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在工件表面特征点粘贴电阻应变片,用应变仪测试局部应力-应变的静态或动态值变化的研究方法,检测结构架、结构梁、结构件局部应力集中分布情况,确定安全使用条件或年限,是比较成熟的技术。对于无缝气瓶等对称性很强的回转体容器,其原材料是标准管材,通过冲压或拉拔加工而形成。这类产品应力集中处较少,圆形或球形轮廓对称性强,每个个体的形状各处差异不大。采用二维电测法直接获得构件表面的应力分布(二维),进而借助于厚壁容器理论的应变-位移计算法及材料理论,推导获得三维容积的变化。通过理论分析,大量试验对比的实践,数据十分贴合,证实了该法可用于CNG钢瓶的容积残
Strain resistance strain gauges are pasted on the surface features of the workpieces, and local or regional stress concentration distributions of the structural frame, structural beams and structural members are tested by using the strain gauge to test the static or dynamic change of local stress-strain, and the conditions or years of safe use are determined. Is a more mature technology. For symmetrical seamless cylinders and other rotating body container, the raw material is a standard pipe, formed by stamping or drawing. Such products less stress concentration, round or spherical contour symmetry, the shape of each individual is not different everywhere. The two-dimensional electric measurement method is used to directly obtain the stress distribution (two-dimensional) of the component surface. Then the variation of the three-dimensional volume is derived by means of the strain-displacement calculation method and the material theory of the thick-wall container theory. Through theoretical analysis, a large number of experimental comparison of the practice, the data is very fit, confirmed that the method can be used for CNG cylinder volumetric residue