Evaluation of a novel test method for the determination of strain rate-dependent material properties of high-performance fibers
Evaluation of a novel test method for the determination of strain rate-dependent material properties of high-performance fibers
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评估用于确定高性能纤维应变率相关材料性能的新型测试方法
DOI：
10.1016/j.prostr.2019.08.125
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Cherif
中科院分区：
文献类型：
--
作者：
Gerlach;Cherif
对于纤维增强塑料和混凝土应用中的钢筋，了解通常使用的高性能纤维(如碳纤维)的高速冲击和碰撞行为成为设计和确定新复合材料部件尺寸的重要方面。比冲击速度更重要的是纤维中产生的应变率，它定义了破坏行为。在目前的文献中，纤维材料的应变率测试在100-10001/S之间仍有一个空白，这一空白很难用现有的测量设备来弥合，即在伺服液压拉伸试验机和分离式霍普金森拉杆之间。提出了一种旋转驱动原理，其中的挑战出现在力的耦合、试件的可靠夹紧和应力-应变曲线的高速采集方面。在实施过程中，目前实现的速度高达40m/S，相当于150 mm试件长度的应变率为267m-1 S-1。样品和运动元件以随机模式制备，并通过数字图像相关(DIC)进行评估。力信号是从压电式称重传感器记录并关联的。通过分析发动机控制记录，获得了有关拉伸试验所耗能量的附加信息。DIC对高速图像的评价表明，试件在断裂前存在部分弹性碰撞，加速度达到极大值。因此，为了进行准确的评估，必须考虑应力平衡，并进一步优化冲击过程。
For reinforcement in fiber reinforced plastic and concrete applications, the knowledge of the high-velocity impact and crash behavior of typically used high-performance fibers, such as carbon fibers (CF), becomes an important aspect for designing and dimensioning new composite components. More important than the impact velocity is the resulting strain rate in the fiber, which defines the failure behavior. In current literature, there is still an open gap for fiber material testing for strain rates between 100 and 1000 1/s, which is difficult to close with the existing measurement setups, i.e. between servo-hydraulic tensile testing machines and Split-Hopkinson-tension-bars. A rotary drive principle is proposed where the challenge arises in coupling the force, in a reliable clamping of the specimens and in high-speed acquisition of the stress-strain curve. In the implementation process, speeds up to 40 m/s were currently achieved, which corresponds to a strain rate of 267 s-1for a specimen length of 150 mm. The specimen and the moving elements were prepared with stochastic patterns and evaluated by means of digital image correlation (DIC). The force signal is recorded and correlated from a piezoelectric load cell. Additional information on the energy dissipated by the tensile test was acquired by analyzing the engine control records. The evaluation of high-speed images by DIC shows that there is a partially elastic impact and acceleration reaches its maxima before the specimen’s rupture. Thus, for a precise evaluation, the stress equilibrium has to be taken into account and the impact process has to be further optimized.
纤维增强聚合物基钢筋和箍筋钢筋混凝土结构
DOI：
--
发表时间：
2018
期刊：
影响因子：
--
作者：
M. Lindner;Konrad Vanselow;S. Gelbrich;L. Kroll
通讯作者：
L. Kroll
现代卡罗系列的发展趋势的探讨
DOI：
--
发表时间：
2004
期刊：
影响因子：
--
作者：
W. Bleck;A. Frehn;P. Larour;G. Steinbeck
通讯作者：
G. Steinbeck