Tính toán tuổi thọ mỏi trong kết cấu thép hàn

Abstract

Fatigue life is a key concern in welded-steel frames for mobile equipment that experience large and varying dynamic loads. There are more 90% of all failures in engineering components are due to fatigue. Therefore, heading off potential fatigue issues is always beneficial, both for manufacturers and users. For engineers who design welded-steel structures subject to dynamic loading, fatigue life is normally a top priority. Whether welding together a few relatively simple parts or fabricating large, complex structures, weld fatigue is likely to be the most-common failure mode if the part or structure is subjected to fluctuating stresses. Each type of steels is fatigue strength and fatigue life different. Here are some basic principles and methods for predicting the durability of welded structures that bear fluctuating loads.