2A12铝合金弹性常数数字图像相关测试法及其参数灵敏度分析
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摘要
建立了基于三维数字图像相关(3D-DIC)的非接触光学测试系统,对2A12铝合金弹性常数进行了测试,在此基础上分析了DIC子区和步长的大小对材料弹性常数测试结果的影响,并探讨了2A12铝合金在拉伸载荷作用下的变形演化规律。结果表明:3组2A12铝合金试样测得的弹性模量和泊松比分别为66.32,67.51,63.08 GPa和0.333,0.336,0.347;改变子区大小将引起图像噪音的变化,对测试结果的影响较改变步长的影响更为明显,步长则主要作用于DIC算法的运行时间;2A12铝合金试样在整个拉伸过程中依次经过弹性变形、均匀塑性流动以及应变局部化三个阶段后发生断裂。
Non-contact optical measurement system based on three-dimensional digital image correlation( 3 D-DIC)was established to test the elastic constants of 2 A12 aluminum alloy. The effects of different sizes of DIC parameters,i. e.subset size and step size,on the elastic constant test results of the material were investigated,and the deformation evolution law of 2 A12 aluminum alloy under the action of tensile load was also discussed. The results show that the elastic modulus and Poisson ratio of three groups of 2 A12 aluminum alloy specimens were 66.32,67.51,63.08 GPa and 0.333,0.336,0.347,respectively. Changing the subset size caused the change of image noise,subset size had more influence on the test results compared to step size,and step size mainly controlled the computational time of DIC algorithm. The 2 A12 aluminum alloy specimen fractured after three stages of elastic deformation,uniform plastic flow and strain localization.
Non-contact optical measurement system based on three-dimensional digital image correlation( 3 D-DIC)was established to test the elastic constants of 2 A12 aluminum alloy. The effects of different sizes of DIC parameters,i. e.subset size and step size,on the elastic constant test results of the material were investigated,and the deformation evolution law of 2 A12 aluminum alloy under the action of tensile load was also discussed. The results show that the elastic modulus and Poisson ratio of three groups of 2 A12 aluminum alloy specimens were 66.32,67.51,63.08 GPa and 0.333,0.336,0.347,respectively. Changing the subset size caused the change of image noise,subset size had more influence on the test results compared to step size,and step size mainly controlled the computational time of DIC algorithm. The 2 A12 aluminum alloy specimen fractured after three stages of elastic deformation,uniform plastic flow and strain localization.
引文
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[2]胡浩,梁晋,唐正宗,等.数字图像相关法测量金属薄板焊接的全场变形[J].光学精密工程,2012,20(7):1636-1644.
[3]DICKINSON A,TAYLOR A,OZTURK H,et al.Experimental validation of a finite element model of the proximal femur using digital image correlation and a composite bone model[J].Journal of Biomechanical Engineering,2011,133(1):317-323.
[4]李湘萍,刘海淙.基于数学图像相关的机翼有限元模型试验验证[J].科学技术与工程,2017,17(14):97-104.
[5]郝文峰,陈新文,邓立伟,等.数字图像相关方法测量芳纶纤维复合材料I型裂纹应力强度因子[J].航空材料学报,2015,35(2):90-95.
[6]CAMINERO M A,LOPEZ-PEDROSA M,PINNA C,et al.Damage monitoring and analysis of composite laminates with an open hole and adhesively bonded repairs using digital image correlation[J].Composites:Part B,2013,53(7):76-91.
[7]白晓虹.数字图像相关(DIC)测量方法在材料变形研究中的应用[D].沈阳:东北大学,2011.
[8]胡斌,贺玲凤,张蕊.橡胶材料弹性模量数字图像相关测得法[J].实验力学,2011,26(2):151-157.
[9]ZHU F P,BAI P X,ZHANG J B,et al.Measurement of true stress-strain curves and evolution of plastic zone of low carbon steel under uniaxial tension using digital image correlation[J].Optics and Laser in Engineering,2015,65:81-88.
[10]杨峰,张德坤,石瑞虎,等.摩擦压力对2A12铝合金摩擦焊接头力学性能的影响[J].机械工程材料,2017,41(11):73-76.
[11]张胜,高潮,何宇延,等.不同厚度2A12-T4铝合金板的疲劳裂纹扩展形貌[J].机械工程材料,2016,40(6):33-36.
[12]吉建民,陈金龙,郭广平,等.应用数字图像相关方法测试航空复合材料的弹性常数[J].材料工程,2013(10):80-85.
[13]SUTTON M A,ORTEU J J,SCHREIER H W.Image correlation for shape,motion and deformation measurements:Basic concepts,theory and applications[M].New York:Springer,2009.
[14]PAN B,YUAN J Y,XIA Y.Strain field denoising for digital image correlation using a regularized cost-function[J].Optics and Lasers in Engineering,2015,65:9-17.
[15]《中国航空材料手册》编辑委员会.中国航空材料手册第3卷:铝合金镁合金[M].北京:中国标准出版社,2002.