功能梯度材料活塞三维温度场分析

功能梯度材料零件具有单质材料零件无法比拟的理化性能优势,然而由于材料分布复杂以及对功能梯度材料本身性能研究不充分,功能梯度材料零件性能分析存在很多困难.以陶瓷纤维梯度增强活塞、陶瓷纤维非梯度增强活塞为例,应用复合材料热性能理论,采用有限元分析软件ADINA中的ADINA-T模块和结构分析模块对功能梯度材料活塞和普通活塞的温度场和热流场进行了计算分析,结果表明使用陶瓷纤维梯度层可以明显改变活塞温度分布,降低散热量,缓和由于热膨胀系数不匹配,在陶瓷纤维增强层与活塞本体交界处产生的应力.

Temperature field analysis for heterogeneous material piston

Physical and chemical performance of heterogeneous material part exceeds homogeneous material part.Because of material distributing complexity and insufficient study for heterogeneous material,there are lots of difficult in analysis of heterogeneous material part.Theory of composite performance and ADINAT module of finite element analysis software ADINA were used to compute and analyze temperature field and heat dissipating capacity for heterogeneous material and common piston,using the gradient aluminum matrix composite piston reinforced by ceramic fibers and aluminum matrix composite piston reinforced by ceramic fibers(no grads) as examples.The results show this method can change piston temperature distribution,reduce heat dissipation capacity and relax the stress at interface of gradient aluminum matrix composite layer reinforced by ceramic fibers and piston noumenon which caused by mismatch between different coefficients of thermal expansion,using gradient aluminum matrix composite layer reinforced by ceramic fibers.