Thermodynamic analysis of fatigue failure in a composite laminate

被引：82
作者：
Naderi, M. [1 ]
Khonsari, M. M. [1 ]
机构：
[1] Louisiana State Univ, Dept Mech Engn, Baton Rouge, LA 70803 USA
来源：
MECHANICS OF MATERIALS | 2012年 / 46卷
关键词：
Fatigue; Fracture; Woven Glass/Epoxy laminate; Thermodynamic entropy; FIBER-REINFORCED MATERIALS; LOADING CONDITIONS; DAMAGE PARAMETER; FABRIC COMPOSITE; ENERGY; PREDICTION; CRITERION; STRESS; WEAR; DISSIPATION;
D O I：
10.1016/j.mechmat.2011.12.003
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We put forward a thermodynamic approach for analyzing fatigue failure in a composite laminate. We show that fatigue is an irreversible progression of increasing entropy that accumulates until it reaches a critical value called the fracture fatigue entropy (FFE) at the onset of failure. Extensive series of fatigue tests are carried out that involve load-controlled tension-tension, and displacement controlled fully-reversed bending fatigue with three different stress ratios as well as constant- and variable-loading. The role of hysteresis energy in the entropy generation is investigated. FFE values are calculated based the experimental data obtained for temperature and hysteresis energy of a woven Glass/Epoxy (G10/FR4) laminate. The concept of tallying entropy accumulation and the use of FFE are useful for determining the fatigue life of composite laminates undergoing cyclic loading. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：113 / 122
页数：10
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