INSTRUMENTED LOW-VELOCITY IMPACT OF CFRP BEAMS

被引：25

作者：

LIFSHITZ, JM

GOV, F

GANDELSMAN, M

机构：

[1] Material Mechanics Laboratory, Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa

来源：

INTERNATIONAL JOURNAL OF IMPACT ENGINEERING | 1995年 / 16卷 / 02期

关键词：

D O I：

10.1016/0734-743X(94)00048-2

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Low velocity impact of carbon fiber reinforced epoxy (AS4/3502 by Hercules) was conducted with 48 and 40 layered beams of different combinations of 0 degrees, 90 degrees, 45 degrees and -45 degrees stacking sequences. The test set-up included an instrumented drop weight and data acquisition system. Beams of two lengths were tested: ''long'' (100 mm) and ''short'' (55 mm), under impact and quasi-static loading conditions. The acceleration pulse was analysed in the frequency domain to determine the source of high frequency vibrations and a simple two-degrees-of-freedom model was used to distinguish between the force on the striker and the force applied to the beam. It is shown that the elastic response of the beams is the same under the two loading regimes. However, there is a difference in the strength of the beams according to the loading mode: both load and energy at failure under impact are lower than under quasi-static conditions. Nevertheless, the kinetic energy that is required to initiate fracture of the beam must be at least equal to the fracture energy under quasi-static conditions. The relative loss energy is related to the decrease in the rigidity of the beam.

引用

页码：201 / 215

页数：15

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