Impact Strength


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impact strength

[′im‚pakt ‚streŋkth]
(mechanics)
Ability of a material to resist shock loading.

Impact Strength

 

the ability of a material to absorb mechanical energy in the process of deformation and fracture under impact loading. The term “impact strength, ” as well as the term “impact energy, ” is also applied to the amount of energy absorbed before fracture.

To determine impact strength, a bending impact test is commonly used. The specimen in this case has a prismatic bar shape, and a transverse notch is cut in one side of the specimen. The impact strength is regarded as the work required for the fracture of the specimen. In the USSR the work is generally referred to the cross-sectional area of the specimen at the base of the notch and is expressed in joules per square meter, newton-meters per square meter, or kilogram-force-meters per square centimeter.

Impact strength is one of the most important strength characteristics of a metal. When the test temperature is lowered over a series of tests, a sharp drop in impact strength indicates the brittle temperature of the material. Reliable performance of the material is possible only at temperatures above the brittle temperature.

In another type of bending impact test that is sometimes used, a small fatigue crack is produced in advance at the base of the notch; the crack is 1.5 mm in length. In this case a measurement is made of the specific work required for fracture of the specimen. Compared with the impact strength as measured in the first type of test described, the impact strength measured in this way provides a more sensitive characterization of the brittleness of high-strength materials. (See alsoMECHANICAL PROPERTIES OF MATERIALS.)

S. I. KISHKINA

impact strength, impact energy

The amount of energy required to fracture a material; a measure of the material’s resistance to mechanical shock.
References in periodicals archive ?
This study showed that Group IV recorded the highest impact strength values followed by Group III, Group I, and Group II.
Impact Strength was calculated by dividing impact resistance (in KiloJoules) to area (in mm2) and finally calculated in KJ/m.
4[degrees]C, respectively, and the Charpy strength and Izod impact strength are 33.
The present study shown increase in the concentration and aspect ratio of E glass fiber (12mm long fiber 10 wt %) shown superior impact strength which is the main property for artificial prosthesis.
Comparing the notched impact strengths of the blends with different morphologies further confirm the aforementioned conclusion, that is, the fibrillar morphology can provide an improved impact strength relative to the droplet morphology.
The impact strength of various alloys was plotted against their aluminum content (Fig.
These results suggest thatthe impact strength of denture base acrylic resin is influenced by denture cleansers used.
It could be seen that the tensile strength decreased persistently, while the breaking elongation Increased and the impact strength various in "S" type curve when the amount of CPE is increased.
Despite the PBT/ABS/MGE blends studied so far presented very attractive values of impact strength properties, there is still a lack of studies concerning how these properties are affected by the extrusion parameters, like extrusion feed rate, screw rotation speed and geometry of the kneading blocks of the screw.
Chemline says high- impact strength is required when pipe is being laid.
impact strength at -4F (-20C) using an impact specimen per DIN 50115, U-notch, 10 ft-lb average with a minimum individual value of 8 ft-lb;