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An Introduction to Materials
Published in Paul J. Hazell, Armour, 2023
A Charpy impact test consists of releasing a pendulum of a fixed mass and length such that it impacts a V-notched sample. Despite the fact that the velocity of impact is low (~5 m/s), the strain rate accessed in a Charpy test can be quite high due to the small dimension over which plastic deformation occurs (Meyers and Chawla, 1999). The sample is square in cross section and has a V-notch machined into one surface. Once a fracture occurs in the sample, the amount of energy that is transferred to the sample can be estimated by measuring the initial and final heights of the pendulum. This provides a measure of the energy to fracture the sample. Both the size of the notch and the size of the sample affect the result, and therefore, this test is only used to compare the impact toughness for identical geometries of samples. Hence, the results are more qualitative in nature and are generally of little use for design purposes—except in the sense of when comparing similar materials.
Introduction
Published in M. Rashad Islam, Civil Engineering Materials, 2020
The Charpy impact test determines the amount of energy absorbed by a material until fracture. It is also known as the Charpy V-notch test. This absorbed energy is a measure of a given material’s notch toughness. The test apparatus is mainly a pendulum of known mass and length. It is dropped from a known height to impact a notched specimen, as shown in Figure 1.15. The energy transferred to the material can be inferred by comparing the difference in the height of the hammer before and after the fracture (energy absorbed by the fracture event). Chapter 9 discusses further the impact test for steel material.
Mechanical Properties of Metals
Published in Zainul Huda, Metallurgy for Physicists and Engineers, 2020
In a Charpy impact test, a heavy pendulum of 2 kgf, released from a height of 15 cm, strikes the specimen on its downward swing thereby fracturing it. The height at the end of swing is 4 cm. Calculate the impact energy. Is the material ductile or brittle?
Synthesis and characterisation of natural ceramic reinforced Titanium Metal Matrix composite
Published in Canadian Metallurgical Quarterly, 2021
Charpy impact test measures the toughness or energy absorption capacity of the material. Tough materials absorb a lot of energy, while brittle materials tend to absorb very little energy before fracture. The test was conducted to measure the toughness of titanium composite. In this test, the specimen was supported as a simple beam with a notch in the center. It was arranged in such a way that the notch was on the vertical face away from the point of impact. The impact performance of the composite sample by Charpy impact test was reported to be 37.2 joule. Fu et al. reported the Charpy impact strength of pure Ti is ∼28.75 J [24]. The significant increase in the Charpy impact test due to reinforcement of silica concludes the increase in toughness of material.