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正交异性非二次式新屈服函数

A New Orthotropic Non-Quadratic Yield Function
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摘要 提出一个能兼容材料“异常性能”的正交异性非二次式新屈服函数,它比Hill最近提出的同类屈服函数增添了适应板材轧向、横向和45°方向以外的材料实际性能的能力;并且式子简单,应用方便,特别是屈服函数中的待定材料常数原则上可由单向拉伸一种试验方法确定.对纯铝1100和铝铜合金2008—T4两种铝板的应用表明,本屈服函数的描述正确度比用其他屈服函数的好。 Hill in 1990 proposed an orthotropic non-quadratic yield function[4] that is applicable to those sheet metals possessing both planar anisotropy and anomalous behavior. In this paper, the author proposes a new yield function that can describe the planar anisotropy of sheet metal more fully than Hill's.The determination of constants in Hill's yield function requires test'data to be gathered for three different states of stress. The authors proposed function requires only test data for simple tension. So even though authors function is more generally applicable, yet computation with it is much simpler than computing with Hill's function. As the author docs not possess test data needed by Hill's function, the author compares computation results for sheet metal 1 100 and 2008-T4 only with two functions proposed in 1991 respectively by Montheillet et al[3] and Barlat et al[5]. Comparison shows that the author's function gives somewhat better results. The author's function can reveal that metal 1100 possesses anomalous behavior which Barlat's function cannot reveal, simply because Barlat's function treats materials as not possessing anomalous behavior. The author likes to point out that Montheillet's function treats planar anisotropy of sheet as being four-fold symmetric, which is considerally different from real anisotropy.
作者 周维贤
机构地区 西北工业大学
出处 《西北工业大学学报》 EI CAS CSCD 北大核心 1995年第2期240-244,共5页 Journal of Northwestern Polytechnical University
基金 国家自然科学基金
关键词 正交异性 屈服函数 异常性能 材料 orthotropy, yield function, anomalous behavior
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