Abstract

A novel interface strengthening and toughening method of Steel/PEEK joints was proposed in this article. The multi-scale combined features consisting of macro grooves and micro conical hole array were constructed on the steel sheet surface. The shearing fracture behavior of the Steel/PEEK joints was studied to reveal the influence law and mechanism of the diameter-to-depth ratio γ of micro conical holes on the infiltration effect of molten PEEK, the maximum shear force and the energy absorption property. Results indicated that the Steel/PEEK joints with different multi-scale combined features possessed great infiltration effect and achieved a much larger maximum shear force than the joints without multi-scale combined feature (the largest improvement was approximately 360% when the γ of micro conical hole was 1.5). The joints also underwent a typical three-stage failure process. As the γ of the micro conical holes decreased, the maximum shear force almost increased linearly and the absorbed energy increased exponentially. The load-carrying capacity and energy absorption property of the steel/30% short carbon fiber-reinforced PEEK joint did not improve considerably as desired owing to the non-ideal infiltration effect.

摘要

本文提出了一种新的钢/PEEK接头界面强化增韧方法。在钢板表面构建由宏观凹槽和微锥形孔阵列组成的多尺度组合特征。研究了Steel/PEEK接头的剪切断裂行为，揭示了微锥孔径深比γ对熔融PEEK渗透效果、最大剪切力和吸能性能的影响规律和机制。结果表明，具有不同多尺度组合特征的Steel/PEEK接头比没有多尺度组合特征的接头具有很好的渗透效果，获得的最大剪切力要大得多（当γ微锥形孔的直径为 1.5)。接头也经历了典型的三阶段失效过程。随着微锥孔γ的减小，最大剪切力几乎呈线性增加，吸收能量呈指数增加。由于渗透效果不理想，钢/30%短碳纤维增强PEEK接头的承载能力和能量吸收性能没有按预期显着提高。