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一、钢材的机械性能材料在外力作用下表现出来的特性叫作材料的机械性能,也称为力学性能。钢材的重要机械性能指标有: 1.强度——物体在外力作用下,抵抗产生塑性变形和断裂的特性。常用的特性指标有屈服极限(σ_s)和强度极限(σ_b),系由拉伸试验获得。 (1)屈服极限材料承受载荷时,当载荷不再增加而仍继续发生塑性变形的现象叫做“屈服”。开始发生屈服现象(即开始出现塑性变形)时的应力叫做“屈服极限”或“屈服点”。工程上取试样发生0.2％残余变形时的应力值作为条件屈服极限,通常
First, the mechanical properties of steel The material under the action of external force is characterized by the mechanical properties of the material, also known as mechanical properties. The important mechanical properties of steel are: 1. Strength - the object under the action of external forces, resistance to plastic deformation and fracture characteristics. Commonly used characteristic indexes are the yield limit (σ_s) and the strength limit (σ_b), obtained from the tensile test. (1) yield point material under load, when the load does not increase and continue to plastic deformation phenomenon is called “yield.” The stress at the onset of yield (ie, the onset of plastic deformation) is called “yield point” or “yield point.” Engineering samples taken 0.2% residual stress deformation stress as a conditional yield limit, usually