【作者】 陈亮；

【导师】 周文龙；

【作者基本信息】 大连理工大学 ， 材料加工工程， 2013， 硕士

【摘要】 全缠绕复合材料气瓶在航空航天、军事和民用领域都有广泛的应用,随着科学技术的发展和进步对复合气瓶使用性能的要求越来越高。复合气瓶制造过程中工艺参数的选择对后期气瓶的使用性能有重要影响。因此为了提高复合气瓶的使用性能,对其主要工艺参数进行优化就显得尤为重要。本文基于ANSYS有限元计算软件,建立了56L和130L复合气瓶的三维有限元计算模型,对影响复合气瓶的疲劳性能和爆破压强的主要工艺参数进行了分析和优化。计算了不同壁厚的内衬的屈曲压强,以确定不同厚度的内衬在纤维缠绕和固化过程中所能承受的最大外压力。.本文使用温度参数法模拟直筒段纤维张力的施加,并计算了复合材料缠绕层由于纤维张力而作用在内衬上的应力。对影响复合气瓶疲劳性能的主要工艺参数进行了优化,主要包括自紧压力、内衬厚度和张力制度。计算分析结果表明,当自紧压力为49MPa时56L和130L复合气瓶拥有最优异的疲劳性能和应力状态分布：内衬厚度与疲劳寿命的关系为：在1.1mm-2mm范围内,复合气瓶的疲劳寿命随着内衬厚度的增加而增加,并且接近线性关系：在本文所计算的三种张力制度下,当张力制度为70-0.5N(第一层纤维的张力为70N,之后每层递减0.5N)时复合气瓶表现最高的疲劳寿命。对影响复合气瓶爆破压强的重要工艺参数进行了计算分析,主要包括张力制度和螺旋缠绕层的切根位置。计算结果表明在本文所计算的三种张力制度下,56L和130L复合气瓶在70-0.5N张力制度下拥有最高的爆破压强,56L复合气瓶为95MPa,而130L复合气瓶为94MPa。螺旋缠绕层的切根位置对复合气瓶的爆破压强没有直接影响,但是当切根过早时,在切根位置会形成应力集中。以上上计算结果与实验结果吻合的较好,对复合气瓶的生产工艺优化有较大的应用价值。更多还原

【Abstract】 Fully-wrapped composite cylinder has been widely used in aviation and space industries and military as well as many civil areas. With the advance of science and technology, the higher demands of properties of composite vessels are required. The properties of composite cylinder are heavily affected by its technology parameters, so an important way to improve the properties is to optimize the main technology parameters. Based on ANSYS finite element software we established three dimension finite element model of56L and130L composite cylinders to analysis and optimize the main technology parameters which had big influence on these cylinders’fatigue property and burst pressure.To confirm the biggest compress pressure that can be enforced on the liner when winding fiber on the liner or during solidification process, we first calculated the bucking pressure of liners of different wall thickness. Then we used temper-parameter method to model fiber tension of the ladle body. And calculated compress stress of the ladle body of liner indicated that fiber tension can be effectively exerted by temper-parameter method.Parameters that had big influence on fatigue property of composite cylinders including autofrettage pressure, wall thickness of liner and fiber tension are optimized. And results indicated that when autofrettage pressure was49MPa the cylinders had the best fatigue property and stress distribution. With the increase of wall thickness of liner the fatigue life of cylinders increase too. Under the three fiber tensions we calculated in this paper, composites cylinders have the highest fatigue life when the fiber tension was70-0.5.At last we optimized these technology parameters which had big effect on burst pressure of composites cylinders including fiber tension and ending point of spiral winding fibers. And it could be concluded that under the three fiber tensions we calculated the biggest burst pressures which were94MPa for130L cylinder and95MPa for56L cylinder were reached when the fiber tension was70-0.5. And another conclusion was that the ending points of spiral winding fibers had no direct effect on burst pressure, but if the fibers were ended too early then at the ending point there would be stress concentrating.All the results we calculated matched well with the data of experiment, and they had contributed to the optimize process of technology parameters.更多还原