PVC/TPU共混材料静动态力学性能及本构模型研究
Study on static and dynamic mechanical properties and constitutive model of PVC/TPU blends
雷经发 1胡基波 2刘涛 1吴文奇 2沈朝阳2
作者信息
- 1. 安徽建筑大学机械与电气工程学院,合肥 230601;工程机械智能制造安徽省教育厅重点实验室,合肥 230601
- 2. 安徽建筑大学机械与电气工程学院,合肥 230601
- 折叠
摘要
利用万能材料试验机和高速拉伸试验机对2种成型方式和6种共混比的聚氯乙烯/热塑性聚氨酯(PVC/TPU)共混材料开展静动态拉伸力学性能测试,并基于断裂伸长率和邵氏硬度进行成型方式和共混比优选.进一步获取了共混材料在较宽应变率范围(0.001～700 s-1)的应力-应变数据,并进行了拉伸断面的微观表征.结果表明,模压成型材料断裂伸长率更高,共混比为90/10时材料具有最高的断裂伸长率,邵氏硬度符合试验假人软组织材料的硬度范围(邵尔40～70 A).共混比为90/10(PVC/TPU)材料在静动态载荷下均具有显著的应变率效应.选取朱-王-唐(ZWT)方程和Sherwood-Frost方程构建了材料的本构模型,对比发现Sherwood-Frost方程拟合效果更好.形貌分析发现,静动态加载下,材料均为典型的脆性断裂,未出现明显的相分离现象.随着应变率的增加,断面逐渐变粗糙,并产生空穴及微小裂纹.
Abstract
In this study,both universal material testing and high-speed tensile testing machines were used to measure the static and dynamic tensile mechanical properties of the poly(vinyl chloride)(PVC)/thermoplastic polyurethane(TPU)blends by using two molding methods and six blending ratios.The molding methods and blending ratios were optimized according to the fracture elongation and Shore hardness of the blends.The stress-strain data were obtained in a wide strain-rate range of 0.001～700 s-1,and microscopic characterization was carried out up on the cross-section of the ten-sile samples.The results indicated that the molded material obtained higher fracture elongation,and it achieved maxi-mum fracture elongation at a PVC/TPU mass ratio of 90/10.The Shore hardness meets the hardness range of the soft tissue material of the test dummy(Shore 40～70 A).The PVC/TPU(90/10)blends exhibited a significant strain-rate effect under both static and dynamic loads.The Zhu-Wang-Tang′s and Sherwood Frost′s equations were employed to construct a constitutive model for the blends,and a comparative investigation indicated that the Sherwood Frost′s equa-tion had better fitting effect.The topography analysis indicated that under static and dynamic loads,the blends exhibited a typical brittle fracture without significant phase separation.As the strain rate increased,the cross-section became rough gradually and produced voids and small cracks.
关键词
聚氯乙烯/热塑性聚氨酯/应变率/本构模型Key words
poly(vinyl chloride)/thermoplastic polyurethane/strain rate/constitutive model引用本文复制引用
基金项目
合肥市自然科学基金(2021019)
安徽省高等学校自然科学研究重大项目(KJ2023AH040036)
安徽省高等学校自然科学研究重大项目(KJ2021ZD0068)
安徽省高等学校协同创新项目(GXXT-2023-025)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据