Abstract

This document is a experimental study on fatigue life of brace mounting weld joint. A brace is used to put sub-frame together on the main frame with high strength bolts. It has low fatigue life so a patch is in need for improving a fatigue characteristics of welded joint in brace mounting This paper presents the most pertinent patch size for truck. For this, a critical stress is computed at the point of fatigue crack occurred on truck frame by finite Element Analysis. Using by this critical stress. Designers are able to determin whether fatigue crack is occurred and are able to select a pertinent patch type. And then, with a selected patch type, structural joint stiffness was estimated to compare to the conventional and other patch type or brace mounting Finally, fatigue test were performed to prove a suitability of selected prototype compare with the conventional and other patch type or brace mounting.

Keywords

• fatigue life;
• joint;
• brace;
• sub-frame;
• min frame;
• critical stress;
• fatigue crack;
• patch;
• Finite Element Analysis;
• joint stiffness

• 피로수명;
• 결합부;
• 브레이스;
• 서브 프레임;
• 프레임;
• 임계응력;
• 피로크랙;
• 보강판;
• 유한요소해석;
• 결합부 강성;