| 湿热对单向复合材料层板断裂韧性及疲劳裂纹扩展的影响 |
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| 引用本文： | 张复盛 普林.,R.湿热对单向复合材料层板断裂韧性及疲劳裂纹扩展的影响[J].北京航空航天大学学报,1993(2):7-15. |
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| 作者姓名： | 张复盛 普林. R |
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| 作者单位： | 北京航空航天大学材料科学与工程系
(张复盛)，德国航空航天研究实验院
(普林茨R)，德国航空航天研究实验院(崔希JH) |
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| 摘 要： | 就湿热(70℃,相对湿度RH100％)环境对T300/914C石墨/环氧单向复合材料层板层间断裂韧性的影响进行了研究。用扫描电镜对断口形貌进行观察,不论是湿热处理的或是室温放置和经干燥处理的,断口形貌无明显差异。我们还对上述DCB试样在交变载荷作用下裂纹的扩展行为进行了研究。找出了裂纹扩展速率da/dN与最大循环应变能释放率G_(Imax)关系式da/dN=A·G_(Imax)~B中的A和B两个常数的数值。经湿热处理的DCB试样疲劳裂纹扩展速率与干燥试样相比有所降低。我们分别用断口形貌、断裂机理和断裂力学原理分析了湿热环境对复合材料性能的影响。
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| 关 键 词： | 石墨 环氧 复合材料 断裂韧性 |
MOISTURE-HEAT EFFECTS ON UNIDIRECTIONAL COMPOSITE LAMINATES FRACTURE TOUGHNESS AND FATIGUE CRACK GROWTH |
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| Zhang Fusheng Pzinz R Zichy J H.MOISTURE-HEAT EFFECTS ON UNIDIRECTIONAL COMPOSITE LAMINATES FRACTURE TOUGHNESS AND FATIGUE CRACK GROWTH[J].Journal of Beijing University of Aeronautics and Astronautics,1993(2):7-15. |
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| Authors: | Zhang Fusheng Pzinz R Zichy J H |
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| Institution: | Zhang Fusheng Pzinz R Zichy J H(Dept. of Mater. Sci. and Eng. ) (German Aerospace Research Establishment) |
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| Abstract: | The heat-moisture effect on interlaminar fracture toughness of T300/914C graphite/e-poxy unidirectional composite laminates is investigated under mode I opening loading with DCB specimen. The fracture toughness in moisture-heat conditioning increases and the glass transition temperature decreases. SEM fractographs revealed no discernible difference in the fracture surface mophlogy of moisture-heat and dry conditioned specimen. No fiber bridging occurs in the testing.Delamination fatigue crack growth experiments are carried out on T300/914C graphite/ epoxy unidirectional laminates. It is found that the mode 1 cyclic crack growth rate yields a power low relationship between da/dN and the maximum cyclic strain energy release rate. The crack growth rate of the moisture-heat conditioned specimen is lower than the dry conditioned. The environmental effects are explained on the basis of fractography and fracture mechanisms and fracture mechanics. |
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| Keywords: | graphite epoxy composite fracture toughness moisture heat effect |
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