TiB2/42CrMo连续梯度材料力学分析与结构设计

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组分呈连续梯度变化的TiB2/42CrMo复合材料。经XRD、SEM观察其梯度层间陶瓷/合金相界呈连续梯度变化。通过硬度测试,得出硬度自陶瓷部分至金属部分呈梯度递减变化,中间梯度层的弹性模量变化形式更趋近于三角函数。在相关参数提取研究的基础上,建立层状强度解析模型。之后采取ANSYS有限元仿真的方法,模拟分析了在施加外部位移载荷的条件下,层状模型的正应力与切应力分布,得出了梯度材料底部金属所承受的最大拉应力为造成该型材料损伤失效的主要原因,与实际材料的三点弯曲实验现象相对应。最后通过研究材料长厚比对应力分布的影响,得出在一定的尺度范围内,梯度材料的力学性质不会随长厚比的增大而线性无限增大,对下一步工程材料设计具有一定指导意义。

TiB2/42CrMo continuous gradient material mechanics analysis and structure design

In previous superheavy force field gradient materials on the basis of optimizing the process parameters of preparation, we prepared TiB₂-TiC-Fe component a continuous gradient variation of TiB2/42CrMo composite materials.By XRD, SEM observation of the gradient layer of ceramic/metal alloy phase boundary between a continuous gradient variation.Through hardness testing, the hardness of the ceramic to metal parts are diminishing gradient change, the elastic modulus variation of intermediate gradient layer form closer to trigonometric functions.In the related parameters based on the study of the extraction, laminar strength analytical model is established.After adopting ANSYS finite element simulation method, the simulation analysis of the displacement in applying external loading conditions, a layered model of normal stress and shear stress distribution, the gradient materials is obtained at the bottom of the maximum tensile stress of the metal on the type of material damage, the main reasons for the failure and the actual material corresponding to the three point bending experiment phenomenon.Finally, research materials long thick ratio on the stress distribution, it is concluded that in a certain scale, gradient material mechanical properties not increases with the increase of the ratio of long thick linear infinite, for engineering materials design has certain guiding significance to the next.