燃料电池编织复合材料侧板的力学分析  

Mechanical Analysis of Braided Composite End-Plate in Fuel Cell Stack

作　　者：周平[1] 吴承伟[1] 于平[1] 

机构地区：[1]大连理工大学,大连116024

出　　处：《中国机械工程》2005年第22期2056-2060,共5页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(10272028);高等学校博士学科点专项基金资助(20030141013)

摘　　要：为了减小整体结构体积和重量,现代燃料电池结构大量使用纤维增强复合材料。针对燃料电池复合材料侧板中经常出现的螺栓沉孔局部破坏现象进行了研究。利用Anasys有限元分析程序对复合材料侧板上的螺栓沉孔和螺帽垫片进行了接触力学分析,主要研究了螺栓直径和螺栓沉孔内圆角对结构破坏的影响,发现在螺栓沉孔内圆角处主要是复合材料层间拉伸破坏,而螺栓沉孔边缘处主要是局部压缩破坏。当螺栓沉孔内圆角大于某个临界值时,拉伸破坏基本被抑制;沉孔边缘的压缩破坏主要引起材料的局部损伤,但不引起整体破坏。另外,还对二维编织复合材料的层间力学性能和压缩破坏机理做了初步研究,发现这类复合材料层间基体压缩破坏不是材料的最后破坏形式,并得到了试验验证。Fabric reinforced composites are widely used in modern fuel cell stacks in order to decrease the volume and weight. This research accounted for the local failures in bolt holes, which often taken place in the braided composite end-plates. FEM software, ANSYS, was used to analyze the contact process between the bolt hole in the composite material and the steel gasket. The effects of bolt diameter and fillet radius on the structure failure were studied. It is found that tensile failures mainly take place in the places of fillets. But the local pressed failures occur first at the edges of the bolt holes. However, if the fillet radius is greater than a critical value, no tensile failure occurs there. The local pressed failure on the edge of the bolt hole causes only a local damage, but cannot cause a structure failure. The mechanical behavior and compressive destruction mechanism of a 2-D braided composite were also primarily studied. It is found that the interlaminar compressive failure cannot cause the final destruction of the materials, which is a general problem and supported by the experiments.

关 键 词：燃料电池 复合材料 螺栓沉孔 有限元方法 

分 类 号：TM911.4[电气工程—电力电子与电力传动]