The thermal-mechanical coupling analysis of diesel engine cylinder head

2011 ◽  
Author(s):  
Guanghui Xue ◽  
Xiangsong Yu
Keyword(s):  
Diesel Engine ◽  
Cylinder Head ◽  
Coupling Analysis ◽  
Mechanical Coupling ◽  
Engine Cylinder

Finite Element Analysis of Diesel Engine Cylinder Head Stress and Deformation with Thermal-Mechanical Coupling

2011 ◽  
Vol 211-212 ◽  
pp. 190-194
Author(s):  
Guang Hui Xue ◽  
Xiang Song Yu ◽  
Pu Sheng Liu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Diesel Engine ◽  
Cylinder Head ◽  
Fuel Injector ◽  
Element Analysis ◽  
Face Surface ◽  
Mechanical Coupling ◽  
Engine Cylinder ◽  
Stress And Deformation

Considering the structure of some diesel engine cylinder head, its 3-D solid model and the finite element model is built, and after the load and constraint of is deal with, the stress and deformation the cylinder head with thermal-mechanical coupling is calculated with FEA ( Finite Element Analysis) software ABQUS. Analysis results find that: (1) the first main stress maximum value of cylinder head is up to 199.6MPa, which is less than 250MPa of the HT250 material ultimate tensile strength; (2) the deformation area is mainly in the flame face surface and fuel injector coxcombing, and the deformation of flame face is general symmetrical broadways and slightly large near the exhaust passage longways, while the deformation of fuel injector coxcombing is general symmetrical broadways and longways; (3) the structure design and strength of the cylinder head satisfy the design requirements.

scholarly journals Failure Analysis of a Modern High Performance Diesel Engine Cylinder Head

2014 ◽  
Vol 6 ◽  
pp. 862853 ◽  
Author(s):  
Bingbin Guo ◽  
Weizheng Zhang ◽  
Xiaosong Wang
Keyword(s):  
Diesel Engine ◽  
Failure Analysis ◽  
Cylinder Head ◽  
High Performance ◽  
Casting Process ◽  
Structure Type ◽  
Maximum Temperature ◽  
Element Analysis ◽  
Mechanical Coupling ◽  
Engine Cylinder

This paper presents a failure analysis on a modern high performance diesel engine cylinder head made of gray cast iron. Cracks appeared intensively at the intersection of two exhaust passages in the cylinder head. The metallurgical examination was conducted in the crack origin zone and other zones. Meanwhile, the load state of the failure part of the cylinder head was determined through the Finite Element Analysis. The results showed that both the point of the maximum temperature and the point of the maximum thermal-mechanical coupling stress were not in the crack position. The excessive load was not the main cause of the failure. The large cooling rate in the casting process created an abnormal graphite zone that existed below the surface of the exhaust passage (about 1.1 mm depth), which led to the fracture of the cylinder head. In the fractured area, there were a large number of casting defects (dip sand, voids, etc.) and inferior graphite structure (type D, type E) which caused stress concentration. Moreover, high temperature gas entered the cracks, which caused material corrosion, material oxidization, and crack propagation. Finally, premature fracture of the cylinder head took place.

Cracking in Cast Iron Diesel Engine Cylinder Heads

1970 ◽  
Vol 185 (1) ◽  
pp. 807-823 ◽  
Author(s):  
L. W. L. Smith ◽  
H. T. Angus ◽  
A. D. Lamb
Keyword(s):  
Cast Iron ◽  
Diesel Engine ◽  
Experimental Work ◽  
Cylinder Head ◽  
Cooling Water ◽  
Test Apparatus ◽  
Directed Flow ◽  
Critical Areas ◽  
Engine Cylinder ◽  
Diesel Cylinder

The nature and mechanism of cracking in cast iron diesel cylinder heads arising from the differential thermal strains which occur in service are reviewed. The results of experimental work with test apparatus simulating the conditions in a cylinder head are presented, illustrating the importance of controlling the boiling conditions of the water at the cooling face of the flame deck. It is concluded that cylinder head temperatures, and therefore the danger of cracking, can be successfully reduced by increasing the flow of cooling water over critical areas by some form of directed flow.

Sign in / Sign up

Export Citation Format

Share Document