【作者】 陈浩；

【导师】 刘敬喜； 肖曙明；

【作者基本信息】 华中科技大学 ， 船舶与海洋工程， 2021， 硕士

【摘要】 当今船舶领域,对船舶性能、低能耗、绿色、环保等方面要求越来越高,由于复合材料的比强度、比刚度高,且其优异的耐化学腐蚀性能、抗疲劳性能、绝缘性能、吸波透波性能、无磁特性,被广泛应用于船体结构材料。然而,纵使复合材料具备众多优异的性能,船体结构仍以金属材料为主,复合材料主要用于上层建筑、桅杆、附体、轻型舱壁、螺旋桨等次级承力结构或非承力结构。本文针对钢-复合材料连接接头结构形式进行分析研究,通过其在不同载荷条件下的承载能力表现,选择合适的连接接头形式,为以后复合材料用作船体结构材料提供依据。通过有限元和试验对比的方式,进行连接接头承载能力的研究。本文选择Hashin准则作为本文钢-复合材料接头判据,在本质上更贴近复合材料的失效形式。在有限元模拟连接接头胶接层时,引入了基于弹塑性断裂力学的内聚力模型,对连接接头在拉伸、弯曲、低速冲击工况下的承载能力分析。经过试验数据与有限元仿真数据的对比,首先,验证了有限元仿真方法合理可行;其次,在拉伸承载时,从失效模式来看,影响连接接头的拉伸承载能力的主要因素是粘接剂的强度;再次,在弯曲承载时,连接接头的结构形式对其承载能力影响较大;最后,在低速冲击承载时,冲击区域的不同,对其冲击承载能力有较大影响。本文分别对“Y型”“K型”“H型”三种钢-复合材料连接接头形式进行分析,得出在不同承载特点的情况下,各连接接头的承载能力特点,为复合材料在船体不同部位的使用提供依据,使复合材料在船舶领域的使用能更好的适应船舶各部位的受力特点。更多还原

【Abstract】 In nowadays’ shipbuilding industry,ship requirements of ship performance,low energy consumption,environment friendly are getting higher and higher.Due to the high specific strength and specific stiffness of composite materials,and its excellent chemical corrosion resistance,fatigue resistance,insulation performance,wave absorption and transmission performance,non-magnetic characteristics,widely used as hull structure materials.However,even though composite materials have many excellent properties,the hull structure is still dominated by metal materials,composite materials are mainly used for secondary load-bearing structures or non-bearing structures such as superstructures,masts,appendages,light bulkheads,and propellers.This paper analyzes and studies the structural form of the steel-composite connection joint,through its carrying capacity performance under different load conditions,choose the appropriate connection joint form,provide basis for future use of composite materials as hull structural materials.Through the comparison of finite element and experiment,studying the bearing capacity of the connection joint.In this paper,the Hashin criterion is selected as the criterion for steel-composite joints,which in essence is closer to the failure mode of composite materials.In the finite element simulation of the adhesive layer of the connection joint,a cohesive force model based on elastoplastic fracture mechanics is introduced,analysis of the load-bearing capacity of connected joints under tensile,bending,and low-speed impact conditions.Comparison of experimental data and finite element simulation data,first of all,it verified that the finite element simulation method is reasonable and feasible;secondly,in the tensile load,from the point of view of failure mode,the main factor affecting the tensile bearing capacity of the connected joint is the strength of the adhesive;thirdly,in the bending load,the structural form of the connection joint has a greater influence on its load-bearing capacity,finally,in the low-speed impact load,the impact area has a greater impact on its impact load capacity.This paper analyzes the three types of steel-composite connection joints,"Y-type","Ktype",and "H-type".It is concluded that under different bearing characteristics,bearing capacity characteristics of each connection joint,providing basis for the use of composite materials in different parts of the hull.The use of composite materials in the ship can better adapt to the force characteristics of various parts of the ship.更多还原