Corrosion fatigue evaluation method considering environmental corrosion and continuum mechanical damage evolution law

• Main Authors: DING YANG, LI ZHONGXIAN, ZONG LIANG, LIU HENG
• Format: Patent
• Language: Chinese; English
• Published: 01.09.2023
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTEDFOR SPECIFIC APPLICATION FIELDS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a corrosion fatigue evaluation method considering environmental corrosion and continuum mechanical damage evolution laws, which comprises the following steps: a) establishing a steel natural atmospheric corrosion degree development function eta (t) according to a corrosion test or an empirical formula; b) calibrating steel continuous medium mechanical damage evolution parameters under different corrosion degrees according to a corrosion fatigue test or an empirical formula, and establishing evolution equations C (eta) and beta (eta); c) processing the standard stress time-history spectrum of the component to obtain a standard stress amplitude sequence; d) updating damage evolution parameters C and beta according to the service time t and the corrosion degree eta, calculating a fatigue damage increment delta D generated by the standard stress amplitude sequence, and circulating until damage; and e) estimating the fatigue life or the fatigue damage degree of the steel members with differ