-
Optimization and Finite Element Analysis of Single Cylinder Engine Crankshaft for Improving Fatigue Life
Muse Degefe,
Prabhu Paramasivam,
Tamana Dabasa,
Venkatesh Kumar S.
Issue:
Volume 1, Issue 3, September 2017
Pages:
58-68
Received:
3 April 2017
Accepted:
21 April 2017
Published:
26 June 2017
DOI:
10.11648/j.ajmme.20170103.11
Downloads:
Views:
Abstract: Crankshaft is large volume production component with a complex geometry in internal combustion Engine (ICE), which converts the reciprocating displacement of the piston into a rotary motion of the crank. An effort was done in this paper to improve fatigue life for single cylinder engine crankshaft with geometric optimization. The modeling of the original and optimized crankshaft is created using SOLIDWORK Software and imported to ANSYS software for analysis. Finite element analysis (FEA) was performed to obtain maximum stress point or concentrated stress, to optimize the life of crank shaft by applying the boundary conditions. The maximum stress appears at the fillet areas between the crankshaft journal and crank web. The FE model of the crankshaft geometry is meshed with tetrahedral elements. Mesh refinement are done on the crank pin fillet and journal fillet, so that fine mesh is obtained on fillet areas, which are generally critical locations on crankshaft. The failure in the crankshaft initiated at the fillet region of the journal, and fatigue is the dominant mechanism of failure. Geometry optimization resulted in 15% stress reduction and life is optimized 62.55% crankshaft which was achieved by changing crankpin fillet radius and 25.88% stress reduction and life is optimized 70.63% of crankpin diameter change. Then the results Von-misses stress, shear stress and life of crankshaft is done using ANSYS software results. It was concluded from that the result of geometric optimization parameter; like changing crankpin fillet radius and crankpin diameter were changes in model of crankshaft to improve fatigue life of crankshaft.
Abstract: Crankshaft is large volume production component with a complex geometry in internal combustion Engine (ICE), which converts the reciprocating displacement of the piston into a rotary motion of the crank. An effort was done in this paper to improve fatigue life for single cylinder engine crankshaft with geometric optimization. The modeling of the or...
Show More
-
Failure Investigation of an In-service Steam Boiler
Okpala Alexander Nwachukwu,
Burubai Woyengi-Ebinipre
Issue:
Volume 1, Issue 3, September 2017
Pages:
69-77
Received:
25 April 2017
Accepted:
25 May 2017
Published:
10 July 2017
DOI:
10.11648/j.ajmme.20170103.12
Downloads:
Views:
Abstract: Failure investigation was carried out on a refinery steam boiler had a history of good performance with few leakages and damages that were successfully weld repaired. The steam boiler tubes were observed to have developed several perforations / punctures on numerous furnace chamber tubes, twenty two years after commissioning. In the course of the investigation, background data and history of failure were collected with available photographic evidences, visual examination, low magnification examination, chemical analysis, SEM analysis, EDS analysis, macrostructure examination, microstructure examination, tensile test hardness and micro-hardness tests. It was concluded that the failure of the tubes were due to upsets in the water chemistry that has promoted caustic gouging from ID at localized places. Adjustments to boiler water chemistry which should be made to maintain strict congruent phosphate pH control was then recommended.
Abstract: Failure investigation was carried out on a refinery steam boiler had a history of good performance with few leakages and damages that were successfully weld repaired. The steam boiler tubes were observed to have developed several perforations / punctures on numerous furnace chamber tubes, twenty two years after commissioning. In the course of the i...
Show More
-
Influence of Na2SO4 on the Mechanical Properties of High Volume Calcined Clay Pozzolan Cement
Kwabena Appiah Boakye,
Albert Amartey Adjaottor,
Trinity Ama Tagbor,
Delali Adjei
Issue:
Volume 1, Issue 3, September 2017
Pages:
78-82
Received:
4 May 2017
Accepted:
18 May 2017
Published:
13 July 2017
DOI:
10.11648/j.ajmme.20170103.13
Downloads:
Views:
Abstract: Calcined clay pozzolan, the major mineral admixture used in Ghana to partially substitute ordinary Portland cement has gained massive recognition in the local construction industry because of its technical advantages and affordability. The most prominent undesirable property associated with the use of calcined clay pozzolans is slow setting and strength development, especially at early ages. This paper presents a study of the effect of Na2SO4 on the mechanical properties of high volume pozzolan cements. The cements containing 30 wt. %, 40 wt. %, 50 wt. % and 60 wt. % calcined clay pozzolan was activated with 1%, 2%, 3% and 4% Na2SO4. Some physical properties such as Blaine index, specific gravity, water demand and setting times were determined. The chemical compositions of the blended cements were also analyzed. The effect of Na2SO4 on compressive strength of blended cements was determined after 2, 7, 28 and 180 days. Durability studies on activated blended cements in aggressive media were also conducted. Activation with a minimum of 2% Na2SO4 improved the 2 days compressive strength of cement containing 60% calcined clay pozzolan by 66.2% and caused it to behave as Class 32.5N cement, at 28 days. As Na2SO4 dosage increased, compressive strength also increased. The optimum Na2SO4 dosage was 2%. Activated blended cements resisted MgSO4 environment better than unactivated cements
Abstract: Calcined clay pozzolan, the major mineral admixture used in Ghana to partially substitute ordinary Portland cement has gained massive recognition in the local construction industry because of its technical advantages and affordability. The most prominent undesirable property associated with the use of calcined clay pozzolans is slow setting and str...
Show More
