|
|
- 2018
组合载荷下含缺口纤维增强树脂基复合材料的失效分析
|
Abstract:
为研究含缺口纤维增强复合材料层合板在复杂载荷下的破坏，本文采用改进的Arcan夹具，在30°方向对含缺口碳纤维增强树脂基复合材料层合板（[-45/90/45/0]s）进行了拉伸-剪切组合加载实验。用数字图像相关方法（DICM）测量了层合板表面层的裂纹发展过程，在缺口尖端观察到了明显的劈裂现象。然后用有限元软件ABAQUS建立了三维层合板模型，为准确模拟裂纹尖端的应力场，模型中每层引入内聚力接触来模拟劈裂。为了比较加载端的转动自由度对层合板失效模式和破坏强度的影响，文中分析了两种不同的边界条件，即约束和放松加载端的转动自由度。研究结果发现，加载端的合力方向主导了层合板的失效模式和破坏强度，放松加载端自由度的模拟结果与实验结果有很好的一致性。 A modified Arcan fixture was used in this paper to study the damage of notched fiber reinforced compo-sites under complex loading.Notched carbon-fiber reinforced composite specimens([-45/90/45/0]s) were tested under combined tension and shear loading by stretching along 30°direction.The development of cracking in the surface ply of the laminates was measured by the digital image correlation method (DICM), and obvious splitting phenomena is observed at the notch tips. Afterwards a 3D laminate model was developed by finite element software ABAQUS. To capture the true stress concentration at the notch tips, cohesive contact zones were introduced in the model to simulate the splitting in each ply.In order to clarify the effect of rotational degree of freedom at the loading ends on the failure mechanisms and strengths of the laminates, two different boundary conditions were studied, i.e. constraining or relaxing the rotational degree of freedom.The result shows that the direction of resultant force dominates the failure mechanisms and strengths of the laminates. The simulation results with relaxed rotational degree of freedom are in good agreement with the experiments.
| [1] | HALLETT S R, GREEN B G, JIANG W G, et al. An experimental and numerical investigation into the damage mechanisms in notched composites[J]. Composites Part A:Applied Science & Manufacturing, 2009, 40(5):613-624. |
| [2] | SOUTIS C, CURTIS P T, FLECK N A. Compressive failure of notched carbon fiber composites[J]. Mathematical and Physical Sciences, 1993, 440(1909):241-256. |
| [3] | WALRATH D E, ADAMS D F. Analysis of the stress state in an iosipescus hear test specimen[R]. Wyoming:University of Wyoming, 1983. |
| [4] | TAN J L Y, DESHPANDE V S, FLECK N A. Failure mechanisms of a notched CFRP laminate under multi-axial loading[J]. Composites Part A:Applied Science & Manufacturing, 2015, 77:56-66. |
| [5] | BAO H C, LIU G Y. Progressive failure on scaled open-hole tensile composite laminates[J]. Composite Structures, 2016, 150:173-180. |
| [6] | HASHIN Z. Failure criteria for unidirectional fiber compo-sites[J]. Journal of Applied Mechanics, 1980, 47(2):329-334. |
| [7] | 沈观林, 胡更开, 刘彬. 复合材料力学[M]. 第2版. 北京:清华大学出版社, 2013:16-28. SHEN G L, HU G K, LIU B. Mechanics of composite materials[M]. 2nd ed. Beijing:TsinghuaUniversity Press, 2013:16-28(in Chinese). |
| [8] | AWERBUCH J, MADHUKAR M S. Notched strength of composite laminates:Predictions and experiments-A review[J]. Journal of Reinforced Plastics and Composites, 1985, 4(1):3-159. |
| [9] | GREEN B G, WISNOM M R, HALLETT S R. An experimental investigation into the tensile strength scaling of notched composites[J]. Composites Part A:Applied Science and Manufacturing, 2007, 38(3):867-878. |
| [10] | CHOW C L, XIAN X J, LAM J. Experimental investigation and modelling of damage evolution/propagation in carbon/epoxy laminated composites[J]. Composites Science and Technology, 1990, 39(2):159-184. |
| [11] | BISHOP S M. The mechanical performance and impact behaviour of carbon-fiber reinforced PEEK[J]. Composite Structures, 1985, 3(3-4):295-318. |
| [12] | KORTSCHOT M T, BEAUMONT P W R. Damage mechanics of composite materials:I-Measurements of damage and strength[J]. Composites Science and Technology, 1990, 39(4):289-301. |
| [13] | ARCAN M, HASHIN Z, VOLOSHIN A. A method to produce uniform plane stress states with applications to fiber-reinforced materials[J]. Experimental Mechanics, 1978, 18(4):141-146. |
| [14] | CHANG F K, CHANG K Y. A progressive damage model for laminated composites containing stress concentrations[J]. Journal of Composite Materials, 1987, 21(9):834-855. |
| [15] | CHANG F K, LESSARD L B. Damage tolerance of laminated composites containing an open hole and subjected to compressive loadings:I-Analysis[J]. Journal of Composite Materials, 1991, 25(1):2-43. |
| [16] | 李秋漳, 姚卫星, 陈方. 复合材料层合板缺口强度的CDM三维数值模型[J]. 复合材料学报, 2016, 33(12):2766-2774. LI Q Z, YAO W X, CHEN F. CDM three-dimensional numerical model for notched strength of composite laminate[J]. Acta Materiae Compositae Sinica, 2016, 33(12):2766-2774(in Chinese). |
| [17] | 崔海波, 张阿龙. 含圆孔复合材料层合板在拉伸载荷下的破坏机理[J]. 机械工程材料, 2015, 39(6):99-104. CUI H B, ZHANG A L. Damage mechanism of composite laminates with a circular hole under tensile loading[J]. Materials for Mechanical Engineering, 2015, 39(6):99-104(in Chinese). |
| [18] | 鲍宏琛, 刘广彦. 准各向同性复合材料层合板的开孔拉伸破坏模拟[J]. 复合材料学报, 2016, 33(5):1026-1032. BAO H C, LIU G Y. Simulation on damage in quasi-isotropic composite laminates under open-hole tension[J]. Acta Materiae Compositae Sinica, 2016, 33(5):1026-1032(in Chinese). |
| [19] | 鲍宏琛, 刘广彦. 纤维增强复合材料层合板缺口尺寸及形状效应数值模拟[J]. 复合材料学报, 2017, 34(5):987-995. BAO H C, LIU G Y. Numerical simulation on notch size and shape effects of fiber-reinforced composite laminates[J]. Acta Materiae Compositae Sinica, 2017, 34(5):987-995(in Chinese). |
| [20] | 许明明. 碳纤维增强金属层合板抗冲击特性研究[D]. 北京:北京理工大学, 2016. XU M M. High velocity impact resistance of carbon fiber-reinforced mental laminates[D]. Beijing:Beijing Institute of Technology, 2016(in Chinese). |
