1) forming limit curve
成形极限曲线
1.
It is assumed that the material damage in the localized zone results in the necking in the metal sheet, then the development of in-plane strain localization in sheets was analyzed and the forming limit curves (FL Cs) were predicted for Al 2023-T3 and Al 6111-T4 sheets.
最后用有限元法计算得到了2024-T3和6111-T4铝板的成形极限曲线以及相应的试验数据。
2.
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.
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。
2) forming limit curve(FLC)
成形极限曲线(FLC)
3) limit curve
极限曲线
1.
In this paper, the influence of normal forces on bending damage of rectangular beam is studied, and the deviations of neutral axis and the damage limit curves are calculated and discussed.
就轴力对矩形截面梁弯曲损伤的影响进行了分析,并对中性轴的偏移、损伤极限曲线等进行了计算、讨论;计算表明其影响是非线性的。
2.
The scheme could produce subdivision curve of C 4 continuity of limit curve,and the curve modeling was flexible.
在给定初始控制数据的条件下,可以通过对形状参数的适当选择来实现对细分极限曲线形状的调控。
4) forming limit
成形极限
1.
Suitability of some ductile fracture criteria and yield criteria in forming limit prediction;
成形极限预测韧性断裂准则及屈服准则的影响
2.
The theoretical prediction and numerical simulation of sheet metal forming limit;
板料成形极限的理论预测与数值模拟研究
3.
The forming limit of forward extrusion and cross rolling tube billet;
管坯正挤—横轧的成形极限
5) forming limits
成形极限
1.
Research on the forming limits and technology application of long shaft parts in open-die extrusion;
长轴类零件开式挤压工艺应用及成形极限研究
2.
Theoretical analyses of forming limits in tube hydroforming;
圆管受轴压和充液内高压成形极限的理论解析
3.
Experimental investigation on forming limits of AA5052 sheet in hybrid quasi-static/dynamic plane-strain tensile process
AA5052板材准静态/动态平面应变成形极限试验研究
6) forming curve
成形曲线
1.
The equation of forming curve of belt and formula of length in transition section of tubular belt conveyor are derived,which can be used to arrange the rollers rationall
本文推导出了圆管胶带输送机过渡段胶带成形曲线方程和过渡段长度计算公式,可用作合理布置过渡段托辊的依据。
补充资料:成形极限图
成形极限图
forming limit diagram
chengxing jixiontu成形极限图(forming limit diagram)由金属薄板在各种应变状态时所能达到的极限应变值所构成的图形,简称FLD。它用来表示金属薄板在出现局部变薄(失稳或颈缩)和断裂之前可能达到的变形水平。(见薄板成形性)极限应变值可采用板成形网格浏量技术实际测定或通过理论计算得到。 通过实验,求得一种材料在各种应力应变状态下的成形极限点,然后把这些点标注到以对数应变。,和::(或工程应变。;,£:)为坐标轴的直角坐标系中,即可得到实验成形极限图(图1)。由于影响因素很多,判 120广一又一一—一——一门 100卜\\} _80卜\\也l 求一}\、l 侧{\。\一一一一司 创60卜\u\z尸产一二一一州 界】,\\尹端厂尹尸产一! 事,。}1\一多卜产T} 一40卜\z尸11 20卜二L} OL一一乙士兰之兰止亡一二二一二匕一二二止 一4D一30一20一10 0 10 20 3040 短辘应变/% 图1实验成形极限图 I一安全区;I一临界区;I一破裂区据不一,实验成形极限图数据比较分散,常形成一定宽度的条带,称为临界区。在临界区以上为破裂区,在临界区以下为安全区。 板材的硬化指数n、塑性应变比r值、厚度、应变路径、应变梯度、应变速率和网格测量方法等对成形极限曲线的形状和位置都有很大影响。 (1)板材二、r值的影响。n值增加时,材料的强化效应大,会提高应变分布的均匀性,因而使成形极限曲线提高。图2是根据M一K理论(见拉仲失德)计算的结果。根据M一K理论计算,r值增大时,拉一拉区的极限应变值降低。但皮尔斯(R.Pearce)的试验结果显示,除了平面应变状态以外,r值对成形极限曲线影响不太显著,但可看出。值下降,极限应变值也下降。一 一0 .5一0.3一0.1 0 0.1 0.2 0.30.40.5‘2 一0 .4一0.2 图Zn值对成形极限曲线的影响 (2)板材厚度的影响。实验和理论分析的结果都表明、成形极限曲线随着初始板材厚度的减薄而降低。这是因为当初始板厚较薄时,由板材的表面缺陷而产生的板厚不均匀性以及内部缺陷而使实际板厚下降,变形不均等间题比板厚较厚时更加严重。因此,在相同变形条件下,薄的板材容易先发生局部失稳并达到成形极限。另外,薄的板材在变形时应变梯度小,周围材料对危险区材料的补偿作用小,也会降低成形极限。 (3)应变路径的影响。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条