CAJ | 학술논문

针对线性范围内的螺栓连接结构开展研究。在薄层单元理论基础上,提出了一种螺栓连接结构接触面刚度识别方法。采用正交各向异性本构关系的薄层单元模拟接触面,忽略螺栓和螺孔的影响,建立单个螺栓和多个螺栓搭接2种结构的初始有限元模型；根据试验模态参数,识别连接部位薄层单元材料参数。识别后,2种连接结构前四阶模态频率的计算结果最大误差不超过3.5%,表明识别后的薄层单元能准确反映接触界面的力学特征；文中方法适用于单个螺栓搭接和螺栓较密集工况的准确模拟。
침대선성범위내적라전련접결구개전연구。재박층단원이론기출상,제출료일충라전련접결구접촉면강도식별방법。채용정교각향이성본구관계적박층단원모의접촉면,홀략라전화라공적영향,건립단개라전화다개라전탑접2충결구적초시유한원모형；근거시험모태삼수,식별련접부위박층단원재료삼수。식별후,2충련접결구전사계모태빈솔적계산결과최대오차불초과3.5%,표명식별후적박층단원능준학반영접촉계면적역학특정；문중방법괄용우단개라전탑접화라전교밀집공황적준학모의。
A study on the linear bolted-joint connection was conducted in this paper.By adopting thin-layer element theory,a method for stiffness identification of the interface of the bolted-joint structures was proposed based on the parameter identification techniques.Neglecting effects of the bolt and the bolt-hole,two different kinds of finite element models were constructed based on thin-layer element with orthotropic constitutive relationship which is used for modeling the contact surface.An optimization problem was formulated using experimental modal data for identifying the constitutive parameters of the thin-layer element. When the identi-fied parameters were employed in the finite element model,the maximum error between the computational and experimental results on the first four modal frequencies is less than 3.5%,which demonstrates that the thin-layer elements with identified parameters can accurately model the mechanical characteristics of the contact interface.The proposed method is especially suitable for precisely sim-ulating the dynamic characteristics of the structures with single and multiple bolted joints.