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The Effect of Compressive Residual Stress according to Corrosion Fatigue Life of Automobile Suspension Material  

Ki, Woo-Tae (Department of Mechanical Engineering, Pukyoung National University)
Park, Sung-Mo (Department of Computer Engineering, Pukyoung National University)
Moon, Kwang-Seok (Department of Electronics Engineering, Pukyoung National University)
Park, Kyeong-Dong (Department of Mechanical Engineering, Pukyoung National University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.16, no.5, 2008 , pp. 1-7 More about this Journal
Abstract
A study of new materials that are light-weight, high in strength has become vital to the machinery of auto industries. But then, there are a lot of problems with developing such materials that require expensive tools, and a great deal of time and effort. Therefore, the improvement of fatigue strength and fatigue life are mainly focused on by adopting residual stress. And Influence of corrosive condition for corrosion fatigue crack was investigated, after immersing in 3.5%NaCl, $10%HNO_3$+3.5%HF, $6%FeCl_3$. The immersion period was performed for 365days. The compressive residual stress was imposed on the surface according to each shot velocity based on shot peening, which is the method of improving fatigue life and strength. Fatigue life shows more improvement in the shot peened material than in the un peened material in corrosion conditions. The threshold stress intensity factor range was decreased in corrosion environments over ambient. Compressive residual stress of surface on the Shot-peen processed operate resistance force of fatigue crack propagation. The fatigue crack growth rate of the Shot-peened material was lower than that of the un peened material. Also m, fatigue crack growth exponent and number of cycle of the shot peened material was higher than that of the un peened material. That is concluded from effect of da/dN.
Keywords
Compressive residual stress; Shot peening; Fatugue life; Fatigue crack growth rate; Threshold stress intensity factor;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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