摘要
为实现三维结构复合材料的高质量成形,研究了复合材料柔性导向三维多针织造成形过程中导向阵列的变形特征。利用导向阵列边缘导向棒的中心距变化情况进行导向阵列变形特征研究,主要采用图像处理手段对中心距大小进行分析,从而获得不同织物高度条件下导向阵列中心距的变化特征,并对成形后复合材料预制体的成形精度和内部质量进行分析,建立了具有微变形的导向棒压实协调变形模型,探究导向阵列变形对预制体成形质量的影响。基于复合材料柔性导向三维多针织造成形工艺,导向阵列边缘导向棒中心距整体呈高斯分布,导向阵列变形的主要原因是导向棒自身的变形,且随织造过程进行,导向棒变形加剧。在进行导向棒选择和布置时,应选择初始变形小于1.4mm,变形区幅宽与变形区中心高度之比大于0.845的导向棒,有利于减小导向阵列变形情况,避免成形过程使导向棒进一步变形的可能。
In order to realize the high-quality forming of three-dimensional composite materials,the deformation characteristics of the guide array in the forming process of flexible guiding three-dimensional multi-weaving of composite materials are studied by the center distance of the edge guide bars of the guide array.The variation of the center distance of the guide array of different height is obtained by using the image processing method.A compacted deformation model of the guide bar with micro-deformation was established.The forming accuracy and internal quality of the preform are analyzed to inquiry the influence of the deformation of the guided array on the forming quality of the preform.It is found that the preform formed by the flexible guide three-dimensional multiweaving forming process has good dimensional accuracy and internal structure uniformity.The center distance of the guide array shows Gauss distribution.The main reason of the deformation of the guide array is the deformation of the guide bar which intensifies during the weaving process.When selecting and arranging the guide bar,the guide bars with the initial deformation of less than 1.4 mm and the ratio of the width of the deformation area to the height of the deformation area from the base plate bigger than 0.845 should be selected.The chosen guide bars were beneficial to the deformation reducing of the guide array and avoid the possibility of further deformation of the guide bar during the forming process.
作者
杜悟迪
刘丰
单忠德
吴晓川
李思源
DU Wudi;LIU Feng;SHAN Zhongde;WU Xiaochuan;LI Siyuan(State Key Laboratory of Advanced Forming Technology and Equipment,China Academy of Machinery Science and Technology Group Co.ltd,Beijing 100083)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2020年第17期182-189,共8页
Journal of Mechanical Engineering
基金
国家自然科学基金(51675213)
机械科学研究总院技术发展基金资助项目。
