Hladnik Jurij, Jerman Boris
Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, 1000 Ljubljana, Slovenia.
Materials (Basel). 2023 Oct 8;16(19):6596. doi: 10.3390/ma16196596.
Rock wool insulation slabs are produced in special curing ovens, where molten rock wool fibres coated with binder are compressed between two slat conveyors and blown with hot air for vitrification. Often, the cross-section of the final slabs is slightly convex, which is undesirable. The degree of convexity depends on the deformation of the steel crossbars of the slat conveyors, which are subjected to combined pressure and nonlinear temperature loadings. Due to this complex loading state, it is difficult to determine the contribution of individual load to the total deformation. The main aim of the study was to determine these contributions. Temperature and stress measurements of the crossbars were performed during rock wool production. Upon collecting these measurements, a finite element (FE) model of a crossbar was established for the identification of the pressure loading acting on the crossbars, and finally for determination of their deformations. As a main result of the study, an inverse problem-based methodology for the identification of the deflection of a structure due to unknown temperature and pressure loadings was established and applied on the specific case. The deviations between the deformations of the FE crossbars and the final shape of the rock wool slabs were below 10%, which validates the novel methodology.
岩棉保温板是在特殊的固化炉中生产的，在那里，涂有粘合剂的熔融岩棉纤维在两条板条输送机之间被压缩，并用热空气吹制以进行玻璃化。通常，最终板材的横截面会略有凸起，这是不理想的。凸起程度取决于板条输送机钢横杆的变形情况，这些横杆承受着组合压力和非线性温度载荷。由于这种复杂的载荷状态，很难确定单个载荷对总变形的贡献。该研究的主要目的是确定这些贡献。在岩棉生产过程中对横杆进行了温度和应力测量。收集这些测量数据后，建立了横杆的有限元（FE）模型，用于识别作用在横杆上的压力载荷，并最终确定其变形。作为该研究的主要成果，建立了一种基于反问题的方法，用于识别由于未知温度和压力载荷引起的结构挠度，并将其应用于具体案例。有限元横杆的变形与岩棉板最终形状之间的偏差低于10%，这验证了该新方法的有效性。
