Time-dependent behavior of flax/starch composites

被引：11
|
作者：
Varna, J. [1 ]
Sparnins, E. [1 ,3 ]
Joffe, R. [1 ]
Nattinen, K. [2 ]
Lampinen, J. [2 ]
机构：
[1] Lulea Univ Technol, S-97187 Lulea, Sweden
[2] Tech Res Ctr Finland, Tampere 33101, Finland
[3] Latvia Univ, Inst Polymer Mech, Riga, Latvia
来源：
MECHANICS OF TIME-DEPENDENT MATERIALS | 2012年 / 16卷 / 01期
关键词：
Nonlinear viscoelasticity; Viscoplasticity; Material modeling; Creep; Strain recovery; Natural fiber composite; PAPER FIBER COMPOSITES; MATERIAL MODEL; VISCOELASTICITY;
D O I：
10.1007/s11043-011-9156-7
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The time-dependent mechanical response of flax fiber-reinforced thermoplastic starch matrix composite and neat starch is analyzed. It is demonstrated that the response is highly sensitive to the relative humidity (with specific saturation moisture content in the composite) and special effort has to be made to keep it constant. It was found that the accumulation of micro-damage and the resulting reduction of the elastic modulus in this type of composite is limited. The highly nonlinear behavior of composites is related to the nonlinear viscoelasticity and viscoplasticity. These phenomena are accounted for by simple material models, as suggested in this study. The stress-dependent nonlinearity descriptors in these models are determined in creep and strain recovery tests at low as well as by high stresses.
引用
收藏
页码：47 / 70
页数：24
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