Yield strength

The yield strength (also known as the elastic limit) is the maximum stress that a material can withstand before it is permanently deformed. It is specified in units of megapascals (MPa) or newtons per square millimeter (N/mm²) and is a critical factor in material selection and testing.

Measurement and determination of the yield strength

The yield point is determined by tensile tests in which a sample of the material is stretched under controlled conditions until plastic deformation occurs. The point at which the material no longer returns to its original shape marks the yield point.

Significance of the yield strength for the design

In mechanical engineering, knowledge of the yield strength is essential to ensure that components can withstand the expected loads. Designers use the yield strength to calculate safety factors and to ensure that structures do not suffer permanent deformation during operation.

Material selection based on the yield strength

Different materials have different yield strengths, which determines their suitability for certain applications. Metals such as steel and aluminum are often selected for their high yield strength and associated strength. The right choice of material based on yield strength can improve the durability and safety of machinery and structures.

Influence of temperature and ambient conditions

The yield strength of a material can be affected by temperature and other environmental conditions. At high temperatures, many materials tend to have a lower yield strength, which must be taken into account when designing high-temperature applications.