光纤光栅在等强度悬臂梁均匀应变区的转换与有限元分析

The change of fiber Bragg grating in uniform strain zones and finite element analysis

等强度悬臂梁作为力学传感器的关键转换元件,不同尺寸和材料的悬臂梁,其自由端的挠度和作用力的量程及光纤光栅的最大微应变也不同。采用光学测量中的基本元件光纤光栅及等强度悬臂梁为模型基础,设计模型平面节点坐标有六个,平面节点坐标可以改变等强度悬臂梁的尺寸,模型厚度依次设置为0.005m、0.010m、0.015m、0.020m、0.030m。对初始尺寸,厚度为0.005m,材料选择为碳素钢的悬臂梁的仿真,结果表明,光纤光栅工作在均匀应变区时,其自由端挠度的量程为0~2.767×10-2 m,作用力的量程为0~437N,光纤光栅的最大微应变为171με。

Uniform strength cantilever beam has a wide application in the field of strain and sensor,with different size and materials.It also has a different range of deflection,force and microstrain.The basic model is made up of fiber Bragg grating in optical measurement component and uniform strength cantilever beam.The model has 6plane coordinates.The size of uniform strength cantilever beam can be changed by plane coordinates.The designed thicknesses of the model are0.005 m,0.010 m,0.015 m,0.020 m,0.030 m.The initial size of thickness is 0.005 m and the initial material is carbon steel,with the simulation of initial model.When fiber Bragg grating works in uniform strain zones,the range of deflection is 0~2.767×10^-2 m,the range of force is 0~437Nand the maximum of microstrain is 171.