Jännitysvenymäkoe

Jännitysvenymäkoe, or tensile testing, is a fundamental mechanical test used to determine the properties of a material under tensile stress. During the test, a specimen of the material is subjected to a gradually increasing pulling force until it fractures. The force applied and the resulting elongation of the specimen are measured and recorded.

The data collected from a jännitysvenymäkoe can be plotted on a stress-strain curve. This curve reveals critical material characteristics such as the yield strength, which is the point at which the material begins to deform plastically; the ultimate tensile strength, the maximum stress the material can withstand before necking; and the modulus of elasticity, a measure of the material's stiffness. It also indicates the elongation at break, representing the total strain the material can undergo before fracturing.

Jännitysvenymäkoe is vital in material science and engineering for material selection, quality control, and research and development. It helps engineers understand how a material will behave under load, ensuring its suitability for specific applications and predicting its service life. Different standards, such as those from ISO or ASTM, define the procedures for conducting these tests to ensure consistent and comparable results across different laboratories and materials.