The microscopic stresses of the discontinuous fiber reinforced composites under thermal and mechanical loadings have not been intensively studied as they cannot be directly measured. Thus, a finite element simulation associated with a suitable analysis strategy is required to reveal the microscopic stresses of these composite materials, though it is challenging owing to the randomly distributed fibers. In this study, the microscopic stresses in an actual composite are simulated by using finite element method and combining techniques of morphology transformation, massively parallel computing, and edge effect removal. The probability density of the von Mises stress of the resin exhibits a single peak and covers a wide range, following the Burr statistic model regardless of the loading type. The external mechanical loading and material modulus, rather than the thermal loading, are the main factors affecting the probability density. The reason for the appearance of the lower and upper values of the von Mises stress of the resin is also discussed. The characteristics of the discontinuous fiber reinforced composite evaluated in this preliminary study are beneficial to understand the mechanical properties of such new composites.

不连续纤维增强复合材料在热和机械载荷下的微观应力尚未得到深入研究，因为它们无法直接测量。因此，需要与合适的分析策略相关的有限元模拟来揭示这些复合材料的微观应力，尽管由于随机分布的纤维而具有挑战性。本研究采用有限元方法，结合形态变换、大规模并行计算和边缘效应去除技术，对实际复合材料中的微观应力进行了模拟。无论负载类型如何，树脂的 von Mises 应力概率密度均呈现单峰且覆盖范围广，遵循 Burr 统计模型。外部机械载荷和材料模量，而不是热载荷，是影响概率密度的主要因素。还讨论了树脂的von Mises应力出现偏低和偏高的原因。在这项初步研究中评估的不连续纤维增强复合材料的特性有利于了解这种新型复合材料的机械性能。