The effects of strain rate, size (height × width), and pre-existing crack length on the mechanical response of polycaprolactone electrospun membranes were investigated by tension tests conducted at room temperature. In particular, tensile tests were performed with three different strain rates for strain rate effect tests, seven different geometries for elucidating the size effect, and three different initial notch lengths for crack growth experiments. The electrospun membranes were produced by the electrospinning technique using a polycaprolactone solution prepared in 1, 1, 1, 3, 3, 3-hexafluoro-2-propanol as the solvent. Scanning electron microscopy was utilized to show the continuous fiber structure without bead formation. The average fiber diameter was calculated as 1.113 ± 0.270 μm by using scanning electron microscopy images of the membranes. The chemical structure of polycaprolactone was analyzed by Fourier transform infrared spectroscopy, and the toxicity and cell viability of the electrospun membranes were shown by CellTiter 96^® Aqueous One Solution Cell Proliferation Assay (MTS test). It was observed that the ultimate tensile strength and Young’s modulus decreased, and the elongation at failure value increased as the strain rate decreased from 10⁻¹ to 10⁻³ s⁻¹. Besides, positive strain rate sensitivity was observed on the mechanical response of electrospun polycaprolactone membranes. Moreover, the dependency of mechanical response on the size geometry has been well studied, and the optimum height and width combinations were specified. Also, crack growth was studied in terms of both macroscopic and microstructural deformation mechanisms and it is observed that individual fiber deformations and interactions are highly effective on the mechanical behavior and also propagation of the crack. Consequently, in this study, the size and strain rate effects and crack growth on the mechanical response of electrospun polycaprolactone membranes have been investigated extensively, and the results presented herein constitute an essential guideline for the usage of polycaprolactone electrospun membranes at different loading scenarios.

通过在室温下进行的拉伸试验研究了应变速率、尺寸（高度 × 宽度）和预先存在的裂纹长度对聚己内酯电纺膜机械响应的影响。特别是，拉伸试验采用三种不同的应变速率进行应变率效应测试，七种不同的几何形状用于阐明尺寸效应，以及三种不同的初始缺口长度进行裂纹扩展实验。电纺膜是通过静电纺丝技术生产的，使用在 1, 1, 1, 3, 3, 3-六氟-2-丙醇中制备的聚己内酯溶液作为溶剂。使用扫描电子显微镜来显示没有珠形成的连续纤维结构。通过使用膜的扫描电子显微镜图像计算平均纤维直径为 1.113 ± 0.270 μm。^®一种水溶液细胞增殖试验（MTS 试验）。观察到，随着应变速率从 10 ^-1降低到 10 ^-3  s ^-1，极限拉伸强度和杨氏模量降低，断裂伸长率增加. 此外，在电纺聚己内酯膜的机械响应上观察到正应变速率敏感性。此外，已经很好地研究了机械响应对尺寸几何形状的依赖性，并指定了最佳高度和宽度组合。此外，从宏观和微观结构变形机制方面研究了裂纹扩展，观察到单个纤维变形和相互作用对裂纹的力学行为和传播非常有效。因此，在这项研究中，对静电纺聚己内酯膜的机械响应的尺寸和应变率影响以及裂纹扩展进行了广泛的研究，