利用电子万能试验机和分离式Hopkinson压杆研究了乙烯基酯树脂浇铸体在准静态和高应变率下的压缩特性,考察了试样压缩失稳和破坏的形貌.结果表明: 在准静态加载下(应变率为3.3×10-4/s～6.6×10-3/s),材料呈韧性破坏,失稳应力、失稳应变能密度均随应变率的提高而提高,失稳应变随应变率的提高而降低; 在高应变率下(应变率为950/s～5800/s),材料呈脆性破坏,失稳应力、失稳应变能密度均随应变率的提高呈增加趋势,而失稳应变也随应变率的提高而提高,这与准静态不同,表明在高应变率下,材料发生了"强迫高弹形变".观察试样失稳和破坏后的形貌可以发现,试样的破坏在失稳前正应力起主导作用,失稳后切应力起主导作用,使试样产生裂纹进而造成宏观破坏; 乙烯基酯树脂内部损伤的演化,也依赖于应变和应变率.
参考文献
| [1] | Gama B A,Gillespie J W,Mahfuz H,et al.High strain-rate behavior of plain-weave S2 glass/vinyl ester composites[J].Journal of Composite Materials,2001,35(13):1201-1228. |
| [2] | Akil O,Yildirim U,Güden M,Hall I W.Effect of strain rate on the compression behavior of a woven fabric S2-glass fiber reinforced vinyl ester composite[J].Polymer Testing,2003,22(8):883-887. |
| [3] | 许爱荣,刘元镛.一种改性BMI中高温和动态力学性能试验研究及本构方程的建立[J].高分子材料科学与工程,2001,17(3):114-117.Xu Airong,Liu Yuanyong.The study of mechanical properties and constructive equation for bismaleimide modified by O,O′-dially phen A[J].Polymer Materials Science and Engineering,2001,17(3):114-117. |
| [4] | 蒋邦海,张若棋.动态压缩下一种碳纤维织物增强复合材料的各向异性力学性能实验研究[J].复合材料学报,2005,22(2):109-115.Jiang Banghai,Zhang Ruoqi.Dynamic compressive mechanical properties of a carbon fiber woven reinforced composite:Experimental study[J].Acta Materiae Compositae Sinica,2005,22(2):109-115. |
| [5] | Bing Qida,Sun C T.Modeling and testing strain rate-dependent compressive strength of carbon/epoxy composites[J].Composites Science and Technology,2005,65(15/16):2481-2491. |
| [6] | Sun Baozhong,Liu Fang,Gu Bohong.Influence of the strain rate on the uniaxial tensile behavior of 4-step 3D braided composites[J].Composites Part A:Applied Science and Manufacturing,2005,36(11):1477-1485. |
| [7] | Wang W,Makarov G,Shenoi R A.An analytical model for assessing strain rate sensitivity of unidirectional composite laminates[J].Composite Structures,2005,69(1):45-54. |
| [8] | Majzoobi G H,Saniee F F,Bahrami M.A tensile impact apparatus for characterization of fibrous composites at high strain rates[J].Journal of Materials Processing Technology,2005,162/163:76-82. |
| [9] | 熊杰,萧庆亮,刘冠峰.高强高模聚乙烯纤维力学性能的应变率和温度效应[J].复合材料学报,2003,20(6):104-108.Xiong Jie,Xiao Qingliang,Liu Guanfeng.Strain rate and temperature of mechanical properties of high strength and high-modulus polyethylene fiber yarns[J].Acta Materiae Compo-sitae Sinica,2003,20(6):104-108. |
| [10] | 熊杰,施楣梧.高应变率下芳纶纤维力学性能的研究[J].纺织学报,2000,21(6):335-338.Xiong Jie,Shi Meiwu.The high strain rate properties of aramid fiber[J].Journal of Textile Research,2000,21(6):335-338. |
| [11] | 熊杰,王家俊,施楣梧,王善元.高聚物纤维材料的高应变率响应行为研究[J].高分子材料科学与工程,2002,18(5):143-147.Xiong Jie,Wang Jiajun,Shi Meiwu,Wang Shanyuan.The high strain rate properties of fiber materials[J].Polymer Materials Science & Engineering,2002,18(5):143-147. |
| [12] | 徐明利,张若棋,王悟,等.波形整形器在酚醛树脂在霍普金森压杆实验中的应用[J].爆炸与冲击,2002,22(4):377-380.Xu Mingli,Zhang Ruoqi,Wang Wu,et al.Application of wave shaper in SHPB experimental study of phenolic resin[J].Explosion and Shock Waves,2002,22(4):377-380. |
| [13] | 谢辅洲,陈晓军,贾志涛,王君.环氧树脂/蒙脱土纳米复合材料的动态力学性能研究[J].玻璃钢/复合材料,2005(4):3-5.Xie Fuzhou,Chen Xiaojun,Jia Zhitao,Wang Jun.Study on dynamic mechanical behaviors of epoxy/clay nanocomposites[J].FRP/Composites,2005(4):3-5. |
| [14] | 周风华,王礼立,胡适胜.有机玻璃在高应变率下的损伤型非线性粘弹性本构关系及破坏准则[J].爆炸与冲击,1992,12(4):333-342.Zhou Fenghua,Wang Lili,Hu Shisheng.The damage criterion and non-linear viscoelasticity construction of PMMA under high strain rate[J].Explosion and Shock Waves,1992,12(4):333-342. |
| [15] | 吴其晔,冯莺.高分子材料概论[M].北京:机械工业出版社,2004:133-142.Wu Qiye,Feng Ying.Polymer material introduction[M].Beijing:China Machine Press,2004:133-142. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%