针对薄壁微管拉扭试验中载荷测试的特殊需求,研制了一种基于薄梁拉-弯变形的具有对称一体化结构的高拉扭载荷比复合式传感器.采用有限元法分析了传感器弹性体在拉力、扭矩以及拉扭复合载荷下的应力和应变分布,优化了弹性体尺寸参数、应变片的粘贴位置和检测电路.实验表明,传感器具有结构合理,灵敏度高,刚度大,拉扭耦合小,加工工艺简单,重复性好的特点,实现了高拉扭比试验的高精度载荷测量.%A load cell with large ratio of tensile traction to torque is developed for biaxial tension-torsion test of thinwalled microtubes, which is based on the separation of tensile / bending deformation of 4 symmetrically distributed thin strips, on each of which there is a hole in the middle. The distributions of stress and strain under pure tension,pure torsion and combined tension-torsion are analyzed with FEM ( Finite Element Method) approach. The geometry and the size of each part of the load cell, and the location of strain gages are optimized. Biaxial tension-torsion tests of NiTi shape memory alloy microtubes showed that the load cell is of satisfactory sensitivity and stiffness,low-coupling between torsion and tensile deformation, and can be used in high-precision measurement of load under combined tension-torsion testing.
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