性芯模是提高薄壁管件成形极限和成形精度的关键因素。
- Plastic unstability induced by localized necking in sheet metal forming process and forming limit analysis are reviewed. 简要地评述了金属薄板成型工艺中局部化颈缩引起的塑性失稳机制和成型极限分析的成果;
- The mechanical properties and forming limit diagram(FLD) are measured and the microstructure of different rolling state is analysed. 测定了该钢的力学性能和成形极限图(FLD),分析了不同轧态的微观组织。
- Appropriate blank shape can eliminate unevenness of blank deformation, improve forming limit, reduce high of earing and volume of cutting. 如果板料形状合适,不仅变形沿板料分布不均匀的现象能够得到明显改善,而且成形极限也可有所提高,并能降低突耳高度,减少切边余量。
- The practice of tube bulge shows that the choice of loading route and forming limit of tube is important to the shape and quality of produce. 胀形生产实践表明,加载路径的选择和管坯的成形极限对管件成形及成形质量有着重要影响。
- Some applications of plastic unstability criteria on forming limit analysis and related computer simulations are discussed. 讨论了多种塑性失稳判据在成型极限分析的实验和有限元模拟两方面的应用及其局限性;