Cumulative Damage Hypothesis
The damage accumulation hypothesis sums individual damages under different loads to predict life. It's an important tool for variable loads.
Physical-chemical mechanism of action
The hypothesis is based on the principle that every loading event causes a small amount of damage that accumulates over time. These damages can be mechanical forces, chemical reactions, or thermal changes.
Metallurgical relevance & risks in welding
For the weld, the hypothesis can help identify the risk of microstructural changes and degradation. Incorrect welding parameters or uneven loading can lead to accumulated damage that eventually results in cracking.
Workshop practice & action instructions
To improve the service life of a weld, the following measures should be taken:
• Use suitable welding materials with high toughness and endurance.
• Ensure that welding parameters (temperature, voltage) are set optimally.
• Monitor the loading on the weld regularly and carry out repairs if necessary.