泡沫铝夹芯板的三点弯曲疲劳性能  

Three-point Bending Fatigue Performances of Foam Aluminum Sandwich Panels

作　　者：赵明凯 王慧慧 万一品 宋绪丁[1] ZHAO Mingkai;WANG Huihui;WAN Yipin;SONG Xuding(Key Laboratory of Road Construction Technology and Equipment of the Ministry of Education,Chang’an University,Xian 710061,China)

机构地区：[1]长安大学道路施工技术与装备教育部重点试验室,陕西西安710061

出　　处：《材料科学与工程学报》2024年第4期633-638,共6页Journal of Materials Science and Engineering

基　　金：陕西省自然科学基础研究计划项目(2021JQ-283)。

摘　　要：为探讨夹芯板结构准静态下的弯曲失效模式和疲劳性能,以304不锈钢为面板,7050铝合金基体闭孔泡沫铝为芯层,组成泡沫铝夹芯板结构。基于三点弯曲试验获得夹芯板结构损伤变形过程和静态峰值载荷。通过三点弯曲疲劳试验得到疲劳寿命和破坏形式,采用最小二乘法和极大似然法绘制夹芯板的S-N和P-S-N曲线,并进行对比分析。结果表明:夹芯板在静态加载时的弯曲失效与载荷-位移曲线相吻合;在疲劳加载时失效方式较为单一,90%的试件因芯层断裂而失效。夹芯板疲劳寿命随着面板厚度的增加而增加,当芯层密度从0.60 g/cm^(3)增加到0.73 g/cm^(3)时,疲劳寿命反而出现下降;当芯层密度为0.60 g/cm^(3),面板厚度为0.6 mm时,夹芯板结构对加载水平敏感度最低。研究结果为夹芯板结构工程应用提供了设计基础。In order to explore the bending failure as well as fatigue life of sandwich structures under quasi-static conditions,the damage deformation process under three-point bending conditions was investigated with 304 stainless steel as panels and 7050 aluminum alloy substrate with closed-cell foam aluminum as the core layer.The static peak loads of different specimens were determined by the three-point bending load method.The bending life and damage forms were obtained by high-frequency fatigue testing machine.The S-N and P-SN curves of different sandwich panels were plotted for comparative study.The results show that the bending failure of the sandwich plate under static state is consistent with the load-displacement curve.The failure mode of sandwich plate under fatigue state is relatively single,and 90%of the specimens fail is due to core fracture.The fatigue life of sandwich panel increases with the increase of panel thickness.When the core density increases from 0.60 g/cm^(3) to 0.73 g/cm^(3),the fatigue life no longer continues to increase but begins to decrease.When the core density is 0.60 g/cm^(3) and the panel thickness is 0.6 mm,the fitting effect is the best and the sensitivity to the loading level is the lowest.This study provides a design basis for the subsequent practical engineering application of sandwich panels.

关 键 词：泡沫铝夹芯板 面板厚度 芯层密度 疲劳性能 

分 类 号：TG142.15[一般工业技术—材料科学与工程]