PVDF涂层织物拉伸力学性能试验研究  

Experimental study on mechanical properties of PVDF textile

作　　者：刘平[1,2] 吴刚[1] 唐柏鉴 周道传[2] 缪玮 

机构地区：[1]东南大学土木工程学院,南京210096 [2]江苏科技大学土木工程与建筑学院,镇江212005 [3]苏州科技大学土木工程学院,苏州215009

出　　处：《东南大学学报（自然科学版）》2017年第6期1195-1200,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51508238);江苏省博士后科研基金资助项目(1601014B)

摘　　要：为获得膜材的本构关系规律,以SH-1050P膜材为试验对象,采用纱线与拉伸方向夹角α为参数进行单轴拉伸破坏试验;然后进行多比例位移加载下的双轴拉伸试验,得到完整的单、双轴试验结果.假设膜片应变均匀且铺层与纱线无滑移,对单轴下膜片弹性模量与夹角α的关系进行了理论推导,并获得膜材力学参数与方向角α的解析公式.同时,假设膜片在双轴加载下为正交弹性双向材料,求解出不同比例加载下的双轴弹性模量与泊松比.结果表明,单轴下膜片弹性模量可按2%的应变划分为弹性与塑性2个阶段,其值与2倍夹角的正弦成线性关系.而双轴试验情况下,在1∶1等量加载时,双轴弹性模量与单轴相同;在非等量加载时,双向加载力离散越大,双轴弹性模量离散性也越大.To obtain the constitutive model of membrane,the uniaxial tensile failure experiments of SH-1050P textile were carried out using the angle of yarn and tensile direction as the parameters.Besides,the biaxial tensile test under biaxial loading with multiple loading ratio was also conducted to obtain the complete uniaxial/biaxial test data.The analytical formula about the relationship between the elastic modulus and the angle was derived based on the assumption that the strains of all the membranes are uniform and there is no slippage between ply and yarn,which can explain the experimental phenomena well.Meanwhile,the biaxial elastic modulus and Poisson's ratio under different proportional loading were obtained with the assumption of the membrane being a biaxial orthogonal elastic model under biaxial loading.The results show that the elastic modulus of the uniaxial test can be divided into the elasticity and plasticity stages according to the ultimate elastic strain of 2%.Both two elastic modulus values are proportional to 2 times of angle.As for the bi-axial test,the elastic modulus is the same as that of the uniaxial test when the loading ratio is 1∶1,and the discreteness of elastic modulus increases with the discreteness of the loading ratio.

关 键 词：膜材 双轴试验 力学性能 正交各向异性 

分 类 号：TU599[建筑科学—建筑技术科学]