| Autor: |
Huan, Dajun, Li, Yong, Tan, Yan, Zhang, Xiangyang, Xiao, Jun |
| Předmět: |
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| Zdroj: |
Journal of Reinforced Plastics & Composites; Nov2017, Vol. 36 Issue 22, p1639-1650, 12p |
| Abstrakt: |
Z-pin technology, as a promising through-thickness reinforcement, offers an efficient solution for the weak composite parts joints, especially for large integrated composite structures. This paper presents a two-dimensional finite element model to analyze the enhancing efficiency of Z-pins for composite T-joints. The modeling used a new parameter definition method for delamination growth simulation in Z-pinned joining interface via a regional cohesive zone model. The finite element model was validated by experiments for unpinned and Z-pinned T-joints under web pullout tension. The parametric analysis on the structural configuration shows that shear stress ratio in Z-pins declines with the span ratio increasing and the skin thickness ratio decreasing, which leads to the failure mode change of a single pin from pull-out to shear fracture so that the improvement on the out-of-plane tension declines gradually. Within 1.7–2.1 span ratio (the constant 4 mm skin thickness) or 1.8–2.5 thickness ratio (the 200 mm constant span), the ultimate tension is improved by at least 15%, where Z-pins exhibit the best efficiency. When span ratio is above 2.4 or thickness ratio below 1.2 within the range studied herein, Z-pinned T-joints fail by skin fracture rather than the bonding interface in which cases further increasing of Z-pin reinforcements becomes unfavorable. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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