Estimation of Work-hardening Curve for Large Strain Using Friction-free Compression Test☆
Estimation of Work-hardening Curve for Large Strain Using Friction-free Compression Test☆
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DOI：
10.1016/j.proeng.2014.10.008
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
M. Usami;T. Oya
中科院分区：
文献类型：
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作者：
M. Usami;T. Oya
为预测成形极限，进行了成形模拟。加工硬化曲线是影响成形模拟可靠性的重要因素。大应变区的测量方法尚未建立。提出了一种确定大应变区加工硬化曲线的新方法。该方法包括压缩试验和优化方案。优化中，采用最小二乘法，根据压缩试验和有限元分析得到的载荷与位移关系确定加工硬化曲线。夹具的设计是为了通过限制试样和夹具之间的滑动来消除摩擦的影响。哑铃形试样的设计是为了防止与夹具再次接触。试验采用低碳钢作为试样。对该方法进行了验证，得到了大应变区的加工硬化曲线。
Forming simulation has been carried out for prediction of forming limits. Work-hardening curve is deeply involved in the reliability of the forming simulation. Measurement method of large strain region has not been established. In this paper, a new method of determining work-hardening curve of large strain region is proposed. The proposed method consists of compression test and optimization scheme. In the optimization, using the least-square method, the work-hardening curve is determined from the relationship of load and displacement obtained by the compression test and finite element analysis. Jigs are designed to eliminate the effects of friction by constraining the slip between a specimen and jigs. Dumbbell-shaped specimens are designed to prevent re-contact with the jigs. In the experiment, low carbon steel was used as specimens. The proposed method was carried out and the work-hardening curve of large strain region was obtained.