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Characterization of applied tensile stress to carbon epoxy composites by measuring the variation of transverse thermal conductivity using transmission thermography
Journal of Composite Materials ( IF 2.9 ) Pub Date : 2019-10-08 , DOI: 10.1177/0021998319880596
M Bayat 1 , MS Safizadeh 1
Affiliation  

Using the method of step heating thermography, this study seeks to detect and characterize the existence of stress in a beam sample of carbon epoxy composite with the stacking sequence of [08] aided by empirical and simulation approaches. The applied stress in the longitudinal direction of sample, while considering the Poisson’s ratio, changes the lateral dimensions of sample. Furthermore, it is shown that the thermal conductivity along the sample thickness varies as a result of stress existence. Accordingly, to obtain a relation between transverse thermal conductivity and longitudinal tensile stress, one should calculate and eliminate the effect of lateral deformation caused by stress. To this end, by combining the experimental and simulation results of composite sample under the action of different tensile loads, an equation describing the variation of thermal conductivity along the sample thickness with respect to applied stress is developed. Using the relation of transverse thermal conductivity variation in terms of applied stress, the finite element modeling is again carried out by rectifying the values of thermal conductivity. Simulation results are compared with experimental ones, indicating very good agreement between the two approaches.

中文翻译:

通过使用透射热成像测量横向热导率的变化,表征施加到碳环氧树脂复合材料上的拉伸应力

本研究使用阶梯加热热成像法,通过经验和模拟方法,通过[08]的堆叠顺序,检测和表征碳环氧树脂复合材料梁样品中应力的存在。沿样品纵向施加的应力,在考虑泊松比的同时,改变了样品的横向尺寸。此外,还表明,由于应力存在,沿样品厚度的热导率会发生变化。因此,要获得横向热导率与纵向拉应力的关系,应计算并消除应力引起的横向变形的影响。为此,结合复合材料试样在不同拉伸载荷作用下的实验和模拟结果,开发了一个方程,描述了沿样品厚度的热导率随外加应力的变化。使用横向热导率随外加应力变化的关系,通过修正热导率值再次进行有限元建模。仿真结果与实验结果进行了比较,表明两种方法之间非常吻合。
更新日期:2019-10-08
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