Impact Notch Test is a test method performed to provide information about the mechanical properties of metallic and non-metallic materials. It is a method of determining the behavior of a material subjected to a sudden load in bending or tension. Charpy Impact Test, the amount usually measured is the energy absorbed in the fracture of the specimen by a single impact.
Why is Impact Testing Important?
Impact resistance is one of the most important properties for a component designer to consider and one of the most difficult to quantify. In many applications, impact resistance is a critical measure of service life. More importantly, it poses a perplexing challenge to product reliability and durability today.
First, identify the following:
The impact energies that the component may encounter during its service life, the type of impact that will deliver this energy, and then a material that will resist such impacts during its projected service life must be selected. Mold stresses, polymer orientation, weak points (e.g. weld lines or transition zones) and part geometry affect impact performance. Impact properties also change when additives such as colorants are added to plastics.
Creep – Fracture
The most realistic impacts are bidirectional rather than unidirectional impacts. A greater complexity is introduced by choosing a creep or fracture failure mode. Brittle materials start to fracture at a low energy and completely shatter at a slightly higher energy. Other materials have different levels of ductility.
Many materials may exhibit creep or fracture failure depending on the type of test, speed and temperature conditions. In reality, it has a creep/fracture transition that occurs according to these variables.
APPLICATION STANDARDS
TS EN ISO 148-1: Metallic Materials-Charpy Tapping Test – Part 1: Test Method
TS EN ISO 9016: Destructive Tests on Welds in Metallic Materials – Tapping Tests – Test Specimen Location, Notch Direction and Inspection
ASTM E23: Standard Test Methods for Notched Bar Impact Testing of Metallic Materials
ASME Sec. IX
API 1104
AWS D1.5
ASTM A370