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1. 浙江工业大学 机械工程学院, 浙江 杭州 310023
2. 浙江工业大学 特种装备制造与先进加工技术教育部重点实验室, 浙江 杭州 310023
Received:11 March 2022,
Published Online:19 July 2023,
Published:31 May 2023
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Xiaofeng SHAN, Hongli GAO, Xinwei HUANG, et al. Evolution Law of Deformation Field of Short Crack Tip under High-Frequency Resonant Loading Using a Microscope DIC System[J]. Acta Armamentarii, 2023, 44(5): 1482-1492.
Xiaofeng SHAN, Hongli GAO, Xinwei HUANG, et al. Evolution Law of Deformation Field of Short Crack Tip under High-Frequency Resonant Loading Using a Microscope DIC System[J]. Acta Armamentarii, 2023, 44(5): 1482-1492. DOI: 10.12382/bgxb.2022.0153.
为研究疲劳短裂纹扩展机理
提出一种基于显微数字图像相关(DIC)的塑性金属材料谐振疲劳短裂纹尖端位移场、应变场和塑性区的测量方法
并对其演化规律进行研究。通过显微摄像系统采集疲劳裂纹扩展过程中谐振载荷最大点试件短裂纹图像;采用DIC方法获得裂纹尖端区域位移场和应变场的数据。通过虚拟引伸计技术结合位移场演化数据获得短裂纹扩展过程中裂纹尖端坐标
进而根据von Mises屈服准则和应变场数据确定裂纹尖端塑性区尺寸及演化规律并与Irwin模型的理论尺寸进行对比验证;采用电子背散射衍射(EBSD)技术测量典型塑性金属材料316不锈钢疲劳裂纹尖端的晶粒尺寸分布
进一步研究谐振载荷作用下疲劳短裂纹尖端区域沿晶粒尺度的位移和应变的演化规律。研究结果表明:提出的方法成功获取了短裂纹微米级变形场演化数据
为塑性金属材料疲劳短裂纹扩展特性的进一步研究和疲劳寿命预测提供了实验和理论支持。
To study the propagation mechanism of short fatigue cracks
a method is proposed to measure the displacement field
strain field
and plastic zone of the short crack tip of plastic metal materials under high-frequency resonant loading using microscope Digital Image Correlation (micro-DIC). And the evolution law of the displacement field
strain field
and plastic zone are studied. First
short crack images of the specimen under maximum resonant loading during fatigue crack growth (FCG) are collected by a microscope camera system. Second
data of the displacement field and strain field at the crack tip region are obtained using the DIC method. Third
the coordinates of the crack tip during short crack propagation are obtained by the virtual extensometer along with the displacement field evolution data. Then
based on the von Mises yield criterion and strain field data
evolution law of the size of the plastic zone is studied and compared with the Irwin model. Last
grain size distribution on the crack tip of 316 stainless steel
a typical plastic metal material
is measured by EBSD technology. The evolution law of displacement and strain along the grain scale in the short crack tip region under high-frequency resonant loading is further studied. The research results show that the proposed method can successfully obtain the micron-scale deformation field evolution data of short cracks
providing experimental and theoretical support for further examination of short fatigue cracks and fatigue life prediction of plastic metal materials under high-frequency resonant loading.
