Browse Publications Technical Papers 920087
1992-02-01

Crankshaft Durability Prediction - A New 3-D Approach 920087

New engines must satisfy conflicting customer requirements of higher performance and better fuel economy. These requirements have led us to more sophisticated analyses of crankshafts which must withstand higher gas forces and higher speeds while reducing their contribution to total engine friction.
To face this challenge, the designer needs improved tools to predict friction, dynamic response and durability. It is the problem of crankshaft durability prediction that will be addressed in this paper.
A new crankshaft durability assessment tool has been developed by RENAULT, based on a completely 3-D mechanical analysis. Each step of ‘classical’ durability assessment has been improved. Load calculations include rotating external bearing loads, torsional vibrations and internal centrifugal loads. Stress calculations involve initial 3-D FEM analysis followed by a local BEM fillet zoom technique. Fatigue prediction is made using the multiaxial Dang Van criterion, and fatigue data are obtained through full scale materials testing consistent with the calculation tool.
This new tool allows the designer to optimize a crankshaft more quickly and with more precision than in the past. As an illustration, the design of a 1.9 liter turbocharged diesel engine crankshaft is presented.
Some discussion of remaining difficulties in fatigue life assessment, such as flywheel whirl or statistical aspects of fatigue are also developed in this paper.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Development of High Wear Resistant and Durable Coatings for Al Valve Spring Retainer

2007-01-1748

View Details

TECHNICAL PAPER

Diesel engine connecting rod bolted joint opening analysis with analytic and finite element models

2010-36-0244

View Details

TECHNICAL PAPER

APPLICATIONS OF ALUMINUM in DIESEL ENGINES

400174

View Details

X