2D-SiC/SiC复合材料损伤耦合力学行为
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摘要
基于轴向和45°偏轴加载实验,分别获得2D-SiC/SiC复合材料在单一轴向应力和复合应力状态下纤维束轴向方向上的拉伸、压缩和面内剪切应力-应变行为,计算分析材料在复合应力状态下的损伤耦合力学行为。结果表明,在45°偏轴拉伸和压缩复合应力状态下材料损伤耦合力学行为的起始应力分别约为40MPa和-100MPa。复合应力状态下材料纤维束轴向方向上的拉伸损伤和面内剪切损伤进程间具有相互促进作用,面内剪切损伤对压缩损伤进程具有促进作用,但是压缩应力分量对面内剪切损伤进程具有明显的抑制作用;上述损伤耦合作用随着应力水平的增加而越发显著。由试件断口电镜扫描结果可知,复合应力状态下材料纤维束轴向方向上3个应力分量对材料内部0°/90°和45°3种取向基体裂纹开裂损伤进程的影响作用,是2D-SiC/SiC复合材料产生损伤耦合力学行为的主要细观损伤机制。
By using axial and off-axis loading tests with off-axis angle as 45°, the tensile, compressive and in-plane shear stress-strain behaviors along the fiber bundles directions of a 2 D-SiC/SiC composite were obtained, and the damage coupling mechanical behaviors of composite under combined stress condition were studied. The results show that the initial stress levels for the damage coupling mechanical behaviors of composite under 45° off-axis tensile and compressive loading conditions are 40 MPa and-110 MPa, separately. Under combined stress conditions, there exists obvious mutual acceleration between the tensile and the in-plane shear damage evolutions in the fibre bundles directions of composite, and the in-plane shear damage has accelerative effect on the compressive damage evolution, but the in-plane shear damage evolution is suppressed by compressive stress components obviously. These coupling effects become more significant with increasing stress level. The SEM(scanning electron microscope) pictures of fractured surfaces on off-axis loading specimens indicate that, in the fiber bundles directions, the mutual effects between the three stress components and the cracking evolutions of the three kinds of matrix cracks(oriented at 0°, 90° and 45°) are the main micro-damage mechanisms for the damage coupling mechanical behaviors of 2 D-SiC/SiC composite under combined stress conditions.
By using axial and off-axis loading tests with off-axis angle as 45°, the tensile, compressive and in-plane shear stress-strain behaviors along the fiber bundles directions of a 2 D-SiC/SiC composite were obtained, and the damage coupling mechanical behaviors of composite under combined stress condition were studied. The results show that the initial stress levels for the damage coupling mechanical behaviors of composite under 45° off-axis tensile and compressive loading conditions are 40 MPa and-110 MPa, separately. Under combined stress conditions, there exists obvious mutual acceleration between the tensile and the in-plane shear damage evolutions in the fibre bundles directions of composite, and the in-plane shear damage has accelerative effect on the compressive damage evolution, but the in-plane shear damage evolution is suppressed by compressive stress components obviously. These coupling effects become more significant with increasing stress level. The SEM(scanning electron microscope) pictures of fractured surfaces on off-axis loading specimens indicate that, in the fiber bundles directions, the mutual effects between the three stress components and the cracking evolutions of the three kinds of matrix cracks(oriented at 0°, 90° and 45°) are the main micro-damage mechanisms for the damage coupling mechanical behaviors of 2 D-SiC/SiC composite under combined stress conditions.
引文
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[3] 张建艺.陶瓷基复合材料在喷管上的应用[J].宇航材料工艺,2000(4):14-16.ZHANG J Y.Ceramic matrix composite application in nozzle[J].Aerospace Materials and Technology,2000(4):14-16.
[4] GUO H B,JIA P R,WANG B,et al.Characterization and analysis of the damage coupling effects of a 2D-C/SiC composite under proportional loading conditions[J].Ceramics International,2016,42:1007-1014.
[5] YANG C P,JIAO G Q,WANG B,et al.Damage-based failure theory and its application to 2D-C/SiC composites[J].Composites:Part A,2015,77:181-187.
[6] 杨成鹏,矫桂琼,王波.2D-C/SiC复合材料的单轴拉伸力学行为及其强度[J].力学学报,2011,43(2):330-337.YANG C P,JIAO G Q,WANG B.Uniaxial tensile stress-strain behavior and strength of plain woven C/SiC composite[J].Chinese Journal of Theoretical and Applied Mechanics,2011,43(2):330-337.
[7] WANG Y Q,ZHANG L T,CHENG L F,et al.Characterization of tensile behavior of a two-dimensional woven carbon/silicon carbide composite fabricated by chemical vapor infiltration[J].Materials Science and Engineering:A,2008,497:295-300.
[8] GARLAND D B,BEYERLEIN J I,SCHADLER S L.The development of compression damage zones in fibrous composites[J].Composites Science and Technology,2001,61:2461-2480.
[9] 郭洪宝,王波,贾普荣,等.平纹编织陶瓷基复合材料面内剪切细观损伤行为研究[J].力学学报,2016,48(2):361-368.GUO H B,WANG B,JIA P R,et al.Mesoscopic damage behaviors of plain woven ceramic composite under in-plane shear loading[J].Chinese Journal of Theoretical and Applied Mechanics,2016,48(2):361-368.
[10] WANG Y Q,ZHANG L T,CHENG L F.Comparison of in-plane shear behaviors of 2D plain woven C/SiC composites[J].Ceramic-Silikaty,2012,54:26-30.
[11] 李俊,矫桂琼,王波.平纹编织C/SiC复合材料层合板面内力学性能的可设计性研究[J].机械强度,2012,34(2):229-233.LI J,JIAO G Q,WANG B.Designable in-plane mechanical property of plain-woven C/SiC composite laminate[J].Journal of Mechanical Strength,2012,34(2):229-233.
[12] 李俊.二维C/SiC复合材料非线性本构关系研究[D].西安:西北工业大学,2014.LI J.Research on the nonlinear constitutive relationship of 2D C/SiC composites[D].Xi’an:Northwestern Polytechnical University,2014.
[13] WEIGEL N,KR?PLIN B,DINKLER D.Micromechanical modeling of damage and failure mechanisms in C/C-SiC[J].Computational Materials Science,1999,16:120-132.
[14] WEIGEL N,DINKLER D,KR?PLIN B.Micromechanically based continuum damage mechanics material laws for fiber-reinforced ceramics[J].Computers and Structures,2001,79:2277-2286.
[15] BERNACHY-BARBE F,GéLéBART L,BORNERT M,et al.Anisotropic damage behavior of SiC/SiC composite tubes:multiaxial testing and damage characterization[J].Composites:Part A,2015,76:281-288.
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