| 薄片漏斗试样的应变等效换算与Zr-4合金疲劳寿命估算 |
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| 引用本文： | 黄学伟,蔡力勋.薄片漏斗试样的应变等效换算与Zr-4合金疲劳寿命估算[J].实验室研究与探索,2007(11). |
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| 作者姓名： | 黄学伟 蔡力勋 |
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| 作者单位： | 西南交通大学应用力学与工程系 成都610031 |
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| 摘 要： | 完成了Zr-4合金薄片漏斗小试样的横向等幅应变疲劳试验;提出了薄片漏斗试样细腰部与薄片等直试样疲劳损伤等效的局部损伤等效假设;基于弹塑性有限元分析,建立了Zr-4合金薄片漏斗小试样横向测试应变向轴向应变转换的应变等效转换模型,该模型考虑了几何效应和泊松效应;结合实验结果,提出了用于Zr-4合金应变疲劳寿命估算的Manson-Coffin(M-C)模型。研究表明:薄片漏斗小试样及其应变等效转换模型可以有效应用于薄片金属材料的低周疲劳试验和寿命估算;国标推荐的应变换算公式应用于薄片漏斗小试样的Zr-4合金疲劳寿命估算会带来很大安全余量。
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| 关 键 词： | Zr-4合金 塑性 模型 应变疲劳 有限元分析 寿命估算 |
On Strain Equivalent Method for thin Bulge-like Specimen and Low Cycle Fatigue Life Estimation Model of Zr-4 Alloy |
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| HUANG Xue-wei,CAI Li-xun.On Strain Equivalent Method for thin Bulge-like Specimen and Low Cycle Fatigue Life Estimation Model of Zr-4 Alloy[J].Laboratory Research and Exploration,2007(11). |
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| Authors: | HUANG Xue-wei CAI Li-xun |
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| Abstract: | A series of strain fatigue tests on small slice specimens with 1.3 mm thickness of Zr-4 alloy were conducted.Fatigue damage equivalent method based on the local damage equivalent assumptions between a thin Bugle-Like specimen and a straight specimen was presented.Based on the elastic-plastic finite element analysis,the equivalent conversion model of the Zr-4 alloy thin specimen from transversal strain to uniaxial strain was established.The model considers the geometrical effect and Poisson effect.With the results of the test,Manson-Coffin(M-C) model for Zr-4 alloy strain fatigue life prediction was presented.Research shows that,thin bulge-like specimen based on the equivalent conversion model can be effectively applied to low cycle fatigue tests of the thin sheet metals and their life estimation.GB recommended strain conversion formula which is applied to fatigue life prediction of thin bulge-like specimens of Zr-4 alloy would bring great security. |
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| Keywords: | Zr-4 alloy plasticity Model strain fatigue finite element analysis life estimation |
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