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周金宇 , 谢里阳 , 朱福先 , 等 . 疲劳裂纹形核寿命的细观概率模型 [J ] . 兵工学报 , 2016 , 37 ( 2 ): 307 - 316 . DOI: 10.3969/j.issn.1000-1093.2016.02.017 http://doi.org/10.3969/j.issn.1000-1093.2016.02.017 裂纹形核是结构疲劳损伤演化的初级阶段。基于Tanaka-Mura微裂纹形核机制,提出恒幅交变载荷下结构表面疲劳裂纹形核寿命的细观概率模型。设细观尺度的晶粒尺寸、晶粒取向欧拉角为随机变量,借助Schmidt因子建立细观主应力与分解切应力之间的关系。考虑到晶粒取向随机性和紧邻晶粒影响因素,导出分解切应力变程的概率分布。进一步运用矩法和次序统计量模型获得任一晶粒中疲劳裂纹形核寿命和结构热区晶粒群多裂纹分散形核寿命的概率分布。数值算例验证了所提模型与方法的可行性和合理性。新模型在裂纹形核寿命研究中引入了细观物理参数和几何参数的概率统计信息,可为多晶体金属结构件的疲劳可靠性评估和抗疲劳概率设计开辟精细化分析的新途径。
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杨冰 , JAMES M N , 基于CJP模型的疲劳裂纹扩展率曲线及应用方法 [J ] . 机械工程学报 , 2018 , 54 ( 18 ): 76 - 84 . DOI: 10.3901/JME.2018.18.076 http://doi.org/10.3901/JME.2018.18.076 利用数字图像相关技术开展工业纯钛5种不同高宽比CT试样的疲劳裂纹扩展率试验,分别采用传统应力强度因子范围&Delta;K和基于CJP模型理论框架的新应力强度因子范围&Delta;K<sub>CJP</sub>对数据进行分析,得到的da/dN-&Delta;K和da/dN-&Delta;K<sub>CJP</sub>曲线均有效反映了试验数据分布规律,具有良好的拟合效果。相较于传统参量&Delta;K,&Delta;K<sub>CJP</sub>直接由裂尖位移场求解,无需进行修正即可用于材料疲劳裂纹扩展率描述,具有与CT试样高宽比无关的特性;作为&Delta;K<sub>CJP</sub>的两个组成参量,&Delta;K<sub>F</sub>、&Delta;K<sub>R</sub>与传统&Delta;K数据间均呈现出某种总体变化趋势,分别可用二次多项式和线性方程表征。构造了&Delta;K<sub>CJP</sub>与&Delta;K的关联函数,并由此推导出&Delta;K<sub>CJP</sub>表达式,为da/dN-&Delta;K<sub>CJP</sub>曲线在材料与结构的失效分析和安全评价中的应用提供了有效途径,拓宽了CJP模型的工程应用范围。
YANG B , JAMES M N . Fatigue crack growth rate curve based on the CJP model and its application method [J ] . Journal of Mechanical Engineering , 2018 , 54 ( 18 ): 76 - 84 . (in Chinese) DOI: 10.3901/JME.2018.18.076 http://doi.org/10.3901/JME.2018.18.076 Fatigue crack growth rate tests of commercial pure titanium specimens with 5 different height-width ratios of CT specimens using the digital imagine correlation technique are carried out. The traditional stress intensity factor range, &Delta;<em>K</em>, and the new definition of the stress intensity factor range, &Delta;<em>K</em><sub>CJP</sub>, which is under the theory of the CJP model, are utilized in the analysis of the test data. Both the d<em>a</em>/d<em>N</em>-&Delta;<em>K</em> curve and the d<em>a</em>/d<em>N</em>-&Delta;<em>K</em><sub>CJP</sub> curve reflect the distribution of the test data effectively and show good fitting effects. Compared to the traditional &Delta;<em>K</em>, the &Delta;<em>K</em><sub>CJP</sub> is obtained directly from the displacement fields near the crack tip and can be utilized without correction, and has a characteristic of height-width ratio-independent for CT specimens. Furthermore, as two component parameters of &Delta;<em>K</em><sub>CJP</sub>, both &Delta;<em>K</em><sub>F</sub> and &Delta;<em>K</em><sub>R</sub> show some certain general change trends with the traditional &Delta;<em>K</em>, which can be described by using the quadratic polynomial and the linear equation respectively. Based on this, a correlation curve is constructed to determine the expression of &Delta;<em>K</em><sub>CJP</sub>. Thus, an effective approach is established for using the d<em>a</em>/d<em>N</em>-&Delta;<em>K</em><sub>CJP</sub> curve in the failure analysis and the safety assessment of materials and structures, which extends the engineering applications of the CJP model.
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