CLAM钢断裂韧性数据的规则化处理研究
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摘要
目的利用规则化法对CLAM钢(中国低活化马氏体钢)的断裂韧性数据进行处理,获得其断裂韧性。方法采用基于载荷分离理论的规则化法,对CLAM钢卸载柔度法得到的原始载荷(P)、COD(裂纹张开位移)数据进行规则化处理。首先去除卸载柔度法采集的加载和卸载(Unload/Reload)、裂纹扩展(Extend Crack)数据,只保留加载过程中Ramp数据。然后将提取出来的Load-COD数据采用载荷分离的规则化法进行处理得到(J,Δa)数据,从而得到J-R阻力曲线及断裂韧性条件判定值J_Q。结果得到CLAM钢平均断裂韧性J_Q为178 MPa·mm,所有试样厚度(B)及初始裂纹长度(b_0)均大于10J_Q/σ_Y。结论规则化法处理的CLAM钢断裂韧性J_Q满足有效性判定条件。
The paper aims to process the fracture toughness data of CLAM steel(China low activation martensitic steel) with the normalization method to obtain its fracture toughness. The original data of CLAM steel Load(P) and COD(Crack Open Displacement) obtained by unloading compliance method were processed with the normalization method based on the load separation theory. Firstly, the Unload/Reload and Extend Crack data collected with unloading compliance method were removed, and only the Ramp data during the loading process were retained. Then, the extracted Load-COD data were processed with the normalization method to obtain(J, Δa) data, and obtain the J-R resistance curve and the condition fracture toughness J_Q. The average fracture toughness J_Q of the CLAM steel was 178 MPa·mm. The thickness(B) and the initial crack length(b_0) of all specimens were greater than 10 J_Q/σ_Y. The fracture toughness J_Q of the CLAM steel obtained with the normalization method satisfies the validity judgment condition.
The paper aims to process the fracture toughness data of CLAM steel(China low activation martensitic steel) with the normalization method to obtain its fracture toughness. The original data of CLAM steel Load(P) and COD(Crack Open Displacement) obtained by unloading compliance method were processed with the normalization method based on the load separation theory. Firstly, the Unload/Reload and Extend Crack data collected with unloading compliance method were removed, and only the Ramp data during the loading process were retained. Then, the extracted Load-COD data were processed with the normalization method to obtain(J, Δa) data, and obtain the J-R resistance curve and the condition fracture toughness J_Q. The average fracture toughness J_Q of the CLAM steel was 178 MPa·mm. The thickness(B) and the initial crack length(b_0) of all specimens were greater than 10 J_Q/σ_Y. The fracture toughness J_Q of the CLAM steel obtained with the normalization method satisfies the validity judgment condition.
引文
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[2]赵飞,万奎贝,乔建生,等.低活化马氏体钢的微观结构与力学性能[J].核科学与工程,2007,27(1):59-63.ZHAO Fei,WAN Kui-bei,QIAO Jian-sheng,et al.The Microstructure and Mechanical Properties of China Low Activation Martensitic Steel[J].Nuclear Science and Engineering,2007,27(1):59-63.
[3]黄群英,李春京,李艳芬,等.中国低活化马氏体钢CLAM研究进展[J].核科学与工程,2007,27(1):41-50.HUANG Qun-ying,LI Chun-jing,LI Yan-fen,et al.R&D Status of China Low Activation Martensitic Steel[J].Journal of Nuclear Science and Engineering,2007,27(1):41-50.
[4]黄群英,郁金南,万发荣,等.聚变堆低活化马氏体钢的发展[J].核科学与工程,2004,24(1):56-64.HUANG Qun-ying,YU Jin-nan,WAN Fa-rong,et al.The Development of Low Activation Martensitic Steels for Fusion Reactor[J].Nuclear Science and Engineering,2004,24(1):56-64.
[5]KAREL S,JAN B,JAROSLAV B,et al.Fracture Toughness of the Hydrogen Charged EUROFER 97RAFM Steel at Room Temperature and 120℃[J].Journal of Nuclear Materials,2009,392:125-132.
[6]SOKOLOV M A,HOELZER D T,STOLLER R E,et al.Fracture Toughness and Tensile Properties of Nano-structured Ferritic Steel 12YWT[J].Journal of Nuclear Materials,2007:213-216.
[7]ZHU Xian-kui,JAMES A.J-Resistance Curve Testing of HY80 Steel Using SE(B)Specimens and Normalization Method[J].Engineering Fracture Mechanics,2007,74:2263-2281.
[8]WU Qing-sheng,ZHENG Shu-hui,LIU Shao-jun,et al.Effect of Post-weld Heat Treatment on the Mechanical Properties of Electron Beam Welded Joints for CLAMSteel[J].Journal of Nuclear Materials,2013,442:512-517.
[9]ASTM E1820-2011,Standard Test Method for Measurement of Fracture Toughness[S].
[10]LANDES J D.Application of Load Separation and Normalization Methods for Polycarbonate Materials[J].International Journal of Fracture,1993,63:383-393.
[11]VAN Der,SLUYS W A,YOUNG B A.A Sensitivity Study on A Normalization Procedure[J].Fatigue and Fracture Mechanics,ASTM STP 1406,American Society for Testing and Materials,2001:37-48.
[12]LANDES J D,HERRERA R.A New Look at J-R Curve Analysis[J].International Journal of Fracture,1988,36:9-14.
[13]MORHAIN C,VELASCO J I.Determination of J-RCurve of Polypropylene Copolymers Using the Normalization Method[J].Journal of Materials Science,2001,36:1487-1499.
[14]ZHOU Z,LEE K,HERRERA R,et al.Normalization:An Experimental Method for Developing J-R Curves[J].Elastic-Plastic Fracture Test Methods:The User's Experience(Second Volume),ASTM STP 1114,J.A.Joyce,Ed.American Society for Testing and Materials,Philadelphia,1991:42-56.
[15]田泽,孙学伟.求解予裂试件实时裂纹长度的一种新的直接法[J].实验力学,1995,10(4):377-383.TIAN Ze,SUN Xue-wei.A New Direct Method for Evaluating Current Creak Length of Precracked Specimen[J].Journal of Experimental Mechanics,1995,10(4):377-383.
[16]蔡力勋,包陈.用于延性断裂韧性测试的载荷分离方法与应用[J].北京科技大学学报,2011,33(7):868-875.CAI Li-xun,BAO Chen.Load Separation Method to Determine the Ductile Fracture Toughness of Materials and Its Application[J].Journal of University of Science and Technology Beijing,2011,33(7):868-875.