模拟参数对橡皮成形TB5钛合金凸弯边起皱模拟的影响

目的 针对高强钛合金成形时遇到的起皱问题,引入有限元模拟技术。方法 利用MATLAB对模拟结果的峰高进行量化。以橡皮成形TB5钛合金的凸弯边为考察对象,对板料初始网格、加载时间、加载方式及与橡皮接触的摩擦等模拟参数建立正交设计表L9(34),应用ABAQUS/Explicit模拟起皱,全面研究模拟参数对皱纹的影响。结果 研究全面评估了模拟参数对起皱模拟结果的影响,板料网格是影响起皱的最重要因素。结论 试验证明了TB5钛合金拥有良好的冷成形性能,但在成形过程中有起皱问题。     

深拉深薄壁不锈钢零件的几种起皱原因和解决方法

介绍了在制造一种深筒薄壁不锈钢拉深件中遇到的几种工件底部圆角起皱、口部起皱、侧壁纵向皱折、工件呈马蹄形、底部局部起皱现象和对零件进行表面观察、解剖分析,查找产生问题的原因,以及通过修整模具、调整间隙、选择变形系数等措施加以解决的经验和方法.     

羟基聚酯树脂的合成及其在美术型粉末涂料中的应用

介绍了一种粉末涂料用端羟基聚酯树脂的合成,用差热分析仪(DTA)分析了聚酯树脂的玻璃化转变温度(Tg),测试了树脂酸值、羟值和熔融黏度等理化指标;由聚酯树脂制成皱纹、龟纹等美术型粉末涂料,讨论了羟值和单体对羟基聚酯合成皱纹粉末涂料纹理效果的影响;讨论了不同粉末涂料配方对龟纹粉末涂料纹理效果的影响;测试了聚酯树脂粉末涂料...     

When Chirophotonic Film Meets Wrinkles: Viewing Angle Independent Corrugated Photonic Crystal Paper

Light manipulation strategies of nature have fascinated humans for centuries. In particular, structural colors are of considerable interest due to their ability to control the interaction between light and matter. Here, wrinkled photonic crystal papers (PCPs) are fabricated to demonstrate the consistent reflection of colors regardless of viewing angles. The nanoscale molecular self-assembly of a cholesteric liquid crystal (CLC) with a microscale corrugated surface is combined. Fully polymerizable CLC paints are uniaxially coated onto a wrinkled interpenetrating polymer network (IPN) substrate. Photopolymerization of the helicoidal nanostructures results in a flexible and free-standing PCP. The facile method of fabricating the wrinkled PCPs provides a scalable route for the development of novel chirophotonic materials with precisely controlled helical pitch and curvature dimensions. The reflection notch position of the flat PCP shifts to a lower wavelength when the viewing angle increased, while the selective reflection wavelength of wrinkled PCP is remained consistent regardless of viewing angles. The optical reflection of the 1D stripe-wrinkled PCP is dependent on the wrinkle direction. PCPs with different corrugated directions can be patterned to reduce the angular-dependent optical reflection of wrinkles. Furthermore, 2D wavy-wrinkled PCP is successfully developed that exhibit directionally independent reflection of color.