Impeller causes fatigue crack or even fracture
Most causes of fracture and cracking of the blade wheel spindle is caused by defects in material and manufacturing the material such as internal impact toughness of pores, slag, crack, material value and lower plasticity, rough machining, blade wheel key assembly caused by improper local stress is too large. In addition, the long-term excessive alternating stress and thermal stress can lead to the development of micro defects in the material, resulting in fatigue cracks and even fracture.
For example: 1, crack, stress or material in the environment (or both) under the action of the crack; 2, crack; 3, porcelain in the firing to make the crack like pattern; 4, GB-T232-1988 metal bending test method: micro crack length is less than 2mm, width less than 0.2mm; crack length; 2-5mm 0.2-0.5mm, width; crack length is greater than 5mm, the width is greater than 0.5mm; crack: crack width on the whole. There are different materials such as crack distinction.
An impeller is a disk with a moving blade and is part of the rotor of an impulse turbine. Also refers to the wheel and the installation of its rotating blades on the floorboard. Impeller classification: semi open impeller, open impeller.
Most of the defects on the material and manufacturing, such as material impact toughness of pores, slag, crack, material value and lower plasticity, rough machining, blade wheel key assembly caused by improper local stress is too large. In addition, the long-term excessive alternating stress and thermal stress can lead to the development of micro defects in the material, resulting in fatigue cracks and even fracture.
