锻压技术

巨型压机C型机架的尺寸系数计算

英文标题：Size coefficient calculation of C type frame for huge pressure machine

作者：黄宁杨建湘

单位：贺州学院

关键词：巨型压机 C型机架缺口试样尺寸系数 The Critical Distance理论有限元

分类号：

出版年,卷(期):页码：2016,41(7):67-72

摘要：

为了获取巨型压机C型机架的尺寸系数，基于TCD(The Critical Distance)理论给出了缺口试样尺寸系数的有限元计算方法。首先，利用精确的有限元分析结果，获取缺口周围的应力场模型，结合材料的疲劳性能参数得出缺口试样尺寸系数；其次，运用该方法计算一系列比例放大后的缺口试样尺寸系数，同时制作出相应的几何试样并进行试验测试其尺寸系数，通过公式计算值与试验测试值的比较证实该方法的有效性。最后，根据疲劳模拟实验原理建立C型机架模拟缩比模型，利用缺口试样尺寸系数计算方法得到压机机架的尺寸系数。该方法为大型结构件的尺寸系数计算提供参考依据。

In order to calculate size coefficient of C type frame for huge pressure machine, the finite element method (FEM) of the notched-specimen size coefficient was proposed based on TCD (The Critical Distance) theory. Firstly, the stress field model was obtained by finite element analysis, and the size coefficient of notched-specimen could be easily calculated combining the parameters of fatigue properties of the material. Secondly, a series of size coefficient of notched-specimen were calculated by the above method, and corresponding geometry specimens were made. Furthermore, their size coefficients were tested, and the validity of this method was verified by comparing the calculated value with the tested value. Finally, the simulated-scaled model of C type frame was built according to the principle of fatigue simulation experiments, and its size coefficient of pressure machine frame was calculated by the above method. This method provides the reference for size coefficient calculation of large-scaled structure components.

基金项目：

贺州学院博士基金启动项目（HZUBS201303）；贺州市科技开发项目（贺科能1408013）；广西高校科研项目（KY2015ZD128）

黄宁（1974-），男，博士，讲师

参考文献：

[1]Zheng J Y, Wu L L, Shi J F. Extreme pressure equipments[J]. Chinese Journal of Mechanical Engineering, 2011, 24(2): 202-206.

[2]张小丽,陈雪峰,李兵,等. 机械重大装备寿命预测综述[J]. 机械工程学报, 2011, 47(11): 100-116.

Zhang X L, Chen X F, Li B, et al. Review of life prediction for mechanical major equipments[J]. Chinese Journal of Mechanical Engineering, 2011, 47(11): 100-116.

[3]黄宁. 大型结构件的疲劳寿命预测方法研究[D]. 长沙: 中南大学, 2012.

Huang N. Research on Fatigue Life Prediction Methods for Large-scale Components[D]. Changsha: Central South University, 2012.

[4]奚蔚,姚卫星. 一种考虑尺寸效应的缺口件疲劳寿命预测方法[J]. 南京航空航天大学学报,2013,45(4): 497-502.

Xi W,Yao W X. Method for fatigue life prediction of notched specimen considering size effect[J]. Journal of Nanjing University of Aeronautics & Astronautics,2013,45(4): 497-502.

[5]黄宁, 黄明辉, 湛利华. 新的缺口试样尺寸系数经验公式[J]. 华南理工大学学报:自然科学版, 2012, 40(12): 35-40.

Huang N, Huang M H, Zhan L H. New empirical formula of size coefficient of notched samples[J]. Journal of South China University of Technology:Natural Science Edition, 2012, 40(12): 35-40.

[6]姚卫星. 结构疲劳寿命分析[M]. 北京: 国防工业出版社, 2003.

Yao W X. Fatigue Life Prediction of Structures [M]. Beijing: National Defense Industry Press, 2003.

[7]David Taylor. Analysis of fatigue failures in components using the theory of critical distances[J]. Engineering Failure Analysis, 2005,12: 906-914.

[8]赵思聪,谢季佳,武晓雷.含表面梯度强化层的缺口样品疲劳起源寿命数值分析[J].中国科学:物理学、力学、天文学, 2013,44(7): 737–745.

Zhao S C, Xie J J, Wu X L. Numerical simulation of fatigue initiation life for notched specimens with gradient surface layer[J]. Sci. Sin.-Phys.,Mech.,Astron., 2013, 44(7): 737-745.

[9]Luca Susmel. The theory of critical distances: A review of its applications in fatigue [J] . Engineering Fracture Mechanics, 2008,75:1706-1724.

[10]David Taylor, Saeid Kasiri. A comparison of critical distance methods for fracture prediction[J]. International Journal of Mechanical Sciences, 2008, 50: 1075-1081.

[11]Filippi S, Lazzarin P, Tovo R. Developments of some explicit formulas useful to describe elastic stress fields ahead of notches in plates[J]. International Journal of Solids and Structures, 2002, 39: 4543–4565.

[12]Kujawski D, Shin C S. On the elastic longitudnal stress estimation in the neighbourhood of notches[J]. Engineering Fracture Mechanics, 1997, 55(1): 137-138.

[13]陈耀明. 评价及估算切口疲劳强度的新方法[M]. 北京:航空工业出版社,2006.

Chen Y M. A New Method of Evaluating and Estimating Notch Fatigue Strength[M]. Beijing: Aviation Industry Press, 2006.

[14]Atzori B, Meneghetti G, Susmel L. Material fatigue properties for assessing mechanical components weakened by notches and defects[J]. Fatigue & Fracture Engineering Materials & Structure, 2004, 28: 83-97.

[15]林志忠.金属的缺陷、载荷与疲劳[M]. 北京:中国铁道出版社,1993.

Lin Z Z. Deficiency, Load and Fatigue of Metals[M]. Beijing: China Railway Press, 1993.

[16]Yves Verrman, Nathalie Limodin. Fatigue notch factor and short crack propagation[J]. Engineering Fracture Mechanics, 2008,75: 1320-1335.

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