低碳钢拉伸力学性能实验low carbon steel‘s tension test
仪器
万能材料试验机universal testing machine
游标卡尺vernier
低碳钢试样Low carbon steel sample
L=5.65*Aˆ0.5
测量值
下屈服强度yield strength
抗拉强度tensile strength
步骤
测量试样尺寸measure sample
准备试验机prepare the testing machine
安装试样install the sample
预拉pre-load to check if everything is all right
加载gradually add load，until it broken
测定measure
求两次断面直径section diameter
扭转实验torsion test
仪器
扭转试验机torsion testing machine
游标卡尺vernier
试样sample
测量值
切变模量shear modulus
剪切屈服极限shear yield strength
因为有大变形，截面逐渐变为塑性形变because of huge distortion，section is part by part gradually change into plastic distortion
低碳钢、铸铁扭断规律low carbon steel ／casting steel‘s twist off phenomenon
步骤
弯曲正应力实验normal stress experiment under pure bending force
仪器
简易加载设备loading equipment
数字电阻应变仪Digital resistance strain gauge
钢梁iron beam
测量值
纯弯曲正应力分布normal stress distribution under pure bending force
步骤
应变仪调零zero setting of strain gauge
联接应变片connect the strain gauge
加载，读数loading，reading number
弹性模量和泊松比的测定elasticity modulus and poisson ratio’s measure
仪器
万能材料试验机universal testing machine
数字电阻应变仪Digital resistance strain gauge
试样sample
测量值
弹性模量、泊松比Elastic modulus、poisson ration
步骤
应变仪调零zero setting of strain gauge
联接应变片connect the strain gauge
加载，读数loading，reading number
画图，求斜率plot，calculate slope
