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Investigations on the influence of notched z-pins on the mechanical properties of carbon-fiber reinforced plastics

缺口Z型销对碳纤维增强塑料力学性能的影响研究

基本信息

批准号：
398803737
负责人：
Professor Dr.-Ing. Gerhard Scharr
金额：
--
依托单位：
Lehrstuhl für Konstruktionstechnik / Leichtbau
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/398803737?language=en
关键词：
Investigations influence notched pins mechanical

项目摘要

Fiber reinforced plastics (FRP) offer excellent mechanical properties regarding the fiber direction due to their microstructural construction of load-bearing fibers and shaping matrix. By contrast, a structure made of FRP loaded perpendicular to the laminate plane exhibits inferior mechanical properties, making it susceptible to delamination, e.g. due to interlaminar shear or impact stresses. The insertion of z-pins through the thickness of polymer matrix composites has been found to be a promising and low-cost method to enhance the interlaminar shear strength and reduce the mentioned vulnerability to delamination. Z-pins are needle-shaped, usually round bars, with diameters of typically 0.1-1.0 mm, and consist of materials with a high stiffness and strength, such as steel, titanium or carbon fiber reinforced plastics (CFRP). In conjunction with pre-impregnated semi-finished products (prepregs), the z-pinning technique is the most commonly used method for through-thickness reinforcement of FRP. Numerous studies have shown that the z-pinning is a very effective method to increase the damage tolerance of FRP. The aim of this project is the further increase of the effectiveness of z-pins by the application of a surface structure via ultra-short laser pulses and thus the creation of a form closure between the pins and laminate. Based on internal preliminary work, the influence of different surface structures on the mechanical properties of carbon fiber reinforced plastics and an optimal surface geometry should be determined.

纤维增强塑料（FRP）由于其承载纤维和成型基体的微观结构构造，在纤维方向上提供优异的机械性能。相比之下，由垂直于层压板平面加载的FRP制成的结构表现出较差的机械性能，使其易于分层，例如由于层间剪切或冲击应力。通过聚合物基复合材料的厚度插入z-销已被发现是一种有前途的和低成本的方法，以提高层间剪切强度和减少所提到的分层的脆弱性。Z销是针形的，通常是圆棒，直径通常为0.1-1.0 mm，并且由具有高刚度和强度的材料组成，例如钢、钛或碳纤维增强塑料（CFRP）。结合预浸渍半成品（预浸料），z钉扎技术是FRP全厚度加固最常用的方法。大量的研究表明，z钉扎是提高FRP损伤容限的一种非常有效的方法。该项目的目的是通过超短激光脉冲应用表面结构，从而在销和层压板之间形成闭合，进一步提高z销的有效性。基于内部前期工作，应确定不同表面结构对碳纤维增强塑料力学性能的影响以及最佳表面几何形状。