The fracture behavior and fracture mechanism of agricultural machinery aluminum forgings refers to the phenomenon and reason analysis of the fracture of aluminum forgings in the process of use.
The fracture behavior of aluminum forgings can usually be divided into the following situations:
- Fatigue fracture: Under the action of cyclic loading for a long time, aluminum forgings produce tiny cracks, gradually expand to deadly size, and eventually fracture. Common fatigue fracture forms have fatigue cracks originating from the surface, inside or weld.
- Brittle fracture: Aluminum forgings are fractured under conditions such as low temperature or high-speed impact due to stress concentration or the existence of embrittlement factors (such as hydrogen embrittlement). Brittle fracture generally presents a more obvious crack pattern.
- Bending fracture: When aluminum forgings are subjected to bending loading, cracks occur and rapidly expand to fracture due to stress exceeding its failure strength.
The fracture mechanism of aluminum forgings mainly includes the following aspects:
- Material factors: the composition, grain size and grain boundary characteristics of aluminum alloy have important effects on fracture behavior. Different aluminum alloys have different fracture characteristics, such as ductility, brittleness, etc., resulting in different fracture modes.
- Holes and inclusions: the holes and inclusions present in aluminum forgings will form stress concentration points under external load, thus triggering the origin of cracks. These holes and inclusions will reduce the tensile strength and toughness of the material, which will affect the fracture behavior.
- Manufacturing process and heat treatment: The manufacturing process and heat treatment conditions of aluminum forgings will directly affect its fracture behavior. Too high hammering temperature, insufficient holding time, and too fast cooling rate may lead to organizational defects inside aluminum forgings, thereby increasing the risk of fracture.
- External load: The size, direction and loading method of external load also have an important impact on the fracture behavior of aluminum forgings. Exceeding the bearing capacity of aluminum forgings or applying unreasonable mechanical loading may lead to fracture.
In short, the fracture behavior and fracture mechanism of agricultural machinery aluminum forgings is a complex subject, which needs to be analyzed comprehensively considering the material properties, manufacturing process, operating environment and other factors. The fracture toughness and reliability of agricultural machinery aluminum forgings can be effectively improved by reasonable design, selection of high-quality materials and reasonable manufacturing process.
