碳纤维复合材料的磨削热分配比仿真研究

Finite element analysis on heat distribution ratio during grinding CFRP

碳纤维增强树脂基复合材料是一种比模量高、比强度高、比刚度高的复合材料,在航空航天领域具有较大的应用前景。磨削由碳纤维和树脂组成的碳纤维增强树脂复合材料时,当磨削温度超过树脂的玻璃化转变温度就会产生树脂烧毁等缺陷。为了研究此问题,利用碳纤维复合材料–康铜丝半人工热电偶在线测量磨削过程中的温度,通过试验与仿真相结合的方法计算出传入工件的热分配比为2.0%～3.5%。

Carbon fiber reinforced plastics possess high specific modulus,specific strength and specific stiffness,which shows great application prospects in the field of aeronautics and astronautics.When grinding carbon fiber reinforced resin composites composed of carbon fibers and resins,the grinding temperature may exceed the glass transition temperature of the resin,leading to resin burn-out and other defects.In order to study this problem,the semi-artificial thermocouple of carbon fiber composite and constantan wire is used to measure the in-situ temperature in grinding process,and the heat distribution between workpiece and others is studied by combining experiment with finite element simulation.It is found that the heat imported to workpiece is 2.0%to 3.5%of the total heat during grinding process.