超轻X型点阵芯体金属夹层板的剪切疲劳机制  

Shear Fatigue Mechanisms of Ultralightweight X-Type Lattice Truss-Cored Metallic Sandwich Panels

作　　者：张钱城[1,2] 韩云杰[1] 卢天健[2] 

机构地区：[1]西安交通大学金属材料强度国家重点实验室,西安710049 [2]西安交通大学强度与振动教育部重点实验室,西安710049

出　　处：《西安交通大学学报》2010年第11期61-65,共5页Journal of Xi'an Jiaotong University

基　　金：国家重点基础研究规划资助项目(2006CB601202);国家自然科学基金资助项目(10572111;10632060);国家高技术研究发展计划资助项目(2006AA03Z519);国家"111计划"资助项目(B06024)

摘　　要：通过试验测量了超轻X型结构芯体与金字塔点阵芯体不锈钢夹层板的剪切性能和剪切疲劳性能,并对二者的标准化疲劳极限Δτe/τp值进行了比较分析.结果表明:X型结构夹层板的Δτe/τp值不仅与钎焊结点的平台化相关,而且也与其剪切应变幅度相关.理论分析认为,在低剪切应变幅度和高载荷率的情况下,金属网在剪切和扩展工艺过程中形成的裂纹等加工缺陷是导致夹层板剪切疲劳极限降低的主要因素.The shear and shear fatigue behaviors of uhralightweight X-type lattice truss-cored metallic sandwich panels with designated node area for brazing are experimentally investigated. Compared with pyramidal lattice truss-cored sandwiches, the shear endurance limit of the X-type sandwich is dependent upon not only the designated node area, but also the shear strain capacity. Further theoretical analysis demonstrates that if the shear strain capacity is low and the load ratio is high, cracks and other defects formed during the shear and expansion processes of the expanded metal sheets play a leading role in decreasing the shear fatigue performance of X-type sandwich structures.

关 键 词：夹层板 钎焊 剪切疲劳 制造缺陷 

分 类 号：TB33[一般工业技术—材料科学与工程] TG4[金属学及工艺—焊接]