Fracture toughness of hydrothermally aged epoxy systems with different crosslink density

被引：8

作者：

Alessi, Sabina ^{[1
]}

Di Filippo, Maria ^{[1
]}

Pitarresi, Giuseppe ^{[1
]}

Scafidi, Michele ^{[1
]}

Toscano, Andrea ^{[1
]}

机构：

[1] Univ Palermo, DICGIM, Palermo, Italy

来源：

XXIII ITALIAN GROUP OF FRACTURE MEETING, IGFXXIII | 2015年 / 109卷

关键词：

Fracture Toughness; Hydrothermal Aging; Thermosetting Resin; Swelling Stresses; Photoelastic Stress Analysis; Image Analysis; STRESSES; RESIN;

D O I：

10.1016/j.proeng.2015.06.257

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The present work investigates the fracture toughness behaviour of Single Edge Notched Bending (SENB) samples of epoxy systems subject to water uptake aging. Two epoxy systems with a significantly different Glass Transition Temperature, T-g, are in particular considered: a typical commercial non-aeronautical grade resin matrix for composite applications, reaching a T-g of 90 degrees C, and a DGEBA+DDS epoxy system achieving a T-g of 230 degrees C. The materials have been conditioned by hydrothermal aging in a thermal bath at the temperature of 50 degrees C. Transmission Photoelastic Stress Analysis is carried out on SENB samples during water aging, monitoring the presence and evolution of swelling stresses. The K-IC Fracture toughness is measured and correlated with the internal stress field, with the water diffusion kinetics evaluated by gravimetric tests, and with the data from DMTA analyses. Results have highlighted significant differences in the fracture behaviour of the two epoxy systems. (C) 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

引用

页码：507 / 516

页数：10

共 17 条

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