英国索尔福德大学王禹教授学术讲座

Numerical modelling for liquid moulding process of advanced composites manufacturing

主讲人 : 王禹 教授

Liquid Composite Moulding (LCM) is a widely used technology in the manufacture of composite components. In LCM fibre reinforcement or preform is placed into a sealed mould and resin is injected through a gate in the mould to impregnate the reinforcement. There are several variations in application, such as resin transfer moulding (RTM) and vacuum assisted resin transfer moulding (VARTM). Numerical modelling of Liquid Composite Moulding (LCM) processes has undergone significant developments in the past decades. In recognition of the deficiency of continuum single-scale models for woven or stitched fibre reinforcements which consist of two distinctively scaled pore networks (the macro inter-tow-pore network and the micro intra-tow-pore network), advanced dual-scale modelling has become of more interest. The resin flow within the gaps between fibre tows (macro-scale or inter-tow) and that in the capillary channels inside fibre tows (micro-scale or intra-tow) have significantly different flow rates. Consequently, the two inconsistent flow in the mould results in the local regions of no full resin impregnation or voids left in the final products. The characteristics of unsaturated flow in LCM processes have been demonstrated in experiments showing a visible partially saturated liquid flow front, measurement of unsaturated permeability, and the ‘drooping’ of the inlet pressure under constant injection rates. A novel dual-scale models for LCM processes for woven fibre reinforcement was proposed, which adopts a physical unit-cell impregnation model to characterise the micro-scale flow in plain woven reinforcements. The unit-cell impregnation model later is implemented in a comprehensive continuum LCM model at the macroscopic mould scale to simulate the full LCM processes. Both modelling and experimental tests have proven the effectiveness of the modelling approach.

主讲人简介：

王禹，博士，英国索尔福德大学科学、工程与环境学院土木工程系准教授（Reader），重庆巴渝学者讲座教授（2016），在英国阿斯顿大学获得博士学位，在英国布里斯托尔大学、伦敦帝国学院和普利茅斯大学进行了数年的研究工作。于2007年在索尔福德大学被任命为英国研究理事会学术研究员。在钢筋腐蚀、混凝土结构耐久性、可持续绿色混凝土等学科和领域具有广泛的兴趣和国际影响的研究成果。在非饱和多孔材料的水力-物理本构特性、多孔介质渗流过程的分析方法和数值模拟，以及孔隙尺度和块体尺度的流体-结构相互作用等基础科学做出了学术创新贡献。发表100多篇学术论文，指导了8名博士研究生，并与英国、欧盟、中国、伊拉克、澳大利亚、巴西、美国和俄罗斯等国家的大学建立了广泛的研究合作关系，领导并参与了欧盟“地平线2020”、英国皇家学会等许多由政府和工业界资助的研究项目。