Failure analysis of the exhaust valve stem from a Waukesha P9390 GSI gas engine

Kwon, Oh Geon; Han, Moon Sik

doi:10.1016/j.engfailanal.2003.05.015

Cited by 20 publications

(6 citation statements)

References 1 publication

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“…Износ и выход из строя клапанов влечёт за собой проблемы для двигателя: снижение производительности, а также высокие затраты на ремонт. Анализ автора Kwon OG показал, что основными причинами отказов клапанов являются: • термические и механические напряжения, в связи с чем происходит потеря твёрдости основного металла; • сильное окисление поверхности, что приводит к истиранию рабочих поверхностей тарелки клапана и седла [1]. Впускные клапаны выходят из строя намного реже, чем выпускные, т. к. тарелка впускного клапана остаётся более холодной за счёт обдува её холодным впускным зарядом, в случае с выпускным -температура тарелки находится в пределах 500…700 ℃, но в некоторых экстремальных условиях (при перегрузке двигателя или неправильном режиме работы) температура выпускного клапана может значительно превышать эти значения.…”

Section: введение виды изнашивания и причины разрушения клапановunclassified

“…Из-за таких высоких температур, при неправильном выборе материала во время проектирования он теряет свои механические свойства: пластичность и прочность. Поэтому необходимо применять технологии, позволяю щие создавать новые покрытия на тарелке клапана с высокими механическими свойствами и эффективной теплопередачей к седлу и к головке блока цилиндров [1,2].…”

Section: введение виды изнашивания и причины разрушения клапановunclassified

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Increasing the wear resistance of the ICE’s valves with the laser cladding method

Zavitkov,

Loktev,

Lyukhter

2023

Izvestiya MGTU MAMI

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BACKGROUND: There is plenty of factors leading to failure and expensive repair of piston engines at their operation. One of the widespread factors capable of affecting the engine operation is combustion chamber sealing failure. During the engine operation, gases combusting in a chamber bring pressure on working surfaces of a valve and a valve seat. If these surfaces do not ensure sealing, exhaust gases begin to leak in the exhaust manifold untimely, in some cases in the intake manifold as well. In addition, filling of cylinders with inlet charge worsens. In majority of cases, combustion chamber sealing failure caused by defect formation at working surfaces of the valve — valve seat coupling. In order to avoid combustion chamber sealing failures and other issues of operation of piston engines, it is necessary to minimize working surfaces wearing by means of wear-resistant coating. AIMS: Wear- and corrosion-resistant coating of valve’s working surface to increase service life. METHODS: The factors affecting the reliability of the valve — valve seat coupling were defined by means of literary sources analysis. Laser cladding at the valve’s chamfer was conducted with the laser robotized facility based on ytterbium fiber laser. Quality of the coated surface at the valve’s working chamfer was defined by means of metallographic study and liquid penetrant test. RESULTS: After laser cladding of the PR-08Kh17N8S6G powder material at the valve’s working chamfer, the uniform coated surface with microhardness of 435–485 HV (44–48 HRC) was obtained. CONCLUSIONS: The study results may be used for development and implementation of new kinds of wear-resistant surfaces that make it possible to increase the service life and to repair worn-down surfaces of components.

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Section: введение виды изнашивания и причины разрушения клапановunclassified

Increasing the wear resistance of the ICE’s valves with the laser cladding method

Zavitkov,

Loktev,

Lyukhter

2023

Izvestiya MGTU MAMI

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“…Indeed, according to some fractographic studies, it was concluded that the fatigue damage is the dominant mechanism of failure of exhaust valves. 9,10 Contrariwise, many researchers tried to establish analytical studies or/and Finite Element Method (FEM) models that describes the thermal load within valves. Woschni et al 11 used correlation to estimate instantaneous spatially averaged Heat Flux Coefficient HTC within the combustion face.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, according to some fractographic studies, it was concluded that the fatigue damage is the dominant mechanism of failure of exhaust valves. 9,10…”

Section: Introductionmentioning

confidence: 99%

Thermo-mechanical stress analysis within a steel exhaust valve of an internal combustion engine

Fersaoui

Cerdoun

May

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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The valves of an internal combustion engine play an essential role in the automobiles and their surroundings significantly affect their thermo-mechanical behavior. The work aims to assess numerically the effect of the real thermo-mechanical boundary conditions on the valves by considering the actual complex surrounding. For this purpose, we have subdivided the valve into seven adequate zones. We have evaluated the average values of the transient heat transfer coefficient, the adiabatic wall temperature and the mechanical load at each subdivision are during the opening and the closing periods. A transient Finite Element Model under ANSYS APDL software is developed and simulations are carried out until reaching the steady state. The temperature distribution and the thermal stresses at each valve position is obtained and then analyzed. The main findings show that the stress intensity distribution is developed in the zones labelled stem guide port and seat local of large temperature gradients, which causes high thermal stresses responsible of cracks or thermal fatigue damage. In addition, knowing the temperature map, the thermal gradient and stress under actual conditions will surely help manufacturers to better design exhaust valve, avoid early failure and enhance the durability of valves.

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“…The results showed that due to high temperature the austenitic matrix decomposed to form the lamellar structure consisting of ᵞ+Cr 23 C 6 at the boundary which decrease the strength, toughness, hardness and gas corrosion resistance of plate material of valve responsible for failure of exhaust valve. Kwon and Han [3] presented a failure analysis of the exhaust valve stem in a gas engine. They showed the failure was a result of overheating of the valve.…”

Section: Introductionmentioning

confidence: 99%

Failure Analysis of Diesel Engine Exhaust Valve by Using Ansys Software

Yadav

Mittal

Angra

2014

AMM

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The failure of valve affects the engine performance and as a result importance is given to the failure analysis of internal combustion engine valves. The valve may fail by valve face recession, wear failure, fatigue failure, thermal fatigue, erosion / corrosion of valves, overheating of valves and carbon deposits on valves. Mostly valves fail due to high pressure and temperature. This paper presents a failure analysis of diesel engine exhaust valve used in a passenger car. The analyzed exhaust valve failed after a very short period of usage of the car. To determine the cause of failure stress analysis is carried out by finite element method which shows the highly stressed region on the valve. A proper CAD model is developed by using CATIA software and saved in 'iges' format. It is then imported into ANSYS 14 software which gives the von mises stress, strain and deformation. The stress analysis shows that maximum stress is developed near the head of valve when piston crashed to the valve and material analysis shows that the strength of valve decreases due to decarburization of material and as a result the valve was bent.

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Failure analysis of the exhaust valve stem from a Waukesha P9390 GSI gas engine

Cited by 20 publications

References 1 publication

Increasing the wear resistance of the ICE’s valves with the laser cladding method

Increasing the wear resistance of the ICE’s valves with the laser cladding method

Thermo-mechanical stress analysis within a steel exhaust valve of an internal combustion engine

Failure Analysis of Diesel Engine Exhaust Valve by Using Ansys Software

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