Fracture toughness of transverse cracks in graphite/epoxy laminates at cryogenic conditions

被引：43

作者：

Choi, Sukjoo ^{[1
]}

Sankar, Bhavani V. ^{[1
]}

机构：

[1] Univ Florida, Dept Mech & Aerosp Engn, Gainesville, FL 32611 USA

来源：

COMPOSITES PART B-ENGINEERING | 2007年 / 38卷 / 02期

基金：

美国国家航空航天局;

关键词：

polymer-matrix composites; fracture toughness; finite element analysis; thermal analysis; cryogenic temperature;

D O I：

10.1016/j.compositesb.2006.06.005

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Stress singularity of a transverse crack normal to ply-interface in a composite laminate is investigated using analytical and finite element methods. Four-point bending tests were performed on single-notch bend specimens of graphite/epoxy laminates containing a transverse crack perpendicular to the ply-interface. The experimentally determined fracture loads were applied to the finite element model to estimate the fracture toughness. The procedures were repeated for specimens under cryogenic conditions. Although the fracture loads varied with specimen thickness, the critical stress intensity factor was constant for all the specimens indicating that the measured fracture toughness can be used to predict delamination initiation from transverse cracks. For a given crack length and laminate configuration, the fracture load at cryogenic temperature was significantly lower. The results indicate that fracture toughness does not change significantly at cryogenic temperatures, but the thermal stresses play a major role in fracture and initiation of delaminations from transverse cracks. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：193 / 200

页数：8

共 14 条

[1]

Agarwal BhagwanD., 1990, ANAL PERFORMANCE FIB

[2]

Anderson T.L., 1994, FRACTURE MECH FUNDAM

[3]

CHOI S, 2003, P 5 INT C THERM STRE

[4] CRACK DEFLECTION AT AN INTERFACE BETWEEN 2 ORTHOTROPIC MEDIA [J].

GUPTA, V ;

ARGON, AS ;

SUO, Z .

JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME, 1992, 59 (02) :S79-S89

[5] MIXED-MODE CRACKING IN LAYERED MATERIALS [J].

HUTCHINSON, JW ;

SUO, Z .

ADVANCES IN APPLIED MECHANICS, VOL 29, 1992, 29 :63-191

[6]

*NASA, 2000, FIN REP X 33 LIQ HYD

[7] Prediction of delamination initiation and growth from discontinuous plies using interface elements [J].

Petrossian, Z ;

Wisnom, MR .

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, 1998, 29 (5-6) :503-515

[8] INITIATION AND GROWTH OF DELAMINATION FROM THE TIPS OF TRANSVERSE CRACKS IN CFRP CROSS-PLY LAMINATES [J].

TAKEDA, N ;

OGIHARA, S .

COMPOSITES SCIENCE AND TECHNOLOGY, 1994, 52 (03) :309-318

[9] SINGULARITIES AT THE TIP OF A CRACK NORMAL TO THE INTERFACE OF AN ANISOTROPIC LAYERED COMPOSITE [J].

TING, TCT ;

HOANG, PH .

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, 1984, 20 (05) :439-454

[10]

TING TCT, 1981, P 2 US USSR S FRACT, P265

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