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基于宏观尺度三维细观模型，结合多纤维显式建模，研究钛基复合材料(TMCs)三点弯曲中的应力传递机制及纤维含量和偏轴角度的影响规律。结果表明：弯曲载荷下应力应变呈3区分布，0°层纤维承担78.8%轴向应力，90°层基体主导载荷传递并伴随泊松效应，压头下方基体形成空心椭圆形塑性区，层间剪切应力呈“八”字型分布；纤维体积分数增加显著提升弯曲强度，主、次受力层轴向应力线性增大且纤维承担的轴向应力提高，并引发纤维交叉点处轴向应力突变，同时次受力层垂直方向应力增强促使高应力区扩展，层间剪切应力梯度加大；主受力层纤维偏轴导致强度及轴向应力非线性下降，层内剪切应力激增且分布由对称转为波浪式，次受力层承担应力比例与面内剪切梯度增大，层间剪切应力由双峰分布演变为边缘单峰，而次受力层纤维偏轴仅小幅增加强度，其影响程度显著弱于主层发生纤维偏轴。
Abstract：Based on a macroscopic three-dimensional mesoscopic model and combined with multi-fiber explicit modeling, the stress transmission mechanism and the influence laws of fiber content and axial deviation angle in the three-point bending of titanium matrix composites(TMCs) were studied. The results show that under the bending load, the stress and strain are distributed in three zones. The fibers in the 0° layer bear 78.8% of the axial stress, while the matrix in the 90° layer mainly transmits the load and is accompanied by the Poisson effect. A hollow elliptical plastic zone is formed in the matrix below the indenter, and the interlayer shear stress is distributed in an “八” shape. The increase in the volume fraction of fibers significantly enhances the bending strength. The axial stress in the primary and secondary stress layers linearly increases, and the axial stress borne by the fibers rises, causing abrupt change in axial stress at the fiber intersections. Meanwhile, the enhancement of the vertical stress in the secondary stress layer promotes the expansion of the high-stress zone and the increase of the interlayer shear stress gradient. The axial deviation of fibers in the main stress layer leads to the nonlinear decrease of strength and axial stress. The shear stress within the layer surges and its distribution changes from symmetrical to wavy. The proportion of stress borne by the secondary stress layer and the in-plane shear gradient increase. The interlayer shear stress changes from a bimodal distribution to a single peak at the edge. However, the axial deviation of fibers in the secondary stress layer only slightly increases the strength, and its influence is significantly weaker than that of the fiber axial deviation in the main layer.
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基本信息:
中图分类号:TB333
引用信息:
[1]周斌,周子民,王敏涓,等.SiC_f/钛基复合材料弯曲变形力学行为的多尺度数值模拟[J].塑性工程学报,2026,33(08):280-294.
基金信息:
稳定支持项目(2019-363)
2026-08-21
2026-08-21
2026-08-21