考虑层间内聚力的纤维增强金属层板成形工艺优化

Forming process optimization of fiber metal laminates considering interlaminar viscous cohesion

采用半固化充液成形技术成形纤维增强金属层板零件。提出一种评估层间内粘性聚力的试验方法,设计相关夹具以保证纤维增强金属层板在厚向载荷下层间可产生不协调变形,分析了层板在变形过程中层间粘性内聚力作用的规律,并探究了厚向载荷和相对变形速度对半固化层板变形的影响。结合层间树脂的变形特征及内聚力作用对半固化层板变形的影响规律,利用充液成形技术优化液室压力加载曲线,获得了质量良好的零件。结果表明,较小的成形速度、阶梯式的液室压力和压边力加载路径可使复合层板向深腔区进料多,层间应力松弛充分且层间粘性内聚力作用小,使层间发生有益的不协调变形,提高了层板的成形极限。

Fiber metal laminates( FMLs) parts were formed by semi-cured hydroforming forming technology. A test method evaluating the interlaminar viscous cohesion was proposed. Uncoordinated deformation of fiber metal laminates was guaranteed under thick load by designing a new fixture. The effect of the interlaminar viscous cohesion during the deformation process was analyzed. The influences of thick load and relative deformation speed on the deformation of semi-cured laminates were investigated. Considering the deformation characteristics of interlaminar resin and the influence of cohesion on deformation of semi-cured laminates,the hydraulic pressure loading curves were optimized by hydroforming forming technology,and the parts with good quality were obtained. The results show that the low forming speed,stepped hydraulic pressure and blank holder force loading paths can make the composite laminate flow more into the deep cavity area,sufficient interlayer stress relaxation and small interlaminar viscous cohesion,beneficial uncoordinated deformation occurs between composite layers,which increases the forming limit of the laminates.