Residual Strain Monitoring and Dynamic Characteristics of Hybrid Hollow Square Tube with Metal–FRP–Metal Sandwich Walls

IF 3.4 4区 化学 Q2 POLYMER SCIENCE International Journal of Polymer Science Pub Date : 2022-10-28 DOI:10.1155/2022/9254833
Zhao Li, Mingyao Liu, Jintao Wang, W. Ke
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Abstract

In order to design and fabricate a novel hollow square tube (HST) for ram structure in machine tools, the hybrid HST with sandwich walls based on steel skins and unidirectional carbon fiber-reinforced polymer (CFRP) composite core is proposed. A detailed co-cured fabrication method with embedded fiber Bragg grating (FBG) sensors for residual strains/stresses determination in a hybrid metal–composite structure is presented. Results reveal that the hybrid HST has undergone complex residual strain history, and the strain rate is about 10 times the cooling rate. The tensile strains in the dwell stage transform into compressive strains in the cooling stage due to the mismatch of the coefficients of thermal expansion of the steel plates and the CFRP composite. A comparison of the residual strains in the cooling phase obtained by FBG sensors with those obtained by theoretical calculation is carried out. Furthermore, the dynamic characteristics of the hybrid HST and the steel HST are tested. The results showed that the damping of the hybrid HST is 586% higher than that of the steel HST, while the hybrid HST has a lower first natural frequency (4.6% reduction) and mass (15.9% weight reduction). The influence of co-cure temperature and cooling rate on the size and state of the residual strains is analyzed, which might be helpful to guide the manufacturing of sandwich structures in machine tools. This novel hybrid HST may be used for online health monitoring and safety evaluation to build intelligent machine tools structures.
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金属-玻璃钢-金属夹芯混合空心方管残余应变监测及动态特性
为了设计和制造一种新型的机床滑枕结构空心方管,提出了一种基于钢皮和单向碳纤维增强聚合物复合芯的夹层壁复合式空心方管。提出了一种采用嵌入式光纤布拉格光栅(FBG)传感器进行混合金属复合材料结构中残余应变/应力测量的共固化制造方法。结果表明,混合HST经历了复杂的残余应变历史,应变速率约为冷却速率的10倍。由于钢板与CFRP复合材料热膨胀系数的不匹配,在冷却阶段拉伸应变转变为压缩应变。对FBG传感器测得的冷却阶段残余应变与理论计算结果进行了比较。此外,还对混合HST和钢HST的动态特性进行了测试。结果表明,混合HST的阻尼比钢HST高586%,而混合HST的第一固有频率(降低4.6%)和质量(降低15.9%)较钢HST低。分析了共固化温度和冷却速率对残余应变大小和状态的影响,为机床夹层结构的制造提供了指导。这种新型混合HST可用于机床结构的在线健康监测和安全评估。
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来源期刊
CiteScore
6.10
自引率
0.00%
发文量
55
审稿时长
>12 weeks
期刊介绍: The International Journal of Polymer Science is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles on the chemistry and physics of macromolecules.
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