为了研究连续阻尼夹嵌结构复合材料(CDSSC)的弯曲疲劳特性,采用120℃共固化工艺制备了CDSSC试件并进行了静载三点弯曲试验和三点弯曲疲劳试验。在静载三点弯曲试验中,运用ANSYS数值模拟与试验结果共同求解出CDSSC外载荷与弯曲应力的线性公式;在三点弯曲疲劳试验中,采用线性公式求解出不同等级的应力水平并对CDSSC施加等效的疲劳循环载荷,试验结束后通过拟合得到CDSSC的疲劳-寿命(S-N)曲线。采用相同疲劳循环载荷研究了阻尼层厚度对CDSSC疲劳寿命的影响。结果表明:CDSSC疲劳失效的主要形式是层间滑移,且不会发生脆性断裂;疲劳寿命主要受材料中阻尼层的影响,当阻尼层厚度达到0.3mm时,疲劳寿命明显缩短,此后疲劳寿命趋于平稳;当阻尼层厚度为0.1mm时,CDSSC的疲劳性能最佳。
In order to study the bending fatigue characteristics of continuous damping sandwich composites (CDSSC),CDSSC specimens were prepared by 120℃ co-curing process,and static load three-point bending tests and three-point bending fatigue tests were carried out.In the static load three-point bending tests,a linear formula of CDSSC external load and bending stress was obtained by jointly using ANSYS numerical simulation and test results.In the three-point bending fatigue tests,the linear formula was used to solve the stress levels of different grades and the equivalent fatigue cyclic load was applied to the CDSSC.The fatigue-life (S-N) curve of the CDSSC was fitted after the test.The effect of damping layer thickness on the fatigue life of CDSSC was studied by using the same fatigue cyclic load.The results showed that the main form of fatigue failure of CDSSC was interlaminar slip and no brittle fracture.The fatigue life was mainly affected by the damping layer in the material,when the thickness of the damping layer reached 0.3mm,the fatigue life was significantly shortened,and then the fatigue life tended to be stable.When the thickness of the damping layer was 0.1mm,the fatigue performance of CDSSC was the best.
[1] 梁森,梁磊,米鹏.嵌入式共固化复合材料阻尼结构的新进展[J].应用力学学报,2010,27(4):767-772.
[2] 樊星.碳纤维复合材料的应用现状与发展趋势[J].化学工业,2019,37(4):6.
[3] 程小全,杜晓渊.纤维增强复合材料疲劳寿命预测及损伤分析模型研究进展[J].北京航空航天大学学报,2021,47(7):12.
[4] Alam P,Mamalis D,Robert C,et al.The fatigue of carbon fibre reinforced plastics—a review[J].Composites,2019,166:555-579.
[5] Kalteremidou K A,Hemelrijck D V,Pyl L.The influence of different lay-up parameters on the fatigue response of carbon/epoxy laminates under internal multiaxial stress states[J].Materials,2021,14(24):7494.
[6] Koshima S,Kajii N,Hosoi A,et al.Evaluation of static tensile strength and fatigue strength degradation of plain woven CFRP laminates under seawater immersion[J].Transactions of the JSME (in Japanese),2019,85(18):435-448.
[7] 王军,程小全,张纪奎,等.T700复合材料层合板拉-拉疲劳性能[J].航空材料学报,2012,32(3):85-90.
[8] Zhou Y,Baseer M A,Mahfuz H,et al.Statistical analysis on the fatigue strength distribution of T700 carbon fiber[J].Composites Science & Technology,2006,66(13):2100-2106.
[9] Mahmoudi A,Mohammadi B,Hosseini-Toudeshky H.Damage behaviour of laminated composites during fatigue loading[J].Fatigue & Fracture of Engineering Materials & Structures,2020,43(4):698-710.
[10] 许良,肖景厚,宋万万,等.碳纤维复合材料层合板三点弯曲疲劳性能[J].吉林大学学报,2023,52(8):1-10.
[11] GB/T 3356—2014 定向纤维增强聚合物基复合材料弯曲性能试验方法[S].北京:中国标准出版社,2014.
[12] HB 7624—1998 弯曲疲劳试验标准[S].北京:中国标准出版社,1999.
[13] 陈传尧.疲劳与断裂[M].武汉:华中科技大学出版社,2002.
[14] Ouyang N,Chen X,Chen C,et al.The very-high-cycle fatigue properties of carbon fiber composite under three-point bending[J].Journal of Physics Conference Series,2020,1622:12101.
[15] Kawai M,Takeuchi H,Taketa I,et al.Effects of temperature and stress ratio on fatigue life of injection molded short carbon fiber-reinforced polyamide composite[J].Composites Part A:Applied Science & Manufacturing,2017,98:9-24.
[16] 拓宏亮,吴涛,卢智先,等.复合材料层合板疲劳寿命预测方法研究[J].西北工业大学学报,2022,40(3):651-660.
[17] 鞠录岩.纤维增强复合材料损伤研究综述[J].冶金与材料,2020,40(3):2.
[18] 贺婷,杨长浩,许宗超,等.不同工况下纤维/天然橡胶复合材料界面疲劳失效机制[J].弹性体,2022,32(5):7.
[19] 王德,金平,刘鹏,等.基于刚度退化的复合材料层合板疲劳损伤模型的研究进展[J].材料导报,2012,26(23):4.
[20] 李雪.嵌入式共固化阻尼复合材料结构力学性能研究[D].青岛:青岛理工大学,2015.
基金资助
国家自然科学基金(52075280);山东省自然科学基金(ZR2019MEE088)
PDF
