1 部分挠度方法的提出目前,试验室都采用图1或图2所示的全挠度方法测金属材料弯曲力学性能。这种方法是测定试样在弯曲负荷下其跨距中点的挠度。试验时挠度计必须安装在试验机横梁或弯曲装置的基座上。所测挠度受试验机或弯曲装置的柔性影响。尤其当测定残余弯曲应力(例如σ_(rb0.01),要求挠度计不但精确度要 1 partial deflection method proposed At present, the laboratory adopts the full deflection method shown in Figure 1 or Figure 2 to measure the bending mechanical properties of metal materials. This method is to measure the deflection of the mid-span of the specimen under bending load. The test fixture must be mounted on the base of a tester beam or bending device. The measured deflection is affected by the flexibility of the test machine or bending device. Especially when the residual bending stress (eg σ_ (rb0.01)) is measured, it is required that the deflection meter not only have the accuracy