内燃机工程2017，Vol.38Issue(1)：94-101,8.DOI:10.13949/j.cnki.nrjgc.2017.01.016
缸盖-缸垫-机体热弹性接触问题研究
Study on Thermoelastic Contact of Cylinder Head-Cylinder Head Gasket-Engine Block
摘要
Abstract
In order to study the influence of mechanical constraints and thermal state on thermoelastic contact nonlinear problem that between cylinder head and cylinder head gasket, a four-body contact simplified model of cylinder head-cylinder head gasket-engine block-bolts was built based on a four-valve diesel engine.Under different bolt preload and thermal state, contact state and deformation of cylinder head plate were calculated by using Augmented Lagrange multipliers as the contact algorithm.Then the influence of contact stresses and nodal displacements of mechanical constraints on some parts of the cylinder head plate were revealed in rated thermal state condition.Moreover the effect of different thermal state on the results was similarly revealed.The study makes clear that, when preload maintains the rated value and burst pressure is exerted, contact stresses in rated thermal state condition of the parts on cylinder head plate that against the cylinder ring and around the screw, which is on exhaust valve side, are similar with those values in cold state, while nodal displacements are reduced, and in different thermal states, the rates of change among the nodal displacements around the screw and both contact stresses and nodal displacements that against the cylinder ring are all less than 2%;with few exceptions, contact stresses and nodal displacements of these parts of the cylinder head plate increase with the increases of the bolt preload.The results also show that cylinder head gasket sealing tests in normal temperature condition is roughly adequate to practical state.关键词
内燃机/机械约束/缸盖/简化模型/接触应力Key words
IC engine/mechanical constraints/cylinder head/simplified model/contact stress分类
能源科技引用本文复制引用
冯燕,俞小莉,尹旭,陈晓强,刘震涛..缸盖-缸垫-机体热弹性接触问题研究[J].内燃机工程,2017,38(1):94-101,8.基金项目
国家"八六三"高技术研究发展计划项目(2012AA111709) （2012AA111709）
国家"九七三"重点基础研究发展计划项目(2011CB707205) （2011CB707205）
浙江省教育厅2015高等学校访问工程师校企合作项目 （）
