Modulus of elasticity
The elastic modulus indicates how much a material stretches under mechanical stress. A higher modulus means greater stiffness.
Physical-Chemical Mechanism of Action
The elastic modulus (E) is the proportionality factor in Hooke's law, which describes how a material stretches under mechanical stress. It gives the relationship between stress and strain: σ = E · ε, where σ is stress, E is the elastic modulus, and ε is the relative strain.
Metallurgical Relevance & Welding Risks
A high elastic modulus means the material is stiffer. This can lead to increased stress build-up and to cracking or failure under mechanical load. When welding steels with different elastic moduli, stress concentrations can occur, which can lead to hot cracking.
Workshop Practice & Action Guidelines
When welding, it is important that the materials involved have similar elastic moduli. This minimizes stress concentrations and reduces the risk of cracking. When selecting base materials, always consider the specific requirements for the mechanical load capacity of the weld joint.