Conducting Elevated Temperature Normal and Combined Pressure-Shear Plate Impact Experiments Via a Breech-end Sabot Heater System (original) (raw)
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2021
In this paper, perforation experiments were carried out and numerically modelled in order to analyze the response of 2024-T3 aluminum alloy plates under different initial temperatures T0. This alloy has a particular relevance since it is widely used as a structural component in aircrafts, but it is also interesting for other sectors of industry. A gas gun projectile launcher was used to perform impacts within initial velocities V0 from 40 m/s to 120 m/s and at temperatures varying from 293 K to 573 K. A temperature softening of the material was observed which was manifested in the reduction in the ballistic limit by 10% within the temperature range studied. Changes in the material failure mode were also observed at different test conditions. Additionally, a finite element model was developed to predict the material response at high velocities and to confirm the temperature softening that was observed experimentally. An optimization of the failure criterion resulted in a reliable mod...
Fatigue & Fracture of Engineering Materials & Structures, 2006
The SPLASH experiment has been designed in 1985 by the CEA to simulate thermal fatigue due to short cooling shocks on steel specimens and is similar to the device reported by Marsh in Ref. [1]. The purpose of this paper is to discuss the mechanical and the fatigue analysis of the experiment using results from FEM computations. The lifetime predictions are obtained using a modified dissipated energy with a maximal pressure term and agree with the experimental observations. The numerical analysis of the mechanical state shows an important evolution of the triaxiality ratio during the loading cycle. Further comparisons and discussions of the fatigue criteria are provided in the second part of the paper (Part II)2.
IJERT-Investigation of Low Energy Impact Behavior of Prepreg Composite Plates at High Temperatures
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/investigation-of-low-energy-impact-behavior-of-prepreg-composite-plates-at-high-temperatures https://www.ijert.org/research/investigation-of-low-energy-impact-behavior-of-prepreg-composite-plates-at-high-temperatures-IJERTV4IS070212.pdf CFRP (Carbon Fiber Reinforced Composites) prepreg laminated composite plates have been subjected to low energy impact test at 25°C, 40°C and 60°C. AS4 carbon is chosen as fibre material and 8552 epoxy resin as matrix. The samples have been prepared as 150 X 100 mm. width/length and 2.94 mm. (thickness)-16 layered, 1,84 mm.-10 layered and 1,47 mm.-8 layered respectively and have been orientated as quasi-isotropic. The impact tests have been carried out with Instron Dynatup 9250 drop weight impact tester according to ASTM D7136 for samples cured at 40°C, 60°C and 25°C. It has been observed that; as the temperature increases, contact forces decreases and contact time increases. The laminate number and lay up orientation also affect the low impact energy behavior of prepregs. It has been concluded experimentally that as the temperature increases, impact strength of CFRP prepregs decreases.
International Journal of Solids and Structures, 2010
This paper presents and analyzes the behaviour of TRIP 1000 steel sheets subjected to low velocity perforation by conical projectiles. The relevance of this material resides in the potential transformation of retained austenite to martensite during impact loading. This process leads to an increase in strength and ductility of the material. However, this transformation takes place only under certain loading conditions strongly dependent on the initial temperature and deformation rate. In order to study the material behaviour under impact loading, perforation tests have been performed using a drop weight tower. Experiments were carried out at two different initial temperatures T0 = 213 K and T0 = 288 K, and within the range of impact velocities 2.5 m/s ⩽ V0 ⩽ 4.5 m/s. The experimental setup enabled the measuring of impact velocity, residual velocity, load-time history and failure mode. In addition, dry and lubricated contacts between the striker and the plate have been investigated. Finally, by using X-ray diffraction it has been shown that no martensitic transformation takes place during the perforation process. The causes involving the none-appearance of martensite are examined.