复合材料泡沫夹层结构界面的温度-应变分布

Distribution of Interfacial Temperature Shear Stress of Sandwich Structures with FRP Skins and Foam Core

复合材料泡沫夹层结构由于其比强度高、比刚度高、耐腐蚀等特点已广泛在土木工程领域中获得应用。然而,由于复合材料面板与夹芯材料在温度荷载作用下热膨胀系数显著不同,因此在面板与芯材之间的粘结层会产生温度应力,因此会降低界面的粘结性能。本文通过试验研究,系统地给出了复合材料泡沫夹层结构界面温度-应变分布规律,并通过理论建模,提出了界面温度-应变分布规律的计算模型,通过对比实验值与理论值,验证了理论分析模型的精确性。

In recent years, sandwich structures are widely used in civil engineering due to their advantages of high strength to weight ratios, high stiffness to weight ratios and anti-corrosion ability. However, the temperature stress can be generated in the interface layer of sandwich structures because of the different coefficient of thermal expansion of FRP skins and foam core, thus leading delamination to occure. To investigate the shear stress distribution in the interface layer, a series of tests, involving FRP laminates and sandwich structures, were conducted. The distribution of shear strain under different temperatures were summarized. In the meantime, an analytical model was also developed to calculate the shear stress and describe the distribution of shear strain by the use of infinitesimal method. Finally, the comparison between experimental and analytical results demonstrates that the proposed analytical model can be adopted to predict the distribution of interracial temperature shear stress of sandwich structures.