The analysis of fracture behavior and fracture mechanism of copper forgings of agricultural machinery is an important work to understand the possible fracture situation and the root cause of the fracture. The following will introduce the common fracture behavior of agricultural machinery copper forgings and the corresponding fracture mechanism analysis.
- Fracture behavior:
The following fracture behaviors may occur in copper forgings of agricultural machinery during operation:
- Fatigue fracture: Under long-term cyclic load, agricultural copper forgings gradually accumulate damage inside the material due to the repeated fluctuations of the load, and eventually lead to fracture.
Static fracture: When agricultural copper forgings bear too much static force or external impact, it exceeds its strength limit, causing destructive fracture. - Corrosion fracture: Agricultural copper forgings exposed to harsh environments, such as wet, acidic or alkaline media, will be corroded, resulting in fracture.
- Fracture mechanism analysis:
The fracture behavior of copper forgings of agricultural machinery can be analyzed through the following main fracture mechanisms:
- Fatigue fracture mechanism: Cracks will occur and expand in copper forgings of agricultural machinery under repeated loading for a long time. This is caused by factors such as stress concentration, internal defects of the material and the inhomogeneity of the microstructure. When the crack gradually expands to a certain length, it eventually leads to fracture. The fracture surface often presents typical river-bed characteristics.
- Static fracture mechanism: When agricultural copper forgings bear too much static force or external impact, it may lead to tensile, shear or extrusion damage. According to the morphology of the damaged surface, it can be judged that the fracture is plastic fracture, ductile fracture or brittle fracture. The plastic fracture usually shows notch and necking effect, the ductile fracture shows smooth fracture surface, and the brittle fracture shows obvious grain fracture or shear zone.
Corrosion fracture mechanism: When agricultural copper forgings are subjected to corrosion for a long time in a harsh environment, corrosion pits will occur on the surface of the material, and gradually expand, and eventually lead to fracture. Corrosion reduces the strength of the material and produces stress concentration, which further accelerates the occurrence of fracture. Corrosion fracture surface often presents smooth and soft characteristics similar to ductile fracture.
In order to study the fracture behavior and fracture mechanism of copper forgings of agricultural machinery, it is necessary to analyze the actual conditions of use, mechanical properties of materials, load analysis and other factors. The fracture behavior and mechanism of agricultural machinery copper forgings can be understood more comprehensively by means of fracture morphology and fracture surface observation, fracture test, impurity analysis, metallographic microscope observation, etc., which can provide scientific basis for its design improvement and material selection, and improve its durability and reliability. At the same time, reasonable preventive measures, such as reasonable stress design, material surface treatment, corrosion protection, etc., are also important means to effectively reduce the risk of fracture.
