摘要
由于平纹机织复合材料修补结构对冲击荷载下产生的响应具有多尺度的影响,采用多尺度方法建立数值分析模型,对平纹机织和单向铺层复合材料修补结构冲击响应间的差异进行研究;同时,对不同冲击能量下平纹机织复合材料修补结构的损伤演化和补片形状对结构抗冲击性能的影响也开展了研究。通过建立纤维束微观和代表性单元(representative volume element,RVE)细观模型,预测细观材料性能,进一步采用局部均匀化方法得到平纹机织复材的宏观交叉层合板等效模型(Equivalent cross-ply laminate,ECPL),完成修补结构多尺度抗冲击损伤性能分析模型构建;利用连续损伤力学模型和三维Hashin准则对冲击过程中修补结构损伤演化进行分析,并通过落锤冲击试验力和能量曲线验证了数值模型的准确性。数值和试验结果表明:平纹机织修补结构较单向层合板修补结构具有更好的抗冲击性能;其冲击损伤主要沿着0/90方向分布,随着冲击能量的提高,主要承力部位由补片转移到母板;当冲击能量达到12 J时,胶层开始出现失效脱落现象;圆形补片修补的平纹机织结构具有更好的抗冲击性能。
Here,because plain woven composite patching structure has multi-scale effect on its response under impact load,the multi-scale method was used to establish a numerical analysis model to study difference between impact responses of plain wovencomposite patching structure and unidirectional laminated one.At the same time,damage evolution of plain woven composite patching structure under different impact energy and effects of patch shape on anti-impact performancewere also studied.Through establishing fiber bundle microcosmic model and Representative volume element(RVE)meso model,meso material properties were predicted.Equivalent cross ply laminate(ECPL)model of plain wovencomposites was further obtained by using the local homogenization method,and constructing the multi-scale anti-impact damage performance analysis model of patching structure was completed.The continuous damage mechanic model and 3-DHashin criterion were used to analyze damage evolution of patching structure in impact process.The correctness of its numerical model was verified with dropping hammer impact test force and energy curve.The numerical and test results showedthat the plain woven composite patching structure has better anti-impact performance than unidirectional laminate patching structure does;its impact damage is mainly distributed along the 0/90 direction;with increase in impact energy,main load-bearing positions are transferred from patch to motherboard;when impact energy reaches 12 J,adhesive layer begins to fall off;the plain woven structure repaired with circular patch has better anti-impact performance.
作者
皮晓璠
铁瑛
胡明浩
PI Xiaofan;TIE Ying;HU Minghao(College of Mechanical and Power Engineering,Zhenzhou University,Zhengzhou 450001,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第19期188-197,共10页
Journal of Vibration and Shock
基金
国家自科基金民航联合基金(U1833116)
国家自科基金面上基金(52175153)。
