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提出了一种计算任意形状应力区的光纤在纤芯处的应力场分布和双折射大小的应力微元积分计算方法。采用COMSOL Multiphysics软件中的固体力学模块,研究了矩形、方形、三角形、圆等不同形状微元应力区光纤在纤芯处应力场和双折射的大小。结果表明,应力微元面积相同时,其在纤芯处引起的应力大小及其双折射与应力微元的形状、放置方向无关,只与应力微元到纤芯的距离有关。当应力微元与纤芯距离较近时,应力大小和双折射与距离近似呈平方反比关系。该结果验证了应力微元分析方法的正确性和可行性。因此对应力微元进行积分,即可得到任意形状应力区光纤在纤芯处的应力场分布与双折射。
A method to calculate the integral stress field of fiber with stress field of arbitrary shape stress area and birefringence is proposed. The solid mechanics modules in COMSOL Multiphysics software are used to study the stress field and birefringence of the fiber in rectangular, square, triangular, circle and other micro-stress areas. The results show that the stress size and the birefringence induced by the core are the same as those of the stressed micro-elements, regardless of the shape and orientation of the stress micro-elements. When the stress element is close to the core, the stress magnitude and birefringence are approximately inversely proportional to the square of the distance. The result verifies the correctness and feasibility of the stress microanalysis method. Therefore, the integral stress element, you can get any shape stress zone fiber in the core of the stress field distribution and birefringence.