Nematic elastomer, consisting of mesogens and polymer network, has emerged as a promising material for constructing soft actuators and attracted much attention in recent years. In this paper, we conduct a systematic study of uniaxial tension of a nematic elastomer film with the loading direction forming different angles with respect to the mesogen alignment. We found that if the two ends of the film are clamped without allowing rotation during the stretch, inhomogeneous deformation in the specimen often occurs. However, if both ends of the film can freely rotate during the stretch, the film elongates and shears nearly homogeneously. Our theoretical predictions based on the free energy function of nematic elastomer agree well with experimental measurements of the elastomer undergoing homogeneous deformation with only two fitting parameters. The necking phenomena observed in nematic elastomer during the uniaxial tension have also been discussed.

由介晶和聚合物网络组成的向列弹性体已成为一种有前景的用于构造软致动器的材料，近年来引起了广泛的关注。在本文中，我们对向列弹性体薄膜的单轴张力进行了系统的研究，其加载方向相对于液晶元排列形成了不同的角度。我们发现，如果在拉伸过程中将薄膜的两端夹紧而不允许旋转，则样品中经常会发生不均匀变形。但是，如果薄膜的两端在拉伸过程中可以自由旋转，则薄膜会伸长并几乎均匀地剪切。我们基于向列弹性体的自由能函数的理论预测与仅具有两个拟合参数的经历均匀变形的弹性体的实验测量结果非常吻合。