当前位置: X-MOL 学术J. Compos. Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Macroscale bending large-deformation and microbuckling behavior of a unidirectional fiber-reinforced soft composite
Journal of Composite Materials ( IF 2.9 ) Pub Date : 2019-07-07 , DOI: 10.1177/0021998319854145
Xin Lan 1 , Sida Hao 1 , Liwu Liu 2 , Yanju Liu 2 , Jinsong Leng 1
Affiliation  

Due to microscale fiber microbuckling, a fiber-reinforced soft composite demonstrates large macroscale bending deformation (e.g. 10% reversible macroscale compressive strain), which is larger than that of a convenient fiber-reinforced plastics (e.g. 1.5–2% elongation/compression at break). To investigate the deformation behavior, a normalized average energy density of a fiber-reinforced soft composite laminate was derived. By using a self-consistent approach according to the minimum energy principle, a series of analytical expressions were derived by a simplified theoretical method through solving simplified partial differential equations of average energy density. Furthermore, an improved numerical calculation method was developed using the full four terms of partial differential equations of average energy density by employing the results of simplified theoretical method as initial calculating values. The dimensionless results demonstrated that the trend correlated well between those two methods, and the improved numerical method obtained more accurate results than those of the simplified theoretical method. Analytical and numerical results in normalized expressions systematically descripted the bending large-deformation behavior including position of neutral surface and critical buckling, wavelength, amplitude, shearing strain, macroscale compressive/tensile strain, buckled fiber strain, and actuation moment. To design a fiber-reinforced soft composite for use in engineering, the simplified theoretical method is used to predict trend and obtain approximate results for preliminary design, and the improved numerical method is further used to check and obtain more accurate results on detailed design stage.

中文翻译:

单向纤维增强软复合材料的宏观弯曲大变形和微屈曲行为

由于微尺度纤维微屈曲,纤维增强软复合材料表现出大的宏观弯曲变形(例如 10% 的可逆宏观压缩应变),这比方便的纤维增强塑料(例如 1.5-2% 的断裂伸长率/压缩应变)更大)。为了研究变形行为,推导出了纤维增强软复合材料层压板的归一化平均能量密度。根据最小能量原理,采用自洽方法,通过求解简化的平均能量密度偏微分方程,用简化的理论方法推导出一系列解析表达式。此外,以简化理论方法的结果为初始计算值,利用平均能量密度偏微分方程的全四项,提出了一种改进的数值计算方法。无量纲结果表明这两种方法之间的趋势相关性很好,改进的数值方法比简化的理论方法获得了更准确的结果。归一化表达式中的分析和数值结果系统地描述了弯曲大变形行为,包括中性表面的位置和临界屈曲、波长、振幅、剪切应变、宏观压缩/拉伸应变、屈曲纤维应变和驱动力矩。设计用于工程的纤维增强软复合材料,
更新日期:2019-07-07
down
wechat
bug