加载角度对交叉层缺口生物钴复合材料失效的影响

IF 5 2区 材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
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引用次数: 0

摘要

使用改进的 Arcan 试验夹具,以 15° 为增量,从 0° 到 90° 的加载角度,对交叉层状玄武岩 V 型缺口蝶形试样进行了纯拉伸、拉伸-剪切组合和剪切应力-应变状态试验。使用主应力和应变比研究多轴应力和应变状态,从中确定主角,并用它来表示量具截面中的主状态。确定了每个加载角度的准弹性到非线性过渡应力。在双轴应力-应变状态和纯剪切状态下,变形和剪切引起的损伤开始显著累积。此外,在 15°-75° 之间的双轴应力-应变状态下,在应力-应变曲线的非线性部分过渡之后,观察到了从拉伸-剪切到纯剪切的转变。数字图像相关(DIC)图像和显微镜评估表明,0°夹持纤维旋转后的剪切变形造成了很大程度的损坏,而 90°夹持纤维则保持了原有的直线形态。在偏轴试验中,即使偏轴角度很小,主应变轴也会向最薄弱的材料轴旋转。这导致从线性加载部分的拉伸-剪切双轴状态过渡到非线性部分的剪切状态,从而导致过渡点以外的不可逆损坏。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Effects of Loading Angles on the Failure of Cross-Ply Notched Bio-Basalt Composites
A cross-ply basalt V-notched butterfly specimens were subjected to pure tension, combined tension-shear, and shear stress-strain state using a modified Arcan test fixture with loading angles from 0° to 90° with 15° increment. Multiaxial stress and strain states were studied using the principal stress and strain ratio, from which the principal angle was determined and used to represent principal states in the gauge section. The quasi-elastic to non-linear transition stresses were determined for each loading angle. In biaxial stress-strain states and pure shear, the deformation and consequently the shear-induced damage start to accumulate significantly. Also, in biaxial stress-strain states between 15°-75°, the shift from tension-shear to pure shear was observed after the transition to the non-linear part of the stress-strain curve. The digital image correlation (DIC) images and microscopic evaluation show that a large extent of damage is the consequence of the shear deformation after the rotation of 0° clamped fibres, while the 90° fibres maintained their original straight form. In off-axis tests, the principal strain axis rotates towards the weakest material axis even at small off-axis angles. This causes a transition from a tension-shear biaxial state in the linear loading part to shear in the non-linear part, leading to irreversible damage beyond the transition point.
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来源期刊
Polymer Testing
Polymer Testing 工程技术-材料科学:表征与测试
CiteScore
10.70
自引率
5.90%
发文量
328
审稿时长
44 days
期刊介绍: Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.
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