【摘要】 分别基于最大拉应力点和最大压应力点建立了三元硼化物金属陶瓷硬质覆层材料覆层受压时的等效抗弯强度理论模型,并进行了实例和试验研究。理论分析与试验研究结果相符,二者均表明随着覆层厚度比的增加,三元硼化物金属陶瓷硬质覆层材料的等效抗弯强度增大;对于本文研究的硬质覆层材料,覆层受压时材料首先在最大压应力位置失效。提出对该硬质覆层材料零件进行结构设计时,如果覆层受压,应以覆层部分材料的抗压强度而不是基体材料的抗拉强度作为设计准则。更多还原

【Abstract】 Theoretical models of equivalent bending strength of ternary boride cermet cladding material when the clad is under press condition are built based on the position of the maximum extension stress and that of the maximum press stress respectively. Example and experiment researches are carried out. Theoretical results agree with experimental ones. Both results show that, the equivalent bending strength of the ternary boride cermet cladding material increases with the growth of clad thickness ration; to the hard cladding material studied in the paper, the failure first occurred at the position of the maximum press stress. To the same cladding material part under the same condition, a principle that the press strength of the material of the clad, but not the extension strength of the substrate material should be as the design criterion is proposed.更多还原