单轴拉伸确定粘弹性材料瞬时模量的测试方法  

Measurement of the Instantaneous Modulus of Viscoelastic Materials by Uniaxial Tensile Test

作　　者：刘二强[1] 肖革胜[1] 王鹤峰[1] 杨雪霞[2] 树学峰[1] 

机构地区：[1]太原理工大学应用力学与生物医学工程研究所,山西太原030024 [2]太原科技大学应用科学学院,山西太原030024

出　　处：《高分子材料科学与工程》2016年第8期104-108,114,共6页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(11172195);山西省青年科技研究基金(2015021017);山西省高等学校科技创新项目(2015167)

摘　　要：对尼龙12材料分别进行单轴拉伸蠕变和率跳动测试,用以得到拉伸蠕变柔量和率跳动前后对应的应力-应变响应关系,进而获得各测试条件下对应的瞬时模量。基于弹簧粘壶组合本构模型的拉伸蠕变测试方法仅适用于线性粘弹性材料,率跳动测试方式则可适用于非线性粘弹性材料。结果表明,2种方法得到的瞬时模量值相近,而相对于率跳动直接测量粘弹性材料瞬时模量方法,拉伸蠕变间接测定的方法更为高效准确。The uniaxial tensile creep and rate-jump tests were performed on PAl2 specimens to obtain the tensile creep compliance and stress rate-strain rate response just before and just after the imposed jump, and the instantaneous modulus under two different kinds of test conditions were figured out. The tensile creep test method based on constitutive model consisted of elastic springs and viscous dashpots is only suitable for linear viscoelastic materials, but the rate-jump test method can be applicable to nonlinear viscoelastic materials. Results show that the values measured by two methods are similar, however compared to rate-jump test, the tensile creep test method is a more efficient way to gain the instantaneous modulus of viscoelastic materials.

关 键 词：蠕变柔量 率跳动 瞬时模量 粘弹性材料 

分 类 号：O631.21[理学—高分子化学]