Comparative study of metal and composite z-pins for delamination fracture and fatigue strengthening of composites

被引：72

作者：

Pingkarawat, K. ^{[1
]}

Mouritz, A. P. ^{[1
]}

机构：

[1] RMIT Univ, Sch Engn, Sir Lawrence Wackett Aerosp Res Ctr, GPO Box 2476, Melbourne, Vic 3001, Australia

来源：

ENGINEERING FRACTURE MECHANICS | 2016年 / 154卷

关键词：

Polymer matrix composites; Z-pins; Delamination; Fracture; Fatigue; MODE-I; PINNED COMPOSITES; TOUGHNESS; ENVIRONMENT; RESISTANCE; MECHANISMS;

D O I：

10.1016/j.engfracmech.2016.01.003

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The influence of the material properties of z-pins on the mode I delamination properties of carbon-epoxy laminates is investigated. Improvements to the delamination fracture toughness and fatigue resistance of laminates reinforced in the through-thickness direction with z-pins made of metal (copper, titanium or stainless steel) or unidirectional carbon fibre composite is determined. Irrespective of the material, the z-pins are highly effective at increasing the fracture toughness and fatigue resistance by forming a large-scale bridging zone along delamination cracks. However, the fracture toughening and fatigue strengthening capacity of the z-pins is strongly dependent on their material properties, and increased in the order: copper (least effective), titanium, stainless steel and carbon fibre (most effective). The fracture and fatigue failure modes of the z-pins are also dependent on their material properties. The study reveals that improvements to the mode I fracture toughness and fatigue resistance can be optimized via a judicious choice of the z-pin material. Z-pins with high stiffness, strength and fatigue resistance (such as carbon fibre) provide the greatest improvement to the delamination toughness and fatigue strength. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：180 / 190

页数：11

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