Modernization of the VK-350 Instrumented Drop Weight Impact Testing Machine for Impact Testing of Various Types

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
A. V. Kravchuk, E. A. Kondryakov, V. N. Zhmaka, V. V. Kharchenko
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Abstract

This study conducted modernization of the VK-350 instrumented drop weight impact testing machine (DWITM) developed at the Pisarenko Institute of Problems of Strength of the National Academy of Sciences of Ukraine, equipped with a high-speed strain and force recording system that allows recording a load diagram with a sampling rate of up to 20 MHz, and heating and cooling systems for testing specimens in a wide temperature range. Modernization was carried out to expand the functionality of the DWITM, namely, a new dynamometer and specimen fixing units for impact shear, compression and dynamic pushing tests were installed. The new dynamometer was calibrated for two ranges of amplification and test specimens of various types were tested. The DWITM was also equipped with a video recording system, which includes a high-speed PHOTRON FASTCAM NOVA S9 camera that allows recording the deformation and fracture process at a speed of up to 200,000 frames per second. The camera is equipped with a 12x zoom lens and stroboscopic high-frequency lamps for illumination with the GSVITEC MultiLED G8 control system. Based on the results of the impact bending and shear tests, video signals of the deformation and fracture of the specimens were obtained, which made it possible to determine the time of onset of plastic deformation and formation of adiabatic shear zones in the impact shear specimens, as well as the moment of crack appearance on the side surface of the Charpy specimen and to estimate the rate of its propagation.

Abstract Image

用于各种类型冲击试验的 VK-350 型仪器式落下砝码冲击试验机的现代化改造
本研究对乌克兰国家科学院皮萨连科强度问题研究所开发的 VK-350 型仪器式落锤冲击试验机(DWITM)进行了现代化改造,该试验机配备了高速应变和力记录系统,可记录采样率高达 20 MHz 的载荷图,还配备了加热和冷却系统,可在宽温度范围内对试样进行试验。为了扩大 DWITM 的功能,对其进行了现代化改造,即安装了一台新的测功机和试样固定装置,用于冲击剪切、压缩和动态推动试验。新的测功机校准了两个放大范围,并对各种类型的试样进行了测试。DWITM 还配备了视频记录系统,其中包括一台高速 PHOTRON FASTCAM NOVA S9 摄像机,可以每秒 20 万帧的速度记录变形和断裂过程。摄像机配备了 12 倍变焦镜头和频闪高频灯,通过 GSVITEC MultiLED G8 控制系统进行照明。根据冲击弯曲和剪切试验的结果,获得了试样变形和断裂的视频信号,从而可以确定冲击剪切试样中塑性变形和绝热剪切区形成的开始时间,以及夏比试样侧表面出现裂纹的时刻,并估算出裂纹的扩展速度。
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来源期刊
Strength of Materials
Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-
CiteScore
1.20
自引率
14.30%
发文量
89
审稿时长
6-12 weeks
期刊介绍: Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.
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