短纤维增韧铁硼化合物基复合材料应力研究
Research on Stress in Iron Boron Matrix Composite Reinforced by Short Fiber
李 庆, 李 丹, 张 运, 武建军
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作者单位：(河北工业大学 材料学院, 天津 300130)
中文关键字：铁硼化合物； 短纤维； 有限元； 残余热应力
英文关键字：iron boron; short fiber; finite element method; residual thermal stress
中文摘要：铁硼合金具有较好的耐锌腐蚀性能，但脆性限制了它的工业应用，短切纤维增韧可以有效改善该材料的力学性能。在断口分析基础上，采用双纤维复合材料模型，利用有限元方法计算了复合材料的残余热应力及外力作用时的应力分布。结果表明，纤维中的残余热应力为压应力，基体中为拉应力；随着纤维长径比的增加，残余应力逐渐提高；增加纤维体积分数有利于提高复合材料的抗拉强度。
英文摘要：The iron boron alloy has good corrosion resistance to molten zinc but with poor mechanical property. Toughening treatment with short fiber can effectively improve the mechanical properties of the alloy. On the bases of fracture analysis, adopting double fibers composite model, the residual thermal stress and stress distribution under external force were calculated using finite element method. The results show that the residual stress in fiber is compressive stress but tensile in matrix. With the increase of length-diameter ratio , the residual stress gradually increases. The tensile strength improves by increasing fiber volume fraction