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Flaw Sensitivity and Tensile Fatigue of Poly(Vinyl Alcohol) Hydrogels
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-12-21 , DOI: 10.1002/mame.202000679 William J. Koshut 1 , Caleb Rummel 1 , David Smoot 1 , Alina Kirillova 1 , Ken Gall 1
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-12-21 , DOI: 10.1002/mame.202000679 William J. Koshut 1 , Caleb Rummel 1 , David Smoot 1 , Alina Kirillova 1 , Ken Gall 1
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Tensile fatigue behavior is commonly overlooked as researchers pursue the toughest hydrogels. This work describes a poly(vinyl alcohol) (PVA) hydrogel prepared through freezing–thawing (FT) processing to achieve varied monotonic strength and toughness. The monotonic tensile responses of relatively strong and weak versions of the hydrogel are studied with cylindrical hole and crack‐like flaws of different sizes to develop an understanding of monotonic strength in the presence of two different, extreme defect types. The monotonic strength of the samples with cylindrical defects is reasonably predicted using nominal stress which accounts for a loss of load‐bearing area, while linear‐elastic fracture mechanics gives a first‐order approximation of the impact of crack‐like flaw size on monotonic strength. A subset of key defected samples are further subjected to cyclic loading and fatigue failure at varying stress amplitude. The cylindrical defect samples outperformed cracked samples in fatigue, and the utilization of four FT cycles instead of two improved both monotonic toughness and fatigue properties. This work represents the first tensile fatigue analysis on defected hydrogel materials, sheds light on the behavior of hydrogels in cyclic loading environments, and evaluates both the monotonic toughness and fatigue behavior of soft materials with and without defects.
中文翻译：
聚乙烯醇水凝胶的缺陷敏感性和拉伸疲劳
随着研究人员追求最坚韧的水凝胶，通常会忽略拉伸疲劳行为。这项工作描述了一种聚乙烯醇（PVA）水凝胶，它是通过冻融（FT）工艺制备的，以获得不同的单调强度和韧性。研究了相对强弱版本的水凝胶的单调拉伸响应，研究了不同尺寸的圆柱孔和类似裂纹的裂纹，以了解两种不同极端缺陷类型下的单调强度。可以使用名义应力合理地预测具有圆柱形缺陷的样品的单调强度，这可以说明承载面积的损失，而线弹性断裂力学可以一阶近似地估计裂纹状缺陷尺寸对单调强度的影响。 。关键缺陷样本的子集在变化的应力振幅下进一步经受循环载荷和疲劳破坏。圆柱缺陷样品在疲劳方面的性能优于裂纹样品，利用四个FT循环而不是两个可改善单调韧性和疲劳性能。这项工作代表了对有缺陷的水凝胶材料的首次拉伸疲劳分析，阐明了水凝胶在循环加载环境中的行为，并评估了有缺陷和无缺陷的软材料的单调韧性和疲劳行为。
更新日期：2020-12-21
中文翻译：
聚乙烯醇水凝胶的缺陷敏感性和拉伸疲劳
随着研究人员追求最坚韧的水凝胶，通常会忽略拉伸疲劳行为。这项工作描述了一种聚乙烯醇（PVA）水凝胶，它是通过冻融（FT）工艺制备的，以获得不同的单调强度和韧性。研究了相对强弱版本的水凝胶的单调拉伸响应，研究了不同尺寸的圆柱孔和类似裂纹的裂纹，以了解两种不同极端缺陷类型下的单调强度。可以使用名义应力合理地预测具有圆柱形缺陷的样品的单调强度，这可以说明承载面积的损失，而线弹性断裂力学可以一阶近似地估计裂纹状缺陷尺寸对单调强度的影响。 。关键缺陷样本的子集在变化的应力振幅下进一步经受循环载荷和疲劳破坏。圆柱缺陷样品在疲劳方面的性能优于裂纹样品，利用四个FT循环而不是两个可改善单调韧性和疲劳性能。这项工作代表了对有缺陷的水凝胶材料的首次拉伸疲劳分析，阐明了水凝胶在循环加载环境中的行为，并评估了有缺陷和无缺陷的软材料的单调韧性和疲劳行为。
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