含裂纹TiB2基陶瓷/42CrMo合金层状梯度材料失效仿真
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陆军工程大学石家庄校区

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TJ3023

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Failure simulation of layered gradient materials of TiB2-based ceramics /42CrMo alloy with cracks
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Shijiazhuang School,Army Engineering University

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    摘要:

    为预报梯度材料中缺陷对材料失效的影响,在以往超重力场合成梯度材料的基础上优化制备的工艺参数,制备出TiB2-TiC-Fe组分呈梯度变化的TiB2基陶瓷/42CrMo合金层状梯度材料。经XRD、SEM观察其梯度层间陶瓷/合金相界呈连续梯度变化。而后在相关参数研究的基础上,通过扩展有限元(XFEM)方法,并基于ABAQUS平台研究了不同预制裂纹水平位置、不同预制裂纹竖直位置、不同预制裂纹长度以及角度对裂纹扩展速率与失效时间的影响。结果表明:预制不同水平位置裂纹对材料裂纹扩展速率影响最为显著;不同裂纹长度主要影响裂纹扩展速度增长率;不同裂纹角度以45°为区分,主要影响裂纹扩展方式和路径。这对于该型材料的损伤预测,具有不小的参考价值。

    Abstract:

    In order to predict the effect of defects on the material failure, the layered TiB2-based ceramics /42CrMo alloy gradient materials were prepared by optimizing the process parameters on the basis of the previous superheavy field synthesis of gradient materials.XRD and SEM were used to observe the continuous gradient change of ceramic/alloy phase boundary between the gradient layers.Then, based on the study of relevant parameters, the effects of different horizontal position, vertical position, length and Angle of the prefabricated crack on the crack growth rate and failure time were studied by the extended finite element (XFEM) method and ABAQUS platform.The results show that the prefabricated cracks at different horizontal positions have the most significant effect on the crack growth rate.Different crack lengths mainly affect the growth rate of crack propagation.Different crack angles are distinguished by 45°, which mainly affected the mode and path of crack propagation.This is of great reference value for damage prediction of the type of material.

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鲁明远,韩保红,赫万恒,等. 含裂纹TiB2基陶瓷/42CrMo合金层状梯度材料失效仿真[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-04-30
  • 最后修改日期:2021-11-05
  • 录用日期:2021-11-10
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