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Technical Paper

A Study on the Cyclic Plastic Zone Size Method, ω*, for Digital Fatigue Life Prediction of Arc-Welded Joints

Various prediction methods have been proposed for evaluating the fatigue life of welded joints by combining finite element analysis (FEA) with an experimental database. However, to obtain more universal and accurate fatigue life predictions, it is necessary to have criteria for making integrated evaluations of the fatigue strength of welded joints. This paper presents a study that focuses on the local cyclic plastic zone size (ω*) as the criterion of fatigue strength and investigates its validity. The definition of ω* was given by the relationship between the stress state at the notch tip and the elastic strain which was defined along the strain-life fatigue curve (ε - N diagram) of a base metal. As a result of using ω*, it was found that an integrated fatigue life prediction was possible to a certain extent for notch and arc-welded joint specimens.
Technical Paper

Application of FEM and Evaluation Method for Connecting Rod Design

A structural analysis for the connecting rod was performed in consideration of bearing crush, oil clearance and initial deformation of the big end bore caused by tightening force of the rod bolts. This analysis enabled to calculate not only the bearing pressure distribution but also the three-dimensional stress state with accuracy. A new fatigue criterion for multi-axial out-of-phase stress was proposed by using mean stress tensor and alternating stress tensor of complex number in this study. This criterion was developed to improve the classical multi-axial “yield criteria”. This criterion is simple, comprehensive and suitable for the evaluation of three-dimensional FEM results. The connecting rods exhibiting high reliability under severe conditions were investigated through the stress analysis and the new evaluation criterion.
Technical Paper

Development and Current Status of the New CAD System “SCADEM-2”

The CAD/CAM system, named “SCADEM-2”, in Suzuki Motor Co., Ltd. Motorcycle Engineering Division was developed, based on the old system “SCADEM”. 3D CAD/CAM system “SCADEM-2” is more accessible for operating, more speedy for processing and more complete for generating figures than the old system. Since this system opened in 1987, has been popularly used by most designers of Motorcycle Engineering Division. It's main functions are Design (3D), Drafting (2D), Electrical Schematic, and FEM Processing.