循环应力松弛下黄麻织物/聚乙烯复合材料能量耗散演化规律

doi:10.13475/j.fzxb.20191203007

摘要/Abstract

摘要：

为探讨麻纤维增强热塑性复合材料在复杂受力条件下的能量耗散特性,以黄麻织物为增强体,聚乙烯膜为基体,采用热压法制备了黄麻织物/聚乙烯复合材料,并对其在循环应力松弛下的力学性能进行测试,分析应力松弛时间、循环应力峰值、循环次数对应变能(总应变能、弹性应变能、塑性应变能)和应变能系数(可恢复与不可恢复应变能系数)的影响规律。结果表明:经、纬向试样的变形规律与能量演化机制一致,应变能与应变能系数不仅与应力松弛时间、循环应力峰值密切相关,同时还与循环次数密切相关;循环应力松弛下的弹性应变能变化趋势迥异于无应力松弛过程的简单循环加载。

关键词: 黄麻织物, 聚乙烯, 循环应力松弛, 应变能, 能量耗散

Abstract:

In order to investigate the energy dissipation characteristics of jute fiber reinforced thermoplastic composite under complex stress conditions, jute fabric/polyethylene composites were prepared using hot pressing with jute fabric as reinforcement and polyethylene film as matrix. The mechanical properties under cyclic stress relaxation were tested,and the effects of stress relaxation time, peak cyclic stress and cyclic number on evolution of the strain energy (total strain energy, elastic strain energy, plastic strain energy) and strain energy factor (recoverable and unrecoverable strain energy factor) were also analyzed. The results show that deformation mechanism and energy dissipation evolution of warp and fill specimen have good agreement. The strain energy and strain energy factor are governed by stress relaxation time, peak cyclic stress, and as well as cyclic number. Moreover, it is found that the elastic strain energy under cyclic stress relaxation is different from that under simple cyclic loading without stress relaxation.

Key words: jute fabric, polyethylene, cyclic stress relaxation, strain energy, energy dissipation

中图分类号:

TS101.923

汪泽幸, 吴波, 李帅, 何斌. 循环应力松弛下黄麻织物/聚乙烯复合材料能量耗散演化规律[J]. 纺织学报, 2020, 41(10): 74-80.

WANG Zexing, WU Bo, LI Shuai, HE Bin. Energy dissipation evolution of jute fabric/polyethylene composite under cyclic stress relaxation[J]. Journal of Textile Research, 2020, 41(10): 74-80.

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