夹杂强度对复合材料复杂度的影响研究

发布时间：2018-03-01 11:08

  本文关键词： 工程力学 泛形裂纹 复杂度 穿夹杂 沿夹杂　出处：《兵工学报》2016年S1期 　论文类型：期刊论文

【摘要】：研究夹杂强度对复合材料复杂度的影响机理和规律。采用ABAQUS软件及基于扩展有限元的粘性片段方法对复合材料的裂纹扩展进行了数值模拟,得到不同夹杂断裂韧性材料的泛形裂纹构形,并用计盒维数计算其复杂度。计算结果表明,随夹杂强度的增大,材料断裂模式由穿夹杂转为沿夹杂破坏,使泛形断裂面复杂度增加。复杂度的增加呈现剧烈增长和缓慢增长两个阶段,两个阶段的临界值与材料由穿夹杂断裂向沿夹杂断裂的临界值相符。不同最大夹杂尺寸的同一尺寸试件的复杂度随夹杂尺寸增大而增大。
[Abstract]:The mechanism and regularity of the influence of inclusion strength on the complexity of composites are studied. The crack growth of composites is numerically simulated by using ABAQUS software and viscous fragment method based on extended finite element method. The panoramic crack configurations of different inclusion fracture toughness materials are obtained, and the complexity is calculated by box-counting dimension. The results show that the fracture mode of materials changes from inclusion to inclusion failure with the increase of inclusion strength. Increase the complexity of the panoramic fracture surface. The increase of complexity presents two stages: violent growth and slow growth. The critical values of the two stages are consistent with the critical values of the material from the penetrating inclusion fracture to the inclusion fracture along the inclusion. The complexity of the same size specimen with different maximum inclusion sizes increases with the increase of the inclusion size.
【作者单位】： 北京理工大学爆炸科学与技术国家重点实验室;
【基金】：国家自然科学基金项目(11221202)
【分类号】：O346;TB33
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本文编号：1551661