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Material Modeling and Forming Limit Analysis of Tubular Materials for Automotive Use Subjected to Biaxial Stresses

承受双轴应力的汽车用管状材料的材料建模和成形极限分析

基本信息

批准号：
15560622
负责人：
KUWABARA Toshihiko
金额：
$ 2.37万
依托单位：
National University Corporation Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

The anisotropic plastic deformation behavior and forming limits of extruded 5000 series aluminum alloy tubes, A5154-H112, of 76mm outer diameter and 3.9mm wall thickness is investigated, using a servo-controlled tension-internal pressure testing machine. Detailed measurements were made of the initial yield locus, contours of plastic work for different levels of work-hardening, and the directions of the incremental plastic strain vectors for both linear and combined stress paths. It is found that the measured work contours constructed in the principal stress space are similar in shape, and that the directions of the incremental plastic strain vectors remain almost constant at constant stress ratios. The work-hardening behavior predicted using Hosford's or the Yld2000-2d yield functions under the assumption of isotropic hardening agrees closely with the observations for both linear and combined stress paths. The material is thus found to work-harden almost isotropically. Both yield functions are effective phenomenological plasticity models for predicting the anisotropic plastic deformation behavior of the material. Forming limit curves are plotted in strain space, as well as in stress space. The former gives a conventional Forming Limit Curve(FLC) whereas the latter gives a Forming Limit Stress Curve(FLSC). It is found that FLCs depend significantly on the strain/stress paths, but the stress states at the forming limit lie close to a single curve in the principal stress space for a variety of stress paths ; the path-dependence of the FLC vanishes when viewed in stress space. We have confirmed that this effect is not a result of the saturation tendency of the stress-strain curves of the present material at high strain levels. The FLSC concept is therefore valuable for predicting the failure of metal tubes and sheets in plane stress states, particularly in multistage forming.

采用伺服拉伸-内压试验机研究了外径76 mm、壁厚3.9mm的5000系列铝合金挤压管材A5154-H112的各向异性塑性变形行为和成形极限。详细测量了初始屈服轨迹，不同水平的加工硬化的塑性工作的轮廓，和线性和组合应力路径的增量塑性应变矢量的方向。它被发现，在主应力空间中构建的测量的工作轮廓是相似的形状，并且增量塑性应变矢量的方向保持几乎恒定的恒定应力比。使用Hosford或Yld 2000 -2d屈服函数预测的加工硬化行为的假设下，各向同性硬化同意密切与观察线性和组合应力路径。因此发现材料几乎各向同性地加工硬化。这两种屈服函数都是预测材料各向异性塑性变形行为的有效唯象塑性模型。在应变空间和应力空间中绘制了成形极限曲线。前者给出常规的成形极限曲线（FLC），而后者给出成形极限应力曲线（FLSC）。据发现，FLC依赖于显着的应变/应力路径，但在成形极限的应力状态接近一个单一的曲线在主应力空间中的各种应力路径; FLC的路径依赖性消失时，在应力空间中查看。我们已经证实，这种效应不是本材料在高应变水平下的应力-应变曲线的饱和趋势的结果。因此，FLSC的概念是有价值的预测金属管和板在平面应力状态下，特别是在多阶段成形。

项目成果

期刊论文数量（32）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Experimental verification of the path-independence of forming limit stresses

成形极限应力路径无关性的实验验证

DOI：
发表时间：
期刊：
International Journal of Forming Processes (掲載予定)
影响因子：
0
作者：
T.Kuwabara;Toshihiko Kuwabara;吉田健吾;Kengo Yoshida;吉田健吾;K.Yoshida
通讯作者：
K.Yoshida

共著: "日本塑性加工学会編:静的陽解法FEM,第8章異方性降伏関数"コロナ社(5月発刊予定). (2004)

合著者：《日本塑料工程学会：静态显式有限元法，第 8 章各向异性屈服函数》Corona Publishing（预定于 5 月出版）（2004 年）。

DOI：
发表时间：
期刊：
影响因子：
0
作者：
通讯作者：

Stress-Based Forming Limit Criterion for Aluminum Alloy Tube

铝合金管材基于应力的成形极限准则

DOI：
发表时间：
2004
期刊：
Journal of Japan Society for Technology of Plasticity 45
影响因子：
0
作者：
T.Kuwabara;Toshihiko Kuwabara;吉田健吾;Kengo Yoshida
通讯作者：
Kengo Yoshida

静的陽解法FEM(加工プロセスシミュレーションシリーズ1)

静态显式FEM（加工过程模拟系列1）

DOI：
发表时间：
2004
期刊：
影响因子：
0
作者：
T.Kuwabara;Toshihiko Kuwabara;吉田健吾;Kengo Yoshida;吉田健吾;K.Yoshida;Kengo Yoshida;Kengo Yoshida;吉田健吾;K.Yoshida;日本塑性加工学会編
通讯作者：
日本塑性加工学会編

応力を基準としたアルミニウム合金管の成形限界

基于应力的铝合金管材成形极限