In mechanical manufacturing, general machinery parts are in normal temperature, normal pressure and not used in strong corrosive medium, moreover in the process of using all the mechanical parts will be under different load. Mechanical property refers to the metal materials under the action of load resistance damage property. So the mechanical property is metal material commonly used indicator of a collection.
Metal material mechanical property is good or bad, determine its use scope and life. In design and material selection of parts, can in accordance with metal material mechanical property. Of course, plus load nature is different (such as stretch, compression, torsion, impact and cyclic load, etc.), the mechanical property of metal material requirements will also be different.
Often say a kind of metal mechanical property is not good, refers to it easy to fold, break, or if there’s not a good grind ductility. General pure metal mechanical strength will be weak alloy strength, such as the property of the steel is better than aluminum alloy. Commonly used mechanical property includes: strength, hardness, stiffness, elasticity, plasticity, fatigue strength, impact toughness and fracture toughness, etc.
Strength: metal material under external force, has resist plastic deformation and fracture ability.
Hardness: metal material under external force, has resist tougher thing press-in metal material ability.
Stiffness: metal material under stress force can resist to elastic deformation ability.
Elasticity: metal material under external force generated deformation, when the external force after remove to restore its original shape ability.
Plasticity: metal material under the action of external force, produce permanent deformation without causing damage ability.
Fatigue strength: metal material under the action of countless times repeated alternating load without causing the breakage biggest stress.
Impact toughness: metal material under the action of resist to impact load breakage ability.
Fracture toughness: used to reflect the material to resist crack instability expansion ability property indicator.