针织物与机织物膜材的力学特性对比

Comparison on Mechanical Properties of Knitted Fabric and Woven Fabric Membrane

关键词:  针织物膜材  机织物膜材  力学特性  强度准则  本构模型

Key words:  knitted fabric membrane  woven fabric membrane  mechanical property  strength criterion  constitutive model

摘要:

对比了Seaman PVDF8028双轴向经编织物膜材和Ferrari 1202T2膜材在0^o、15^o、30^o、45^o、60^o、75^o和90^o下抗拉强度与断裂延伸率的变化规律以及断裂形式，研究了Tsai-Hill强度准则、Norris强度准则以及Hashin强度准则对2种膜材的适用性；对比了2种膜材在0^o、15^o、30^o、45^o、60^o、75^o和90^o下的偏轴撕裂形式以及撕裂特性，研究了2种膜材的双轴力学特性，以及线性和非线性正交各向异性本构模型对2种膜材本构关系的适用性.研究结果可以为工程设计提供理论参考.

Abstract:

The variation rules of tensile strength and strain at break of the Seaman PVDF8028 biaxial warp knitted membrane and Ferrari 1202T2 membrane at seven biaxial angles of 0^o， 15^o， 30^o， 45^o， 60^o， 75^o and 90^o were compared. The applicability of Tsai Hill strength criterion， Norris strength criterion and Hashin strength criterion to the two kinds of membranes was studied. The off-axis tear patterns and tear characteristics of the two kinds of membranes at 0^o， 15^o， 30^o， 45^o， 60^o， 75^o and 90^o off-axis angles were compared. The biaxial mechanical properties of the two kinds of membranes were compared， and the applicability of linear and nonlinear orthotropic constitutive models to the constitutive relations of the two kinds of membranes was discussed， which can provide theoretical reference for engineering design.